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  #121  
Old November 10th, 2012, 08:36 AM
mixin mixin is offline
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

Just a few of the recent updates:

From Texas Brine
November 7, 2012
The Observation Well was opened this morning for several hours during
which 68 barrels of liquid hydrocarbon were removed from brine cavern #3.

Flaring of natural gas from the shallow aquifer relief well continues on a 24-hour basis. Between 12:00 noon on Monday and 7:00 a.m. this morning, slightly more than 70,000 cubic feet of natural gas has been vented from the well and safely flared at the surface.

November 8, 2012
As of 8:00 a.m. today, just over 100,000 cubic feet of natural gas
has been vented from aquifer and safely flared at the surface.

November 9, 2012
1. The Observation Well was opened this morning for two hours during which approximately 60 barrels (or 2,520 gallons) of liquid hydrocarbon were displaced from cavern #3 to the surface.

Results from yesterday’s measurement of the total depth of the cavern revealed that the cavern floor has risen another four feet since last measured on November 1. The next total depth measurement will occur next Thursday, November 15.

2. Only a small amount of hydrocarbon remains to be removed from the surface of the sinkhole. The surface will be carefully monitored to see if any additional oily material accumulates. Skimming of the small amount of liquid hydrocarbon material observed in the tree-filled swampy area bordering the sinkhole continued today.

3. Between 8:00 a.m. yesterday and 8:00 a.m. this morning, another 34,000 cubic feet of natural gas was vented from the shallow aquifer relief well and safely flared at the surface. The venting and flaring continues 24 hours a day.

**************

The latest Assumption Parish Summary had a few changes/additions:
As of Nov 8:
* Parish Emergency Declared – 19 June 2012...Extended 30 days on 9 November, 2012
* Texas Brine Collected a total of 4332.6 bbls(cumulative total as of 8 November 2012) of hydrocarbons from the Oxy 3A Cavern and flared a total of 544 mcf of metered gas(cumulative total as of 8 November 2012)
* Air Monitoring Sample Data
–1 letter (dated 10/18/2012) was released to the parish during this operational period for community ambient air and air at bubble sites sampled 9/28/2012-10/14/2012 (MultiRAE). Findings-It does not appear that chemical exposure of site-related contaminants poses a public health risk to individuals in the immediate area of Bayou Corne for the time period and chemicals sampled.
–1 letter (dated 10/18/2012) was released to the parish during this operational period for residential ambient air sampled 9/28/2012-10/13/2012 (MultiRAE); Findings-It does not appear that chemical exposure of site-related contaminants poses a public health risk to individuals in the immediate area of Bayou Corne for the time period and chemicals sampled.
–1 letter (dated 10/18/2012) was released to the parish during this operational period for air samples collected 9/26/2012 and 10/2/2012 (isotopic analysis); Findings-This data is meant to characterize the gas in the bubbles and wells sampled. These type of analyses do not provide data that could be used for assessing public health.
* Industrial Water Well Sampling Data
–1 letter (dated 10/18/2012) was released to the parish during this operational period for industrial wells sampled on 9/26/2012. Findings-DHH recommends immediate remediation of industrial water wells with high levels of methane.
* Safe Drinking Water
–1 letter (dated 10/18/2012) was released to the parish during this operational period for two privately-owned water wells sampled on 9/26/2012. Findings-DHH recommends property owners routinely monitor for the presence of methane in the tested water wells.
* As of 06 November, Texas Brine has removed 123 roll off boxes hydrocarbon contaminated debris.
* As of 06 November, Texas Brine has removed approximately 1535 Barrels of hydrocarbons from the surface of the sinkhole.
* Pursant to the DNR press release dated 11/7/2012 regarding the pressure in some geoprobes, LDEQ will conduct indoor air monitoring as requested at residential homes in the Bayou Corne community.

**************

New flyover pictures were also posted on Nov 8
http://www.flickr.com/photos/assumptionoep/

As well as a brief flyover video
http://www.youtube.com/watch?v=HJon8e-fEtg&feature=plcp

A screen cap for those who can't see the video

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  #122  
Old November 12th, 2012, 06:05 AM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

Even though DNR thinks this well is too far from the sinkhole to affect it, evacuees are worried since that blowout happened just a couple of years ago and some evacuees from Bayou Corne are currently living near the new well site.

http://theadvocate.com/home/4388957-...till-producing
Quote:
Facilities around sinkhole allowed to continue operations

By David J. Mitchell
River Parishes bureau
November 12, 2012
0 Comments

BRULE ST. MARTIN — Five miles as the crow flies from the Bayou Corne-area sinkhole near La. 1000, Petrodome Operating LLC is drilling for oil deep underground.

Petrodome is backed by an Australian company, Grand Gulf Energy Ltd., that has a trove of proprietary seismic data allowing the company and its partners to plumb strata a few miles off the Napoleonville Dome for oil and gas finds others have not tapped, company news releases and well records show...
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  #123  
Old November 12th, 2012, 07:13 PM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

11:50 a.m. Update
November 12, 2012
Observation Well #2 has been re-perforated and there is pressure present. A flare stack will be installed and we will update accordingly.

Also, we’ve been informed that 3 trees that were standing where the last slough in occurred, have fallen into the sinkhole.

********************
News Release

Office of Conservation Orders Texas Brine to Take Further Steps to Protect Public Safety
For Immediate Release
Monday, Nov. 12, 2012
Contact: Phyllis Darensbourg, 225.342.0058

Office of Conservation Orders Texas Brine to Take Further Steps to Protect Public Safety
Directive specifies network of observation/vent wells, monitoring wells, subsidence benchmarks and home monitoring

BATON ROUGE – Louisiana Commissioner of Conservation James Welsh today ordered Texas Brine LLC to install a network of observation/vent wells, pressure monitoring wells and elevation benchmarks for subsidence monitoring in the Bayou Corne area to ensure the public’s safety. The commissioner also ordered the company to assume responsibility for operating the observation/vent wells already installed by the Office of Conservation’s contracted agent, Shaw Environmental and Infrastructure, and to provide containment around the sinkhole area to prevent any release of oil into nearby waterways.

The new orders under the existing Declaration of Emergency and Directive also specifically require Texas Brine to install in-home monitors to detect possible natural gas accumulations and to upgrade home ventilation for all slab-foundation buildings within the Bayou Corne evacuation area established by Assumption Parish. These additional orders are needed because of the potential for methane accumulation connected to the failure of Texas Brine’s nearby brine mining cavern.

Though Texas Brine is being ordered to assume responsibility for operating and installing the networks of wells and monitoring equipment, Welsh said, the actions taken must meet the specifications and requirements of the Office of Conservation’s oversight of the response to the sinkhole and ongoing presence of natural gas in and above the aquifer. These events are connected to the failure of Texas Brine’s abandoned brine cavern on the western side of the Napoleonville Salt Dome.

Welsh said the additional requirements are based on analysis by the Office of Conservation and expert consultants with the Office’s contracted agent, Shaw Environmental and Infrastructure, of underground conditions in the area above the top of the ground water aquifer, where natural gas pressure has been detected. Though past monitoring of slab-based structures in the area have shown no accumulation of natural gas in homes, Welsh said that all necessary steps must be taken to detect, minimize or prevent any such accumulation from occurring.

“The steps outlined in this directive will give us an added layer of protection in ensuring public safety and move the response effort closer to bringing the lives of the residents of the Bayou Corne area back to normal,” Welsh said. “They are designed to provide three lines of defense – ongoing removal of natural gas from the aquifer and underground in and around the community; use of ventilation as a preventative measure against potential natural gas accumulation in homes; and because we cannot take public safety for granted, constant monitoring for any possible natural gas accumulation in those structures.”

Welsh noted that his order will not alter the ongoing cooperative effort between the Office of Conservation and the state Department of Environmental Quality (DEQ) to run an additional round of in-home testing for methane accumulation in slab-built structures in the area to determine current conditions.

http://assumptionla.wordpress.com/
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  #124  
Old November 14th, 2012, 07:22 PM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

Updates from the parish blog

We have been informed by Entergy that due to required repairs on their Napoleonville substation, they have scheduled a planned electricity outage tonight at Midnight. The outage is scheduled to last 2-3 hours.

The affected areas include:
Highway 1, from Assumption Parish Waterworks to Paincourtville (including Highway 401 “Canal Road”)
Highway 308, from the Napoleonville Bridge (@ traffic signal) to Plattenville.

We encourage you to spread the word to friends and neighbors.

******************

The Nov 14 resident briefing videos (12 of them) have been posted at YouTube, as well as 2 flyover videos
http://www.youtube.com/user/assumptionla?feature=mhee


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  #125  
Old November 16th, 2012, 06:38 PM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

KLFY has a 3-part video series from early this month about the Bayou Corne disaster here:

http://www.klfy.com/story/19990672/assumption-sinkhole

The 3rd part has an interview with 2 internationally known earth scientists at University of Louisiana/Lafayette that basically confirms the unprecedented nature of what has happened and the uncertainties involved.

The Shaw group made another presentation to the public on 11/13:

http://www.edsuite.com/proposals/pro...ion_fi_523.pdf

One of the topics covered is the ongoing flaring of accumulated gas:


Quote:
Vent Well Data
•Flowing at 15-30 Thousand Ft3/Day
•Formation pressures
–Between 50 & 90 psi
–Slightly greater than water pressure at these depths and less than rock/soil pressure (frac pressure)
•Total column of gas in aquifer between 5 and 30 feet (at ORW-04, 95-128’)
Also their slides indicate that the central sinkhole bubbling remains choked off and the ramifications of that are unknown:

Quote:
Sinkhole Status
•Area of sinkhole—8 acres as of first November
•Gradual subsidence noted outside of sinkhole to the west
•Large bubble plume has disappeared
–May indicate gas is being depleted
–May indicate gas is accumulating in collapse zone
One hopeful impression I got is that the cavern may be reaching stability. On the other hand, the issue of flow from the deeper strata via the frac-out channel caused by the cavern collapse is still a major concern:

Quote:
Ultimate Resolution of Methane Gas Problem
•Unprecedented problem
–Complexity
–Scope
•Vent well effectiveness being assessed
•Large area of gas accumulation
•Ongoing evaluations of viable options including reservoir size and geology
•Intercept Big Hum gas—very difficult
–200+ foot interval with multiple production horizons
–Very difficult to determine gas production horizons
–Other horizons may be flowing into collapse zone
Much more information at the link, including maps and graphics.
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Last edited by Emily; November 20th, 2012 at 03:19 AM. Reason: Typo fix.
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  #126  
Old November 18th, 2012, 03:24 PM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

Here is a list of graphs and charts from the presentation in case we want to find them again:

Vent well locations
Shallow geology (showing layers of clay, sand, etc)
Data locations
Geoprobes
Shallow gas area
a) monitoring locations
b) base of clay elevation
Conceptual shallow gas model
Potential gas migration into homes
Estimated area of maximum subsidence
Sinkhole changes over time
Sinkhole cross-sections
Conceptual model of cavern
Top of salt and overhang (includes data from 2001)
Pre-collapse 3-D Model of Big Hum, dome, cavern, sinkhole
Cavern fluid recovery
Cavern gas flared
Cavern fluid recovery slowing
Cavern pressure data lower
Cavern fill-in rate

I think these are good for future referencing

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The residents really had a lot of concerns at the briefing; mostly about the monitoring of gas and health issues. And, of course, when they will be able to go home again.

When asked about the time-frame for folks to be able to go back home, Dr. Hecox, with the Shaw Group, said it would not be "weeks" but other than that, he wouldn't speculate. He has said a number of times that will will be a long term situation.

He also couldn't explain from a gas-flow geology why the gas bubbling was occurring in the area NE of Grand Bayou. That gas has the same fingerprint as the other gas, so he assumed it was from the same source and it may very well be following the path of least resistance.

It's being strongly urged that the homes that are built on slabs should have 24 hour/365 days monitoring.

They have brought the internationally-recognized group, Itasca, to try to get some answers to the unknowns. The void along the salt dome is a concern due to the possibility of gas accumulating in those pockets and that will be just one of the issues Itasca will be addressing.

Hecox talked about the pressure in the cavern going down. It stayed at 270 for a long time and then dropped to 180 (and holding). They don't know why but speculate that the filling of the cavern has slowed and is not putting so much pressure on the brine. There is about 600' left of the cavern to fill in.

The residents requested that a toxicologist be present at the next meeting to discuss the long-term effects of breathing the bad air. They would also like "long-term" to be better defined.
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  #127  
Old November 20th, 2012, 07:58 AM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

In the latest Assumption Parish update dated Nov 16, there was the following comment:

Quote:
Following recent reports of seismic activity on the western side of the Napoleonville Salt Dome, the Office of Conservation asked Dr. Stephen Horton, Research Scientist CERI, with University of Memphis. Dr, Horton said :
•Small tremors were observed on 11, 12, and 15 November. The preliminary location of the 12 November event is just east of Oxy # 3 with an estimated depth around 400 m (~1300ft) although the uncertainty in the depth estimate is large. This is the same general area where events were observed in July and August. The concern level remains relatively low because of the modest seismicity rate with events occurring in the same general source area. Very long period (VLP) signals continue to occur within the local seismic network. These VLP signals have been prominent on helicorder displays during the last week. We are still investigating the cause of the VLP signals.
Looking at the helicorders this morning, there was a reading at about 10 p.m. last night that I haven't seen since I've been watching. Notice down toward the bottom, the red and green bands of activity. None of the other helicorders picked up on that. I wish we had seismologist who could explain some of these readings.

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This is from Nov 15; I wonder if the bands in the upper half are the VLP signals they are talking about.

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I drew a red line at the approximate depth where that activity, as well as the Oct 23 event @ 1600 ft., occurred.

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  #128  
Old November 21st, 2012, 10:12 AM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

Assumption Parish update:
http://assumptionla.wordpress.com/

November 20, 2012
Texas Brine has reported high levels of H2S from their sonic vent well that is drilled into the cap rock. The well was shut in due to these levels. DNR’s contractor, The Shaw Group, is currently investigating. We are currently waiting on additional details from DNR.

Please be advised that H2S is an extremely dangerous gas. Unlike methane, it is heavier than air and collects at low to the ground levels. No community air monitors have detected H2S. Monitoring will continue as usual.

Additional Information:
Office of Conservation-
Texas Brine’s second vent well (drilled and perforated near the top of the Napoleonville Salt Dome cap rock, much deeper than the shallower aquifer vent wells constructed in the area), encountered hydrogen sulfide gas as venting operations were initiated. Air monitoring detected the hydrogen sulfide gas during venting/flaring operations, and Texas Brine shut the well in to prevent any potential for release. The Office of Conservation concurred with that action to ensure safety of the public and workers on the site. Texas Brine has also established a safety perimeter around the well, including use of barricades and gas monitors, under the oversight of Conservation staff on site. Hydrogen sulfide does sometimes occur naturally in the cap rock of salt domes, and while the cap rock of the Napoleonville Salt Dome does underlie the Texas Brine facility, it does not extend to the Bayou Corne community. Additionally, ongoing daily environmental safety testing in the Bayou Corne community by DEQ has included tests for hydrogen sulfide, and it has not been detected in the community to date. Additionally, DEQ took an extra round of samples today and will continue to monitor the community. The Office of Conservation will be meeting with Texas Brine representatives to further assess the next steps to be taken with the well.

*******************

And a corresponding story from the Advocate:

Hydrogen sulfide gas found in sinkhole-area vent well
BY DAVID J. MITCHELL

River Parish bureau
November 21, 2012
...
Cranch said workers had completed hooking up flaring equipment to the vent well in question earlier Monday and had only recently begun burning off methane when the hydrogen sulfide was found.

He said the gas was released from equipment that separates impurities from methane coming out of the well before it reaches the flare.

The separator releases what it collects every two minutes, Cranch said.

“When they smelled that from the separator, they shut it down,” Cranch said.
...
Patrick Courreges, spokesman for the Louisiana Department of Natural Resources, said officials believe any risk of hydrogen sulfide coming from the other five vent wells — three of which are flaring methane continuously — is very low because they are shallower compared to the other well.
..
http://theadvocate.com/home/4485248-...fide-gas-found
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  #129  
Old November 24th, 2012, 03:46 AM
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http://www.wbrz.com/news/officials-m...near-sinkhole/
Quote:
Officials monitoring for more hydrogen sulfide near sinkhole

Posted: Nov 21, 2012 6:26 PM by Adrian Pittman
Updated: Nov 21, 2012 6:26 PM
Officials monitoring for more hydrogen sulfide near sinkhole
BAYOU CORNE - The fear and anxiety intensifies near Bayou Corne after a poisonous and flammable gas was found in a relief well...

""We are tired of Texas Brine determining what's relevant, what is not relevant, what's dangerous and what's not dangerous, and give us information when they feel it's appropriate." says Assumption Parish President, Marty Triche."
http://www.fox44.com/news/bayou-corn...oxic-gas-found
Quote:
Bayou Corne community outraged with lack of warning of toxic gas found
Kris Cusanza Reporter
Wednesday, November 21, 2012 - 5:33pm

BAYOU CORNE,LA (FOX44) — Assumption Parish emergency officials are outraged after they say Texas Brine failed to tell them that toxic gas was found near the sinkhole. Officials say it took Texas Brine almost 24 hours before the company told them about the discovery.
[snip]
Emergency officials say Texas Brine did not do its job to warn officials.

"It should not occur," John Boudreaux, Assumption Parish Office of Emergency Prepardness, said. "It should be immediate notification of something this serious to all these agencies. They have a legal responsibility to do something. It's in state law to make an immediate notification when you are dealing with an extremely hazardous substance."...
There's another video with interviews with residents at the FOX link.

Maybe the state should set up 24 hr monitoring for H2S if Texas Brine is not going to alert them to releases.

http://www.onepetro.org/mslib/servle...ew?id=00071439
Quote:
Publisher Society of Petroleum Engineers Language English
Document ID 71439-MS DOI More information 10.2118/71439-MS
Content Type Conference Paper
Title Health, Safety and Environment Impact Assessment for Onshore Sour Gas Wells
Authors C. Rezaei, M.M.K. Al Mehairy, A. Al Marzooqi, ADCO
Source

SPE Annual Technical Conference and Exhibition, 30 September-3 October 2001, New Orleans, Louisiana
ISBN 978-1-55563-154-3
Copyright 2001. Society of Petroleum Engineers
Preview

Abstract

It is recognised that the drilling of high sour gas wells entails higher risk to workers, more complex drilling procedures and potentially higher concequences should a well failure occur. The sour gas well studied is known to contain 36% vol/vol of H2S which in the event of a blowout could have a significant impact. Concentrations capable of causing health difficulties could occur over 30 kms from the wellsite. Sour wells with high H 2S release potential or those near dwellings require site specific emergency response plans. In case of a significant release of H2S, the health & safety of the public will be protected either by their evacuation or ignition of the well. At night, with stable conditions, the dispersion distances may be increased by a factor of 10.
[snip]
HSE Impact Assessment

Hydrogen Sulphide

Hydrogen sulphide (H 2S) is a highly toxic, colorless, flammable gas. The major hazard of H2S is its ability to cause sudden death due to accidental exposure.

Threshold Limit Value - Short Term Exposure Limit (TLV-STEL) of H2S is 15 ppm (21 mg/m3) for 15 minutes. This is the concentration to which workers can be exposed continuously for a short period of time without suffering from irritation, chronic or irreversible tissue damage or accidental injury.
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  #130  
Old November 24th, 2012, 07:22 AM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

Here is the most recent update from Assumption Parish:

Status of Hydrogen Sulfide in Bayou Corne Area

Prepared by Gary R. Hecox, Ph.D., Shaw Environmental & Infrastructure, Inc.

Shaw Environmental & Infrastructure, Inc. (Shaw) has reviewed existing data and is currently collecting new data to evaluate the conditions related to the hydrogen sulfide observed in the Texas Brine Relief Well #2 completed in the cap rock. At all times, protection of local residents and project staff is and will remain the top priority when making decisions and recommendations for response activities related to site conditions.

Currently there are five vent wells completed in the alluvial aquifer and one, Relief Well #2, completed in the cap rock. Four of the vent wells have positive wellhead pressure indicating gas accumulation; the fifth well has no wellhead pressure.

Acting out of an abundance of caution to the potentially changing conditions when notified about the detection of hydrogen sulfide gas on Tuesday November 20, 2012, Shaw shut down flaring operations on the two ORW vent wells currently being flared. This was done to allow for collection of quantitative hydrogen sulfide data and develop the appropriate plan and monitoring measures to safely go forward with flaring operations. ORW-2 has since resumed flaring and Texas Brine Relief Well #1 remained flaring. Flaring operations are being monitored for hydrogen sulfide by the local ambient air monitors and site personnel.

DNR and Shaw have discussed with Texas Brine what occurred at the Relief Well #2. The geophysical log on Relief Well #2 showed gas accumulation from 142 to 150 feet in the alluvial aquifer immediately below the base of the overlying clay and from 424 to 432 feet in the cap rock on top of the salt of the Napoleonville dome. On November 15, 2012 this well was perforated in the cap rock at depths of 424 to 427 feet and 455 to 457 feet. The gas accumulation zone in the alluvial aquifer was not perforated. On Monday November 19, 2012, Texas Brine set up the flare on this well and started flaring gas from the cap rock. Venting and flaring continued until late in the day when water started to be produced from the well. Texas Brine set up a gas/water separator and restarted flaring operations. After a very short period of flaring, site personnel noticed hydrogen sulfide odors from the water being discharged from the separator. At this time, one of the AreaRae monitors was used to check for hydrogen sulfide gas. When hydrogen sulfide was confirmed, Texas Brine stopped flaring operations, shut-in and locked the wells, and set a safety perimeter. The well currently remains shut-in and locked.

Shaw has checked the ORW vent wells for hydrogen sulfide. In the two wells being flared, no detectable hydrogen sulfide concentrations were measured in the gas. Low concentrations of hydrogen sulfide, consistent with a swamp environment, were measured in the two ORW wells that have not been flared. Shaw is checked all 18 of the shallow Geoprobe wells for hydrogen sulfide. All of these shallow wells were nondetect for hydrogen sulfide.

At this point in time, it appears that the hydrogen sulfide produced by Relief Well #2 was only from the cap rock and not the alluvial aquifer vent wells. While low concentrations of hydrogen sulfide have been detected at some of the bubble sites, the concentrations are well below those that would pose a human health risk. Other than Relief Well #2, all hydrogen sulfide concentrations measured are consistent with the production of hydrogen sulfide caused by decay of trees and other vegetation in a swamp environment.

********************

Here is a link to the letter from Commissioner of Conservation Jim Welsh to Texas Brine LLC on the steps taken in response to the detection of hydrogen sulfide in the company’s second vent well and instructions for further action.

*********************

This is the latest statement on the recent seismic activity

Analysis from Itasca Group on recent seismic monitoring that can be posted to Assumption blog to give information to public on latest evaluation –

Dr. Will Pettitt, Principal Geophysicist at Itasca Consulting Group, has reviewed the seismic data recorded overnight on November 20/21. Long-period seismic tremors and micro-earthquakes have been observed, similar to those defined previously by Dr. Steve Horton of CERI/USGS, and recorded mainly on station LA08 closest to the sinkhole. The long-period seismic tremors are postulated to be caused by gas and/or fluid movements through the rock collapse zone below the sinkhole on the edge of the salt dome. Micro-earthquakes of this nature are typically associated with small-scale rock movements, and again are believed to be occurring in the collapse zone. The source of both of these event types continues to be investigated by experts.
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Old November 27th, 2012, 05:06 PM
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http://assumptionla.wordpress.com/20...inkhole-event/
Quote:
2:55 p.m. Sinkhole Event
November 27, 2012 //

An event occurred at the sinkhole around 11:30 pm today which is being considered as a “burp”. Vegetative debris and hydrocarbons came up from below the sinkhole. A few trees in the southwest corner did fall in however most of the debris came from below the sinkhole. Texas Brine removed all crews from the sinkhole and is checking the boom surrounding the area to make sure everything is in tact...
Video showing aftermath:
http://www.youtube.com/watch?v=5-N1P8dSCMM
Screen capture:


This might be the event that the increased seismic activity heralded, particularly the long period tremors. I'm glad no workers were injured. Volcano scientists learned the hard way that long period tremors can be a warning of pressure building underground.
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Old November 29th, 2012, 03:06 AM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

This sounds like there was some sort of plunger-like force created in the sinkhole during the recent 'burp.'

http://theadvocate.com/home/4538683-...n-hydrocarbons
Quote:
Assumption sinkhole “burps” vegetation, hydrocarbons
david j. mitchell
River Parishes bureau
November 28, 2012
[snip]
Cranch said the mix of debris, dirt and emulsified oil that surfaced and broke apart Tuesday appeared to have originated from the sinkhole’s bottom.

“The point being, it’s not a belch of just crude oil,” Cranch said.

Boudreaux said before the sinkhole disgorged the material, the water level dropped by about 6 inches and then returned to its original level. The size of the water level change was based on measurements of hydrocarbon rings left on trees...
http://assumptionla.wordpress.com/20...-field-update/
Quote:
8:25 p.m. Bayou Corne Field Update
November 27, 2012

[snip]
Sinkhole Site –
Settling/shifting of material underlying sinkhole created disturbance of water in sinkhole in morning roughly coinciding with USGS report of observance of seismic activity – crude oil emulsion and woody debris from sinkhole bottom observed rising to surface, water from nearby swamp seen flowing into sinkhole. Surface activity observed for several minutes before water calmed again.
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  #133  
Old November 29th, 2012, 07:29 PM
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http://theadvocate.com/news/4547791-...not-reportable
Quote:
Police: Gas release not reportable
BY DAVID J. MITCHELL
River Parishes bureau

November 29, 2012
2 Comments

The atmospheric release of hydrogen sulfide gas last week from a Texas Brine Co. LLC vent well in Assumption Parish did not require immediate reporting to state hazardous materials authorities, Louisiana State Police said.

Capt. Doug Cain, State Police spokesman, said the release of the gas, which is flammable and poisonous at high concentrations, did not go off the company’s site and did not trip community air monitors.

“As far as we’re concerned, it was not even a hazardous materials incident,” Cain said in a telephone interview this week...
How did police determine if H2S crossed a property boundary? The article below totally contradicts the belief that the gas respected property boundaries and implies that Texas Brine believed that the gas was breathed in by Bayou Corne residents:

http://www.wafb.com/story/20161632/d...siana-sinkhole
Quote:
DEQ monitors air at homes near giant Louisiana sinkhole
Posted: Nov 21, 2012 3:10 PM PST Updated: Nov 22, 2012 11:24 AM PST
By Cheryl Mercedes

BAYOU CORNE, LA (WAFB) -

Flaring at the Bayou Corne sinkhole site has stopped indefinitely at one well site. Texas Brine, the company that owns the property, submitted a proposal to the state Wednesday afternoon asking permission to cap one well for good after dangerous gases were detected.

Henry Welch, a resident, said he smelled a rotten egg odor outside his home in Bayou Corne on Monday. Texas Brine later confirmed it was hydrogen sulfide gas found in a vent well near the now eight-acre sinkhole. ...
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Last edited by Emily; November 29th, 2012 at 07:34 PM. Reason: Clarified sentence structure.
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  #134  
Old December 2nd, 2012, 08:10 PM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

Another one of those "burps" occurred earlier that week. Texas Brine reported it in their Nov 21 update:

Quote:
2. Debris, apparently from the bottom of the sinkhole, rose to the surface accompanied by a brief period of water movement. That debris is being cleared from the surface. There have been no other observable changes to the sinkhole shape or size.
In the Nov 30 update, TB noted:
Quote:
A total depth measurement taken yesterday revealed that the floor of the cavern has risen 11 feet since last measured on November 15. The depth is now 4,231 feet beneath the surface.
*******************

From the Assumption Parish, TB is also getting a fine:

For Immediate Release

Saturday, Dec. 1, 2012

Office of Conservation Fines Texas Brine $100,000 for Failure to Comply With Directives Company may face further penalties and fines for failure to act immediately on Conservation orders

BATON ROUGE – Louisiana Commissioner of Conservation James Welsh announced today that his Office has fined Texas Brine LLC $100,000 for failure to comply with several of the orders included in his November 12 directive to the company.

Welsh on Nov. 12 gave Texas Brine new instructions in an amendment to the already existing Declaration of Emergency and Directive, intended to further the ongoing efforts to protect public safety and the environment in the area, abate the impacts of natural gas that migrated to the aquifer due to the failure of Texas Brine’s cavern, and prevent the release of crude oil from the sinkhole created when the company’s cavern wall collapsed.

Texas Brine has been assessed civil penalties of:

· $80,000 for failure to initiate installation of a containment system around the sinkhole to further prevent release of contaminants into nearby waterways by Nov. 16

· $10,000 for failure to install in-home monitors to detect possible natural gas accumulations and upgraded home ventilation for all slab-foundation immediately upon gaining permission from property owners

· $10,000 for failure to begin installation of two new observation/vent wells by Nov. 27

“We cannot and will not tolerate delays or excuses in the effort to protect public safety and the environment, especially when the people of Bayou Corne still cannot feel comfortable returning to their own homes,” Welsh said. “Texas Brine needs to accept its civic responsibility, react quickly and act with urgency to protect the citizens and environment of the Bayou Corne area. We will not stand unwarranted delays in the effort to return the lives of the people of this community to normal.”

Welsh’s notice to Texas Brine on the fines requires immediate payment of the civil penalties and compliance with all provisions of the Nov. 12 directive, and includes the warning that additional actions, including further fines, can be taken if the company continues its failure to comply with the Office of Conservation’s directions.
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  #135  
Old December 4th, 2012, 07:22 PM
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http://news.yahoo.com/company-fined-...--finance.html
Quote:
Company fined over sinkhole says it's trying
Associated Press – Mon, Dec 3, 2012

BATON ROUGE, La. (AP) — Owners of a failed brine storage cavern are doing their best to comply with a state order to quickly resolve problems created by an eight-acre sinkhole in Assumption Parish, spokesman Sonny Cranch said Sunday.

He said Texas Brine Co. lawyers will review a $100,000 fine imposed Saturday by state Conservation Commissioner James Welsh, who said the company hasn't complied with his Nov. 12 order to speed work.

"We are working as fast as we can to comply with the order," Cranch said in a phone interview.
[snip]
Cranch said figuring out how to permanently block the sinkhole from other waterways is complex in a swamp, especially since officials don't yet know how big the sinkhole will get. In the meantime, crews move the boom constantly and skimming continues to make sure oil doesn't get into any waterways, he said.

"It is being controlled," Cranch said...
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  #136  
Old December 6th, 2012, 07:00 PM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

H2S gas is coming up from the cavern itself now through the exploration/extraction well Texas Brine put in. They say no gas was released into the air and they're looking into installing a scrubber.

http://theadvocate.com/home/4616542-...ed-at-sinkhole
Dangerous gas discovered at sinkhole Thursday
River Parishes bureau
December 06, 2012


There's some news about diminished gas flow from the flaring vents that is either a good sign, or a bad sign - according to Texas Brine.
http://theadvocate.com/home/4609825-...khole-gas-flow
Texas Brine: Sinkhole gas flow diminishing
By DAVID J. MITCHELL
River Parishes bureau
December 06, 2012


What if a layer of H2S is forming in the Sinkhole lake and it 'burps' again?
http://www.pbs.org/wnet/savageplanet.../indexmid.html


Also some disturbing news from the Advocate about shallow gas being found in the community:
Quote:
While response efforts move along, methane fears affect daily life.

On Monday, Assumption Parish school officials redirected a bus route from an evacuated Bayou Corne neighborhood after a shallow well known as a Geoprobe hit gas at a depth of 30 feet below residential property on Crawfish Stew Street, school and parish officials said.

School Superintendent Earl “Tibby” Martinez said that when word of the gas find got out, the bus driver became concerned about driving through the neighborhood with 34 Assumption High School students on board.

Children and Texas oil drillers aren't a good combo:
http://learningenglish.voanews.com/c...06/611155.html
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Last edited by Emily; December 6th, 2012 at 07:02 PM. Reason: Typo fix.
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  #137  
Old December 18th, 2012, 05:15 AM
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http://theadvocate.com/news/4685215-...ailure-factors
Quote:
Geologist details failure factors
Company officials reject explanation of sinkhole’s formation

BY DAVID J. MITCHELL
River Parishes bureau
December 16, 2012

The sidewall of a Texas Brine Co. LLC salt cavern inside the Napoleonville Dome was dissolved through the dome’s outer edge, bringing the cavern into contact with surrounding sediment layers outside the dome before the cavern failed, an LSU geologist said Friday.

The assessment by Jeffrey Nunn, Ernest and Alice Neal professor of geology and geophysics and Pereboom professor of science, was a step beyond what other officials and scientists working on the sinkhole response have presented in public meetings and appeared to more closely lay the blame with Texas Brine, which mined the cavern by dissolving the salt...
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  #138  
Old December 19th, 2012, 07:34 PM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

I was searching for any past incidents of salt dome sheath breaches by brine cavern mining, and found what might be a reference from 1997 to the same cavern that's in trouble currently near Bayou Corne. I believe it is the westernmost cavern on the Napoleonville dome.

Here's the snippet from the text of an article that refers to a 'Fig. 8":

__________________________________________________ _______________________________________

__________________________________________________ _______________________________________


Here's another snippet referring to "Fig. 8":
__________________________________________________ _______________________________________



__________________________________________________ _______________________________________

This is the article the snippets are from - a $40 access fee is way too rich for me, though.

http://link.springer.com/article/10....050115?LI=true
Quote:
Environmental Geology
February 1997, Volume 29, Issue 3-4, pp 165-175
Geologic site characterization (GSC) principles derived from storage and mining projects in salt, with application to environmental surety

J. T. Neal,
T. R. Magorian

Abstract

 The source of many environmental incidents involving engineering works has been traced to inadequate geologic site characterization (GSC). Even though critics may argue that hindsight is almost always clearer than foresight, what is reasonable to some geologists may be overkill to others and GSC is often underperformed. Communication between designers, geologists, engineers, and regulators is paramount at all stages of a project, each recognizing the essential needs of the other. For large projects having substantial longevity, it is essential to periodically review initial conclusions because assumptions and criteria change as the geosciences evolve, engineering precepts are refined, and analytical capabilities increase. A brief consideration of the changing geological paradigms of the 1950s and 1960s as compared with the 1990s should leave little room for debate on this. Geologic site characterization should be a dynamic, continuing process. A balanced approach must be sought, to provide adequate information for safety of operations, neither slighting or overdoing the effort. Several examples are taken from the salt mining and storage industry, which illustrate these principles, but there is widespread application to other geological media and engineering projects. The ultimate benefit of valuing site characterization efforts may be more than just enhanced safety and health – costs not expended in lost facilities and ligation can become profit.
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Last edited by Emily; December 19th, 2012 at 07:42 PM. Reason: Spacing fix for clarification.
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  #139  
Old December 28th, 2012, 10:16 AM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

Sinkhole belches organic material

By Bret H. McCormick
River Parishes bureau
December 28, 2012

The 8.5-acre Assumption Parish sinkhole, located between the Bayou Corne and Grand Bayou communities, burped this week for the second time in a month, the company cleaning up the site reported Thursday.

Sonny Cranch, a spokesman for Texas Brine Co. LLC, said the burp happened either Christmas night or early Wednesday.

He said crews have not been able to determine how much vegetation came up after the burp. The previous burp occurred on Nov. 27.

The burp, Cranch said, is composed “of decayed leaves, branches and some tree trunks. It is very likely material from a slough-off that occurred a few weeks ago.”
...
Unlike the previous burp, which coincided with a long-period earth tremor, this one wasn’t due to a tremor, Cranch said.
...
http://theadvocate.com/home/4779505-...ganic-material

-------------------------------------------------------------------------------

Flyover 12-27-12
http://www.youtube.com/watch?v=t6AlzqncYYE
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  #140  
Old January 8th, 2013, 02:56 AM
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http://theadvocate.com/home/4844113-...e-house-action
Quote:
Petition requests White House action on sinkhole
by robert stewart
Advocate staff writer
January 08, 2013

An online petition created Saturday asks the Obama administration to declare the Assumption Parish sinkhole a federal emergency and assign a federal team of experts to the state to help with relief efforts.

“There is no light at the end of the tunnel for when they can return home, or have any kind of closure from this nightmare,” the petition says of those living in the communities near the sinkhole who were evacuated in August.

“This is not just a hole in the ground, and requires more resources than the state has at their disposal,” the petition says...
http://www.nbc33tv.com/news/your-sto...-residents-dis
Quote:
Bayou Corne residents disheartened by Texas Brine legal battle with the state
Kris Cusanza Reporter
POSTED: Friday, January 4, 2013 - 10:55pm
UPDATED: Friday, January 4, 2013 - 11:17pm
http://theadvocate.com/home/4853364-...le-gas-burning
Quote:
Experts say sinkhole gas burning off slowly
BY DAVID J. MITCHELL
River Parishes bureau
January 08, 2013

One-tenth to one-twentieth of the methane gas estimated to be trapped under the Bayou Corne and Grand Bayou communities in northern Assumption Parish has been burned off so far, according to parish emergency response officials...

Here's a short documentary done in December by a Bayou Corne resident, 'rainbeaudais':

Quote:

rainbeaudais
Published on Dec 11, 2012

First, I apologize for the camera shake.I was in a boat, very nervous, and trying to hurry....

The water level was low as is normal for this time of year, and muddy from a recent heavy rain.

This was my first sight of these methane gas under pressure bubbling sites down the bayou approx 1/2 mile from the homes on the south side of Hwy 70. Nothing I have seen on the news, or on the APPJ flicker photo site prepared me for what I saw going on. I was shocked, and so very heavy hearted after seeing what I saw. It was very chilling, knowing of all the gas under us, but also knowing of the massive (unknown location) voids in the earth.

There was a direct path of water coming from the sinkhole and draining in to the bayou at the pipeline row, and several others, none contained. Texas Brine and the other agencies seem to think that little boom they have at the sinkhole is enough. I disagree. The booms do not stop the saltwater. We saw only one small alligator in about 30 minutes, and lots of dead fish.

If there are this many bubbling sites in the water where they are easily seen, we can only dare to imagine how many are on land, and in the swamps between the sinkhole and the homes west of the sinkhole....that we don't know of.
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Last edited by Emily; March 25th, 2014 at 08:17 PM. Reason: Removed photo link.
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  #141  
Old January 9th, 2013, 03:49 PM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

There was rumbling again in Bayou Corne this past weekend that was attributed to seismic waves passing through the area from the big earthquake off the coast of SE Alaska:
http://www.wafb.com/story/20521963/g...deral-disaster

The parish blog says the waves hit at about 3 am local time on Saturday, Jan. 5th. You can see them clearly on the helicorders - with another distinct pattern at about 7 am local time. One sensor only picked up only the later pattern. To me, that indicates some activity in the area might have been triggered by the waves.

http://folkworm.ceri.memphis.edu/heli_temp/








The parish blog also said:
Quote:
The Office of Conservation has advised Assumption Parish officials of that detection because, though the Alaska quake was too far away to have any effect on subsurface stability in Louisiana, local officials and residents monitoring the seismic recordings should be informed that the readings for that period do not indicate a change in conditions in or near the Napoleonville Salt Dome.
Maybe in this case stability was not affected, but I saw research that does link energy waves to microseismicity during salt cavern collapse. Seismic waves generated by an M∼7.2 earthquake at more than 10000 km from a salt cavern in France are studied. The link below has the whole text of the paper in either HTML or PDF format, but I would read it soon if you are interested, since most links have only the abstract.

Evidence for remotely triggered microearthquakes during salt cavern collapse

I think that one of the key points in that article is that a cavern has to be in a very compromised state already to be affected by seismic waves from distant earthquakes. They are a triggering mechanism, not the cause of the collapse or related seismic activity.

The Bayou Corne bubbling was first officially reported on May 30th of 2012, I believe, but processes related to collapse might have started earlier. There were a couple of unusual earthquakes reported in the Spring of 2012:

The April 11, 2012 Sumatra great earthquake sequence

May 20, 2012 M6.0 thrust earthquake in Italy

Even if the timing is proven to be off on those two, the article on the cavern collapse in France raises the possibility that even Earth tides can induce microearthquakes in unstable systems. I guess the relevant point to Bayou Corne is that the research article and the way the Alaska earthquake affected the failed cavern there supports that any seismicity related to the cavern collapse there was caused by the cavern's instability, rather than the other way around.
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Last edited by Emily; January 11th, 2013 at 05:12 PM. Reason: Clarifed sentence, added helicorder link.
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  #142  
Old January 15th, 2013, 05:01 AM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

There's a petition on the Whitehouse's web site asking that the Obama administration recognize the Bayou Corne disaster. If it gets 25,000 signatures by February 4th, they will definitely at least address the situation at that point.

https://petitions.whitehouse.gov/pet...e5b88829000000

You do not need to be an area resident to sign it, or even a U.S. citizen. I noticed on the Cajun Cabin's web site that the area has a lot of admirers who visit from all over the world.

http://www.cajuncabinsonline.com/?page_id=24
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  #143  
Old January 18th, 2013, 04:09 AM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

Smithsonian.com blogs:
Quote:
January 16, 2013 3:42 pm
Giant Sinkhole Is Swallowing Up a Louisiana Bayou Community
Posted By: Rachel Nuwer
http://www.southernstudies.org/2013/...-sinkhole.html
Quote:
Louisiana governor continues to ignore growing bayou sinkhole

By Cherri Foytlin, Bridge the Gulf

Over five months since the Texas Brine sinkhole first appeared over the Napoleonville Salt Dome, residents of Bayou Corne, Louisiana continue to struggle to be heard -- particularly by Governor Bobby Jindal.
..
The author of the above article in Southern Studies also has done a mini-documentary about the Bayou Corne disaster for a Gulf-based media group, 28 Stones. The article contains some embedded videos with longer interviews with residents. The first video has background about the history of industrial encroachment into the area.

Here's the main documentary, "A Hole in the Bayou":
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  #144  
Old January 20th, 2013, 07:33 PM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

Sinkhole seismic event studied

by robert stewart
Advocate staff writer
January 20, 2013

Scientists believe the restless, 8.5-acre sinkhole in Assumption Parish swampland is undergoing a “growth event”...

Officials first began noticing an increase in seismic activity about two weeks ago, said John Boudreaux, director of the Assumption Parish Office of Homeland Security and Emergency Preparedness.

Scientists reported that more than 80 seismic events were monitored two days ago, Boudreaux said.

“There was a tremendous amount of activity over the past couple of days,” Boudreaux said.

The sinkhole then “burped” up crude oil, debris and hydrocarbon to its surface around 10 a.m. Saturday, Boudreaux said. After the burp, the seismic activity decreased dramatically.

The latest “burp” is at least the third such event reported.

More...
http://theadvocate.com/home/4960234-...-event-studied
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  #145  
Old January 21st, 2013, 04:04 AM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

Quote:
Officials first began noticing an increase in seismic activity about two weeks ago...
That's about when they reported that the seismic waves from the Alaska earthquake passed through the area. So maybe that did trigger more problems, after all, though it was inevitable that something would trigger further movements if equilibrium hasn't been reached yet.

With TB's well pad cracking up now and movement being pinpointed to the dome's salt east of the cavern, this can't be good news. It will be really tragic if another community ends up abandoned in that area, but there is talk of buyouts already.

Another development that The Advocate reported is that standing water from a recent heavy rain revealed gas bubbling in the Bayou Corne community. The concept is like when the gas company coats a pipe or valve with soapy water to find a leak via the bubbles.

The Advocate: Rain Reveals Gas Bubbles

Video taken by Mike Schaff on January 18, 2013 posted by bridgethegulfproject:


rainbeaudais posted this video of the one of several bubbling areas on January 18th, 2013:
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  #146  
Old January 21st, 2013, 05:37 PM
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http://www.gpo.gov/fdsys/pkg/FR-2013...2013-00264.htm
Quote:
DEPARTMENT OF ENERGY

Federal Energy Regulatory Commission

[Docket No. CP13-31-000]


Gulf South Pipeline Company, LP; Notice of Application for
Abandonment

Take notice that on December 19, 2012, Gulf South Pipeline Company,
LP (Gulf South)
, 9 Greenway Plaza, Suite 2800, Houston, TX 77046, filed
in Docket No. CP13-31-000, an application pursuant to sections 157.7
and 157.18 of the Commission's Regulations under the Natural Gas Act
(NGA) as amended. Gulf South seeks authority to abandon the Magnolia
Gas Storage Facility (Magnolia Facility) at the Napoleonville salt dome
in Assumption Parish, Louisiana, and the storage services provided from
that facility
, all as more fully set forth in the application on file
with the Commission and open to public inspection. Gulf South also
seeks Commission authority to idle the facilities remaining at the
Magnolia Facility which were constructed and placed into natural gas
service in 2003, but are not proposed for refunctionalization as
transmission facilities in Docket No. CP13-12-000. These facilities
will remain physically in place and held for future use...
This facility was just constructed about 10 yrs ago:
http://www.thefederalregister.com/d....04-29-02-10434
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Last edited by Emily; January 21st, 2013 at 07:50 PM. Reason: Added better timeframe for GS Magnolia storage facility.
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  #147  
Old January 31st, 2013, 04:18 AM
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

It turns out that the article cited in post #138 is available for public distribution. There isn't much more detail about what happened, but the diagram indicates that it was a Texas Brine cavern:



Here's a dome map. I think the currently collapsing Oxy3 is the one I circled in red, and Oxy1 is the one I circled in purple:
(Hooker 6,7,8 got renamed to Vulcan 1,2,3 at some point...which is also called Oxy 1,2,3 now, I'm assuming)


(Source for above map: http://ucmwww.dnr.state.la.us/ucmsea...%2f4282885.pdf. Hat tip to Freedomrox for pointing this out.)

Oxy3 is the westernmost brine well (BW) on the dome at the point that map was made, but in 1987 on page 33 in this document, Texas Brine says Hooker 6 was the only well in that westernmost area that had encountered an 'anomaly' - shale. (There is more on that on page 75.)

That doesn't agree with the 1997 article by Sandia scientists, since Hooker 6 is a little east of Hooker 8, (a.k.a. Vulcan/Oxy3). So I'm still unsure about which of those two caverns had some sort of incident prior to 1997.
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  #148  
Old January 31st, 2013, 10:48 AM
mixin mixin is offline
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

Good find, Emily

The cavern in figure 7 sure looks like the current collapsing cavern. If so, then what happened to the shale sheath that prevented past problems?

The helicorders are really active at this time. Texas Brine was ordered to put the helis online, which they did; now they are back down to only 6 online for La. It would be great if we had some sort of situation update when we see action like what's happening today. Maybe they have already started with the vibrating equipment mentioned below?

Name:  Heli 14.jpg
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http://folkworm.ceri.memphis.edu/heli_temp/

There was a meeting yesterday but nothing has been posted yet at the parish site. However, the news covered it. It appears that the residents are understandably losing patience.

Regarding 3d seismic monitoring:
Quote:
Bayou Corne residents can expect to see vibrator trucks and air guns (equipment attached to flat bottom boats) in the area. Workers will use them to send vibrations in to the ground that will be picked up on measuring equipment around the area. Officials said it will take until at least mid April to wrap up testing.
http://www.nbc33tv.com/node/39541
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  #149  
Old February 2nd, 2013, 11:59 PM
freedomrox freedomrox is offline
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

Emily, and friends,

I just want to say I am so proud of your efforts and research skills. It blew me away how on top of this you have been, and that's saying something when I write a blog about it.

I believe I can answer your questions about Hooker #6, Oxy #1. Back in 1987Texas Brine sought to expand the solution mined cavern for larger storage capacity, but failed. They went down to 3000 ft. approximately, and hit shale rock. They then plugged off and cemented the bottom and proceeded to brine the cavern outwards more towards the top. This is the most deformed and shallowest of caverns as shown by the 1993 SONAR survey.

http://ucmwww.dnr.state.la.us/ucmsea...%2f4436906.pdf

As for the 1997 paper, this speaks of Oxy 3, as is shown by coordinates of it being the westernmost cavern in the Salt Dome. The last 500 ft. at the time, showed the straight line deformation of where the cavern had been miscalculated and was now resting upon the shale sheath, which is all that held containment at the time.

SONAR Survey and VSP shown at my blog.
http://freedomrox.wordpress.com/2013...-fail-in-2010/

What was not taken into account was two-fold, first they did not take into account the effects of drawdowns, as this would widen the area against the sheath that was bereft of salt. This finally left about the deepest 1000 ft. (4500-5500 ft.) of the cavern and the contents and pressures sitting on the actual shale sheath itself from the inside.

The second thing not taken into consideration was that salt creeps. When a cavern is filled it is under pressure, plus the weight of the overburden, and when it is drawndown then the salt creeps back in with the difference in temps and pressures. In a very real way, it can be stated a salt cavern functions similar to a lung. This is due to the plasticity of salt rock. Shale has no such elasticity. It can only take so much in the way of pressure, and then it fractures.

Now, add to this that Big Hum, Marg Vag and all the oil and gas and water formation sands were pressing from the outside of the Salt Dome and pinching up against the very same shale sheath that was dealing with the cavern pressures in almost the exact same spots but from opposing sides. When this shale sheath finally fractured, it was a mighty geologic explosion 4500-5500 ft. down. Enough of one to fracture the shale and other materials all the way to the surface.

Every bit of this was known by LDNR and Texas Brine long before the mill out that failed the MIT test, and they Plugged and Abandoned Oxy #3. If they had drawndown the cavern one last time and Cemented the bottom 1000 ft.. then pumped back the brine and P&A'd the cavern, then this probably would not have ever happened. Due to the costs, they chose not to. LDNR knew this as well, even about the oil sands pressing against the shale sheath and cavern, due to their accessibility to Golden Gate's proprietary 3-D 2007 survey, that no one else has been allowed to see.

I wonder what Texas Brine thinks about the cost of that cementing job now?

Last edited by freedomrox; February 3rd, 2013 at 01:15 AM. Reason: For the latest news and events, please visit: Louisiana Sinkhole Bugle http://lasinkhole.wordpress.com/ Very good blog.
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  #150  
Old February 3rd, 2013, 01:04 AM
Laidback Al Laidback Al is offline
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Default Re: Louisiana: Assumption Parish Bayou Corne Sinkhole 2012

Welcome to FluTrackers, freedomrox. Thanks for your positive comments and information.


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arch specialty insurance co., assumption parish gas bubbles, bayou corne cats, bayou corne sinkhole, gas cavern storage, occidental petroleum, petrochemical industry, solution salt mining, texas brine


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