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Permalink Reply by littleasy on August 29, 2011 at 12:18

Is this the Eagle Ford or the TMS?  The EF is between the base of the Austin Chalk and the Upper Tuscaloosa sands!!  In some areas of central LA, the EF is 1,000 feet thick.  It sounds to me they are sloppy in their nomenclature or just hyping the TX play.

Thanks

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Permalink Reply by Two Dogs, Pirate on August 29, 2011 at 12:50

I have to take Indigo at their word.  They said the formation they are drilling is the Eagle Ford. I wish them all the luck in this project.

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Permalink Reply by dbob on August 29, 2011 at 13:00

Two Dogs

 

Not that the USGS is deffinative, the attached map shows the area it identifies as Eagle Ford Shale.   That is to say it is productive/economic across its entire range. 

Attachments:

• usgs map.jpg, 1.5 MB

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Permalink Reply by littleasy on August 29, 2011 at 13:52

http://www.prymeenergy.com/irm/Company/ShowPage.aspx/PDFs/2021-6434...

 

Pryme also talks about the EF and not the TMS?

 

"Logging during the drilling of the Deshotels 20H No.1 indicated potentially productive zones in the Wilcox formation at approximately 12,000 feet, the Austin Chalk formation at approximately 15,000 feet, and the Eagle Ford formation at 16,000 feet"

 

Based on the interval between the AC and the EF (1,000 ft), I would say they are using the name EF but are actually referring to the TMS.

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Permalink Reply by Two Dogs, Pirate on August 29, 2011 at 16:13

Why?

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Permalink Reply by Joe Aldridge on August 30, 2011 at 5:47

They have not drilled deep enough to encounter the TMS. It is directly above the Tuscaloosa sand and is separated from the EF by Eutaw.

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Permalink Reply by Joe Aldridge on August 30, 2011 at 5:45

littleasy,

The Eagle Ford is directly under the Austin Chalk then there is Eutaw then TMS is directly above the Tuscaloosa sands.

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Permalink Reply by littleasy on August 30, 2011 at 7:16

The generalized strat. map of area in question from youngest to oldest is the following:

 

Chalk (Austin)

Eutaw (Eagle Ford Shale)

Upper Tusc. (Sands)

Marine Shale (TMS)

Lower Tusc. (Sands)

 

Based on structure, IMHO, they are talking about the TMS.  But, I could be wrong.  They could be more consistent in their nomenclature but that doesn't seem to be a priority.

 

 

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Permalink Reply by Joe Aldridge on August 30, 2011 at 7:49

littleasy,

You left out the EF right under the AC.

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Permalink Reply by littleasy on August 30, 2011 at 8:30

Joe, the Eutaw or Eagle Ford is right below the base of the AC.  On the Indigo link provided by Resourceplay says TMS-AC Activity.  However, they could be targeting part of the Eagle Ford above the TMS.  They are either using the names (EF and TMS) synonymously or they are describing two different intervals.  The two are talked about as being age-equivalent.

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Permalink Reply by littleasy on August 30, 2011 at 8:53

http://www.eaglefordshale.com/geology/

 

Yes, ShaleGeo

 

"Legacy Austin Chalk producing areas (e.g. Giddings Field) have not proven to be the best drilling targets for the Eagle Ford. One theory is the Eagle Ford Shale formation improves as you move south due to degradation of the Austin Chalk’s reservoir properties, which in turn means the Eagle Ford expelled less oil and retained more."

 

"The shale is more of a carbonate than a shale, but “shale” is the hot term of the day. The Eagle Ford Shale’s carbonate content can be as high as 70%. The formation is more shallow and the shale content increases in the northwest portions of the play. The high carbonate content and subsequently lower clay content make the Eagle Ford more brittle and easier to stimulate through hydraulic fracturing or fracking. In geological terms, the Eagle Ford dips toward the Gulf of Mexico."

 

I'm sticking with TMS until they provide more info about EF as the target.

 

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Permalink Reply by Resourceplaya on August 30, 2011 at 16:48

Absolutely agree Jay.

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