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.
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.
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.
The Eagle Ford is directly under the Austin Chalk then there is Eutaw then TMS is directly above the Tuscaloosa sands.
The generalized strat. map of area in question from youngest to oldest is the following:
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.
You left out the EF right under the AC.
"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.