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EIA recently updated its methodology and production volume estimates for U.S. shale gas and tight oil plays to include seven additional plays, increasing the share of shale gas by about 9% and tight oil by 8% compared with previously estimated shale production volumes.
The update captures increasing production from new, emerging plays as well as from older plays that had been in decline but are rebounding because of advancements in horizontal drilling and hydraulic fracturing. The selected plays are identified by examining the reservoir names reported by operators to state agencies. EIA uses the third party data source, Drillinginfo, which collects and distributes well level data gathered by the states.Hubbert's peak oil theory: "... had been in decline but are rebounding."
The most productive of the newly added plays is the Mississippian formation, which is located mainly in Oklahoma within the Anadarko Basin. The mainly carbonate rock type lies above the Woodford play and has produced liquids and natural gas for some time, but newer completion techniques have driven recent production gains.
The remaining six plays are smaller and are included in the rest of U.S. tight oil and shale gas categories.
- The Burket and Geneseo formations in the Appalachian Basin of Pennsylvania and West Virginia increased production in recent years. These dry shale gas formations lie above the Marcellus Shale but are thinner and do not cover as large an area as the Marcellus.
- The Uteland Butte member of the Green River Formation in the Uinta Basin of Utah is composed primarily of limestone, dolostone, and organic rich mudstones and siltstones.
- The Turner, Frontier, Sussex-Shannon, and Teapot-Parkman formations are located in the Powder River Basin of Wyoming and lie below and above the Niobrara formation, the basin’s primary hydrocarbon-bearing formation. They are mainly fine-grained sandstone with interbedded silt and shale
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