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Barnett Shale

Oil field
The Barnett Shale is a geological formation located in the Bend Arch-Fort Worth Basin. It consists of sedimentary rocks dating from the Mississippian period in Texas. The formation underlies the city of Fort Worth and underlies 5,000 mi² and at... Wikipedia
Depth: 6500–9500 feet
Discovery: 1980s
Estimated gas in place: 2.1–30×1012 cu ft; (59–850×109 m3)
Operators: Devon, Total, GEV Group, EOG, XTO, Range Resources, EnCana, ConocoPhillips, Quicksilver, Chief Oil and Gas, Denbury
Producing formations: Barnett Shale
Start of production: 1999