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Granite Wash Shale Play
Hart Energy Publishing, September 2011
The Granite Wash play represents a set of stacked formations of mainly Pennsylvanian age geology spanning across the Texas Panhandle into western Oklahoma in the Anadarko Basin. The name comes from the reservoir rocks that were eroded from granites and then re-deposited. Depending on the definition, the play covers between 2 million to 3.5 million acres, with production historically from more than 10 counties.
Generally tight with low permeability, the play requires hydraulic fracturing to achieve economically viable wells. Exploration and development efforts target pay zones at vertical depths between 8,000 and 15,000 feet. The gross pay can be between 1,500 and 3,000 feet, with net pay per formation usually around 50 to 150 feet. By its nature, Granite Wash is a multi-stacked play with the different target formations having varying properties, making it more heterogeneous than other unconventional