New shale play could give Oklahoma's oil production springs

摘要

A Lower Pennsylvanian target that hasn't been tested until recently with horizontal drilling could, according to Continental Resources Inc., make the state the third-largest oil producer in the U.S. The Springer Shale is in south- central Oklahoma and the most productive drilling is taking place in Garvin, Grady and Stephens counties. According to Conti- nental, the Springer Shale, termed Mississippian Goddard by some companies, is relatively shallow at 12,500 feet and ranges in thickness up to 150 feet. It is an overpressured. organic-rich. highly siliceous formation with a low percentage of clay and high porosity and permeability. The Springer lies above the Merramec and Woodford formations.