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The AAPG/Datapages Combined Publications Database

Kansas Geological Society

Abstract


Southeastern Kansas and Northeastern Oklahoma: Guidebook, 11th Annual Field Conference, 1937
Pages 85-92

Petroleum Geology of Nowata and Washington Counties, Oklahoma

T. E. Weirich

Abstract

Surface outcrops are of Pennsylvanian age. The formations converge toward the northwest with Cherokee beds resting unconformably on the underlying Mississippian and overlapping progressively westward. Regional structure is a westward-dipping monocline, broken by isolated anticlines. Normal surface dip is 40 feet per mile. Oil was discovered in 1897 in what is now the town of Bartlesville. Aggressive development occurred in the early 1900's. Seven sandstones and one limestone of Pennsylvanian age, as well as one Ordovician limestone, have produced possibly in excess of 300,000,000 barrels of oil in the district. Gas is also an important product of these horizons. The Pennsylvanian sands are almost entirely monoclinal in structure and lenticular in distribution. Repressuring by water-flooding is partially successful, but projects are still in the experimental stage, Recent coring in the old fields indicates 10% to 30% of the original oil content has been removed by natural flowing and pumping over a period of 30 years. The Bartlesville sandstone is persistent over a large area in south-central Oklahoma. Its area of deposition narrows toward the north, terminating in two "fingers" in Washington County. In Nowata County the sandstone is considered to be of littoral deposition with various types of nearshore sedimentation. Source of the sandstone appears to have been a land mass to the south. Transportation was effected by marine currents issuing from the neighborhood of Llanoria, trending northwestward but deflected to the northeast in east-central Oklahoma by the positive Central Kansas uplift.


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