Sequence Stratigraphy of Springer Reservoirs in the eastern Anadarko Basin

John Turmelle1

¹Apache Corporation

Two hydrocarbon reservoirs in the Springer Group, the Britt sand in the Eakly-Weatherford Trend and the Boatwright sand in Verden Field, can be described in terms of sequence stratigraphy. The Springer Group was deposited in a shallow epeiric sea during the time of a sea level low-stand between the Late Mississippian Chester Series and the Early Pennsylvanian Morrow Series. The Eakly-Weatherford trend stretches northwest to southeast for twenty-five miles across Caddo County, Oklahoma. Correlations indicate that at the top of the Britt sand there is a regionally significant sequence boundary with truncation below and onlap above. Using the concepts of sequence stratigraphy leads to the conjecture that the Eakly-Weatherford Trend is an eroded highstand systems tract subsequently transgressed by marine shale. In Verden Field, the Boatwright sand is productive from a high-stand coarsening-upward deltaic system. The reservoir is bounded not by a facies change but rather a sequence boundary that eroded the delta. Above this sequence boundary thin channel sands and shale of an alluvial systems tract were deposited. Seismic interpretations demonstrate the erosion of the reservoir that occurred during a drop in sea-level. The trend of the facies tracts is perpendicular to present day structural strike.

AAPG Search and Discover Article #90097 © 2009 Tulsa Geological Society, Tulsa, Oklahoma

 

 

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