Wichita County Leases and Geology Maps
The Wichita County Regular reservoir draws its oil production from anticlinal traps in the Cisco sands of the Upper Pennsylvanian at depths from 700 to 1900 feet. The productive sandstones are the result of transgressive and regressive shoreline cycles in marine, deltaic and fluvial environments.
The sands lie within the Electra Arch, an east west anticlinal feature which extends through three counties from west to east, Foard County, Wichita County and Clay County. The sands are generally fine to medium grained, well sorted and homogeneous. lsopachs of several of the sands indicate widespread and overlapping sands within the leases.
As of July 2003 the Fowlkes leases collectively produced 1,014,414 barrels of oil since oil was first produced from the leases in 1913. The initial productive sand was the 800 foot sand. Subsequent production was obtained from the 850, 950 and 1,400 foot sands as shown in the geology maps below.