Oil Producing Zones of Kansas :
The Lansing-Kansas City consists of a widespread of alternating limestone’s and shale’s deposited during a time of alternating transgression and regression of the shallow inland seas. As a result, numerous reef-like carbonate structures were developed. These structures were subsequently subjected to conditions conductive to the development of secondary porosity zones, resulting in excellent hydrocarbon accumulations. The overlying shale’s as well as impermeable limestone zones produce the trapping mechanisms for hydrocarbon accumulations. Occasional stratigraphic traps are also noted, presumably the result of the loss of porosity of permeability in the up dip direction.
The Cherokee Sand is found directly above the Mississippian rocks, separated from them by shale section. The sand is discontinuous, but can be highly productive when present, as indicated in the Carver Rob bins pool in Northwest Pratt County, Kansas and the numerous producing channels in the northwestern part of South Kansas area.
The top of the Mississippi is a major erosional unconformity across Kansas. As a result, Mississippi production in this area is from an Osage chert section at the top of the Mississippian and from a sand lens in the Mississippi section, which is usually referred to as the Kinderhook sand. In the present above the Osage chert, providing excellent hydrocarbon reservoirs. The Mississippi is absent north into Stafford County.
The Viola is the uppermost formation of Ordovician age in this area, and is completely absent to the north into Barton County. The Viola has been subjected to intense erosion once and possibly twice. This has resulted in poor structural alignment of the Viola in relation to the underlying rocks. Production in the Viola, then, is not entirely dependent on structural position, but also on the development of secondary porosity in the cherty limestones of dolomites.
Production from the Simpson is found in what appears to be blanket sand found 10-30 feet below the top of the Simpson shale. Excellent oil production is found when the sand is both thick and structurally high. Where the sand thins, it often tends to be shaly or dolomitic, resulting in less desirable reservoir conditions. The Simpson disappears entirely north of Barton County.
Production from the Arbuckle dolomite occurs primarily in the north central part of the area with both oil and gas being present. Production is generally found in structurally high porosity zones, many of which may be termed paleogeoraphic or erosional traps, as the top of the Arbuckle is a major unconformity across the area.