A STRATIGRAPHY DESCRIPTION OF THE MISSISSIPPIAN ROCKS OF KANSAS USING PETROPHYSICAL AND POROSITY ANALYSIS

This study explains the stratigraphic, Paleo-depositional environment, and characteristics of lithilogies using petro physical and porosity analysis of the core from the McPherson County. The Cambrian-Ordovician Arbuckle Group is one of the major oil producers in Kansas, though production has been limited to the upper few meters. A drill core obtained from section 36, township 19S, and range 1W in McPherson County, Kansas registered a depth of 2916ft-2998ft below the subsurface. The core section between a depth of 2950ft and 2998ft was used in describing the stratigraphic and Paleo-depositional environment of the interval. The core of rocks is of the Mississippian age, and is composed of limestone, shale, dolomite, chert and sandstone. Porosity was calculated using the Density and Neutron logs, the permeability was determined using the resistivity log, and gamma ray log and density logs were used in describing the lithologic characteristics of the interval.

Preliminary studies from well log data showed that the interval was deposited in a deep marine environment. The average porosity ranged from 5% to 8%, and the maximum porosity occurred at the interval of 2994ft-2998ft on the core section. The highest porosity was recorded at a depth of 2995ft to 2998ft and was associated with zones that have very large pores. Gamma ray response showed a serrated cyclic trend, which can be inferred that sediments were deposited in deep marine environment. Further research into the study will indicate the stratigraphy, Paleo-depositional environment, and characteristics of lithilogies of the location and Mississippian rocks of Kansas.