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Reinterpretation of the Structural Configuration of the Northern Nemaha Ridge Area in the Forest City Basin, Brown and Nemaha Counties, Kansas

Steven Tedesco and Chad Counts

The Nemaha Ridge in Eastern Kansas and Nebraska forms the western boundary of the Forest City and Cherokee Basin. There is a general trend of prolific productive structural highs that parallel the ridge which produce from the Simpson, Viola and Hunton reservoirs at less than 4,000 feet. The average well in the Forest City Basin is 90 MBO per well on 20 acre spacing. The area is lightly drilled relative to other explored areas in the basin owing to the difficulty of finding productive reservoirs. Aeromagnetic data indicates a series of main northeastern trending basement faults cross-cut by secondary northwest and west trending faults. Well data and seismic confirm many of these faults, which are generally high angle and wrenched offsetting fault blocks. The faults are wrench and generally high angle. The apex of any particular structure and thus productive reservoirs commonly do not stack but are slightly offset due to the high angle of faulting. The Livingood Field, Brown County, Kansas lies on the northern end of this trend and was discovered in 1944. The field has been defined in the literature as a single structural high but detail analysis using subsurface geology and seismic data indicate it's a series of structural highs related to wrench faulting. This model has been applied to several other areas along the ridge and demonstrates it as applicability to finding new reserves. 

AAPG Search and Discovery Article #90176©AAPG Mid-Continent Meeting, Wichita, Kansas, October 12-15, 2013