--> ABSTRACT: Sequence Stratigraphy of Oomoldic Reservoir Analogs in the Swope Formation (Missourian Series, Pennsylvanian System) in Eastern Kansas and Western Missouri, by Nathan Aaron Wilke and Timothy R. Carr; #90906(2001)

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Nathan Aaron Wilke1, Timothy R Carr2

(1) Kansas Geological Survey and University of Kansas, Odessa, TX
(2) Univ of Kansas, Lawrence, KS

ABSTRACT: Sequence Stratigraphy of Oomoldic Reservoir Analogs in the Swope Formation (Missourian Series, Pennsylvanian System) in Eastern Kansas and Western Missouri

This study of the depositional environments and the sequence stratigraphic framework of the Swope Formation (Missourian Series, Pennsylvanian System) in eastern Kansas and western Missouri contributes to understanding small-scale cyclicity and sequence stratigraphy of midcontinent carbonate reservoirs. Subaerial exposure surfaces and associated features are common components of shallow-marine carbonate reservoirs in the Pennsylvanian of the midcontinent. Improved criteria for recognition of such surfaces are of economic importance because the distribution of reservoir facies is closely associated with subaerial exposure.

Detailed field descriptions, petrographic examination, and spectral gamma-ray logs of outcrops and shallow cores from fourteen localities were integrated to better understand vertical and lateral variability of reservoir facies within the Bethany Falls Limestone of the Swope Formation. Eight distinct lithofacies and associated pedogenic features were differentiated on the basis of polished slabs, thin section analysis and log response and were used to define a sequence stratigraphic model.

Two cycles of eustatic sea-level change were recognized based on identification of exposure surfaces, correlation of lithofacies, and interpreted depositional environments. These eustatic sealevel changes resulted in the formation of two sequences within the study area. Antecedent topography, and changes in relative and eustatic sealevel affect regional depositional patterns. Diagenesis associated with overlying exposure surfaces strongly influences the development of oomoldic reservoir facies in the Bethany Falls Limestone. This study also improved understanding of regional stratigraphic relationships within the Swope Formation and related units.

AAPG Search and Discovery Article #90906©2001 AAPG Annual Convention, Denver, Colorado