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 Kansas Geological Survey Open-file Report 2003-27 |
Reservoir Characterization of Mississippian St. Louis Carbonate Reservoir
Systems in Kansas, Stratigraphic and Facies Architecture Modeling
Reservoir Characterization of Mississippian St. Louis Carbonate Reservoir Systems in Kansas, Stratigraphic and Facies Architecture Modeling
Lianshuang Qi and Timothy R. Carr. Kansas Geological Survey
Abstract
Mississippian St. Louis (Meramecian) oolitic grainstone shoals were widely deposited across North American, and are important petroleum reservoirs in the Midcontinent. To develop an improved understanding of the depositional controls on complex geometry and distribution of St. Louis oolitic grainstone reservoirs, the external geometry and spatial continuity of individual selected oolite shoals were studied.
An improved geologic approach was used to model the sequence stratigraphic, lithofacies, and reservoir architectural framework of the St. Louis carbonate reservoir systems in three fields in Southwestern Kansas. Sequence stratigraphic surfaces were recognized from both cores and logs, and provided the basis of construct a sequence stratigraphic framework to constrain further reservoir analysis. Lithofacies were described and classified using cores for approximately 15 available wells. A neural network analysis tool (Kipling.xla) was used to calibrate core-scaled lithofacies to log-scaled petrofacies using suites of log curves (GR, resistivity, density and neutron porosity, and PE). Using the Kipling approach, log attributes from hundreds wells were used to predict lithofacies and petrofacies in wells without cores. The predicted results provides input for stochastic object-based modeling of the 3D geometry and connectivity of individual oolite lobes.
Improved quantitative lithofacies and petrofaices models for St. Louis carbonate reservoir systems can improve our understanding of key factors that control the facies distribution, and the production of hydrocarbons within carbonate shoals.
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Last updated May 2003
http://www.kgs.ku.edu/PRS/publication/2003/ofr2003-27/P1-02.html