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 Kansas Geological Survey Open-file Report 2003-27 |
Summary
This poster is an illustration of the first phase to build an improved 3D stochastic model and simulation on St. Louis carbonate systems.
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Seven lithofacies (six main lithofacies) were recognized and classified through the description of fifteen cored wells of three St. Louis oolite shoal reservoirs in Southwestern Kansas.
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Sequence stratigraphic surfaces were recognized and picked from the cored wells.
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The reservoir lithofacies, ooid skeletal grainstone, has distinctive petrophysical properties from other non-reservoir lithofaices.
- Lithofacies were trained with digital logs (GR, Rt, PE and Porosity) to build neural network models from cored wells, and lithofacies were predicted in non-cored wells with these models;
- Sequence Stratigraphic surfaces were picked in all non-cored well based on the log response.
Further Work
Additional work will include:
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Stratigraphic surfaces will be input into RMS (Roxar) to build a 3D stratigraphic framework.
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Object-based stochastic modeling (RMS) will be performed to build lithofacies models in three St. Louis oolite reservoirs to model the 3D external geometries of St. Louis oolite shoals.
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Internal geometries of St. Louis oolite shoals will be illustrated by building 3D porosity and permeability distribution models using stochastic simulation (RMS).
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Geostatistical models will be verified by inputting into a reservoir simulator and performing a production history match
Reference
Abegg, F.E., Loope, David b., and Harris, P. M., 2001, Deposition and Diagenesis of Carbonate Eolianites: Modern and ancient carbonate eolianites: Sedimentology, Sequence Stratigraphy, and Diagenesis, SEPM special publication No. 71, p. 17-32.
Abegg, F.E., and Handford, C. Robertson, 2001, Deflation origin of Mississippian Carbonate Eolianites of Southwestern Kansas: Modern and ancient carbonate eolianites: Sedimentology, Sequence Stratigraphy, and Diagenesis, SEPM special publication No. 71, p. 183-203.
Carr, D. D., 1973, Geometry and origin of oolite bodies in the Ste. Genevieve Limestone (Mississippian) in the Illinois basin: Indiana geological survey Bulletin 48, 81 p.
Carr, T. R. and Lundgren, Carl E, 1994, Use of Gamma Ray Spectral Log to recognize Exposure Surfaces at the Reservoir Scale: Big Bow Field (St. Louis Limestone). Kansas: Unconformity-related hydrocarbons in sedimentary sequences, Rocky mountain association of geologists, p. 79-88, 281.
Gary, Richard J., 1994, Petrophysical Characterization of Mississippian Ooid-Shoal Reservoirs, Hugoton Embayment, Southwest Kansas, Armco, 46 p.
Handford, C. R., 1988, Review of carbonate sand-belt deposition of ooid grainstones and application to Mississippian reservoir, Damme Field, southwestern Kansas: AAPG Bulletin, V. 72, p. 1184-1199.
Garsmueck, Mark, and Weger, Ralf, 2002, 3D GPR reveals complex internal structure of Pleistocene oolitic sandbar: The Leading Edge, p 634-639.
Acknowledgment
I would like to thank the Kansas Geological Survey for providing the funds for this project as a part of my doctoral research at the University of Kansas. I also would like to specially thank Geoff Bohling for providing help at neural network modeling part, and Dr. Robert Goldstein for insight in this project.
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Last updated May 2003
http://www.kgs.ku.edu/PRS/publication/2003/ofr2003-27/P3-07.html