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E & P NOTES |
1 Petroleum Research Section, Kansas Geological Survey, 1930 Constant Avenue, Lawrence, Kansas 66047; saibal{at}ku.edu
2 Petroleum Research Section, Kansas Geological Survey, 1930 Constant Avenue, Lawrence, Kansas 66047
3 Petroleum Research Section, Kansas Geological Survey, 1930 Constant Avenue, Lawrence, Kansas 66047
4 Petroleum Research Section, Kansas Geological Survey, 1930 Constant Avenue, Lawrence, Kansas 66047
5 Charter Development Corporation, 225 North Market, Suite 340, Wichita, Kansas
Saibal Bhattacharya holds a B.Tech. degree in petroleum engineering from the Indian School of Mines (India), M.S. degrees in petroleum and environmental engineering, and an M.B.A. degree from the University of Kansas. As a reservoir engineer at the Kansas Geological Survey, his research focuses on integrated reservoir characterization, simulation, and field demonstration studies. He is a member of the Society of Petroleum Engineers and AAPG.John Doveton is a senior scientist at the Kansas Geological Survey. He received a B.A. degree from Oxford University and a Ph.D. from Edinburgh University, both in geology. Prior to going to the Kansas Geological Survey, he was an exploration geologist with Mobil Canada. His research interests are in petrophysics and mathematical geology.
Timothy Carr is chief of the Energy Research Section of the Kansas Geological Survey and codirector of the Kansas University Energy Research Center. Tim has a B.S. degree (economics) and a Ph.D. (geology) from the University of Wisconsin, along with an M.S. degree from Texas Tech University (geology). He worked for 13 years for ARCO Oil and Gas as a research and exploration geologist.
Willard J. (Bill) Guy graduated from the University of Colorado in 1955. He was an exploration geologist with the Union Oil Company for 25 years, Kirkwood Oil and Gas for 6 years, and a consultant for 5 years. For the past 14 years, he has been a research geologist with the Kansas Geological Survey, where his primary research interests have been in log analysis and petrophysics and petroleum exploration.
Paul Gerlach specializes in reservoir modeling by integrating geological and geophysical data. He has more than 30 years of experience working in the Anadarko basin, Hugoton embayment, Las Animas arch, central Kansas uplift, and Sedgwick basin. Prior to working at Charter Consulting, he was a research scientist at the Kansas Geological Survey and vice president of exploration at Charter Production Co.
Small independent operators produce most of the Mississippian carbonate fields in the United States mid-continent, where a lack of integrated characterization studies precludes maximization of hydrocarbon recovery. This study uses integrative techniques to leverage extant data in an Osagian and Meramecian (Mississippian) cherty carbonate reservoir in Kansas. Available data include petrophysical logs of varying vintages, limited number of cores, and production histories from each well. A consistent set of assumptions were used to extract well-level porosity and initial saturations, from logs of different types and vintages, to build a geomodel. Lacking regularly recorded well shut-in pressures, an iterative technique, based on material balance formulations, was used to estimate average reservoir-pressure decline that matched available drillstem test data and validated log-analysis assumptions.
Core plugs representing the principal reservoir petrofacies provide critical inputs for characterization and simulation studies. However, assigning plugs among multiple reservoir petrofacies is difficult in complex (carbonate) reservoirs. In a bottom-up approach, raw capillary pressure (Pc) data were plotted on the Super-Pickett plot, and log- and core-derived saturation-height distributions were reconciled to group plugs by facies, to identify core plugs representative of the principal reservoir facies, and to discriminate facies in the logged interval. Pc data from representative core plugs were used for effective pay evaluation to estimate water cut from completions, in infill and producing wells, and guide-selective perforations for economic exploitation of mature fields.
The results from this study were used to drill 22 infill wells. Techniques demonstrated here can be applied in other fields and reservoirs.
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