^M S^aaav 557 IL6of 2002-1 Reservoir Characterization & 3D Models of Mt Simon Gas Storage Fields in the Illinois Basin Annual Technical Progress Report Reporting Period Start Date: October 2000 1 , Reporting Period Ending Date: September 30, 2001 Principal Author: David G. Morse Date Report Issued: February 22, 2002 DOE Award Number: DE-FG26-99FT40375 Principal Investigator: David G. Morse Illinois State Geological Survey 615 E. Peabody Dr. Champaign, IL 61820 Submitting Organization: The Board of Trustees of the University of Illinois Grants & Contracts Administration 109 Coble Hall 801 South Wright Street Champaign, IL 61820-6242 Reservoir Characterization & 3D Models of Mt. Simon Gas Storage Fields in the Illinois Basin Annual Technical Progress Report Reporting Period Start Date: October 2000 1 , Reporting Period Ending Date: September 30, 2001 Principal Author: David G. Morse Date Report Issued: February 22, 2002 DOE Award Number: DE-FG26-99FT40375 Principal Investigator: David G. Morse Illinois State Geological Survey 615 E. Peabody Dr. Champaign, IL 61820 Submitting Organization: The Board of Trustees of the University of Illinois Grants & Contracts Administration 109 Coble Hall 801 South Wright Street Champaign, IL 61820-6242 Digitized by the Internet Archive in 2012 with funding from University of Illinois Urbana-Champaign http://archive.org/details/reservoircharact20021illi Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to a specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Abstract The Cambrian Mt. Simon Sandstone forms the reservoir for many gas storage sites in northern Illinois. Detailed characterization of this reservoir unit will improve understanding of gas injection and production, and can be used at a later time to prepare reservoir fluid flow simulations for optimal field management. Regional mapping of the Mt. Simon, involving several thousand wells, will identify its lateral variation and structural configuration, and will help identify possible future storage sites. Detailed studies using Landmark software at Manlove and Herscher fields will provide benchmark reservoir characterization frameworks that can be applied elsewhere. The Manlove study with over 300 wells, 35 of which have core analyses, has progressed relatively quickly, primarily because digital logs were available. Internal correlation markers, cross-sections, structure and isopach maps, and both preliminary Vshale and porosity 3D models have been completed. Core from one well has been described, sampled and analyzed in order to determine the depositional environment, facies, mineralogy, and their relation to porosity. A second Manlove core is being prepared for similar analyses. A tech transfer paper on 3D Modeling of Manlove Field was presented at professional meetings in May 2001 to the Midwest Gas Storage Chapter of the Society of Petroleum Engineers and in September 2001 to the Eastern Section of the American Association of Petroleum Geologists. The Herscher field study is in progress and will follow procedures and techniques developed in the initial study of Manlove Field. Logs in Herscher from approximately 250 wells have being digitized and loaded into the Landmark workstation. Formation correlations have been drawn and Vshale and porosity are about to be calculated in preparation for building the 3D model of Herscher field. Picking of regional formation tops in all wells of northern Illinois is nearing completion. The database containing log tops of a variety of marker formations from nearly 6000 wells has been compiled. Logs from three counties in the north-central tier remain to be picked. The area covered by the database has prime potential for new gas storage sites. Data have yet to be collected for the twelve sparsely drilled counties in northern Illinois. These counties are of low priority because the Mt. Simon Sandstone may be too shallow for effective gas storage. A one year, no cost extension was obtained for this project. Present deadline for project completion is Sept. 30, 2002. Table of Contents Disclaimer 2 Abstract 2 Table of Contents 3 List of Graphic Materials 3 Executive Summary 4 Introduction 5 Results and Discussion of the Past Year 5 Manlove 5 Herscher 8 Regional Mapping 8 Conclusions 11 List of Figures 1. Structural features of North Central Illinois 13 2. Gamma Ray log and Geologic Column from Manlove Field 14 3. Structure map of the top of the Mt. Simon Sandstone at Manlove Field 15 4. Wire diagram of the top of the Mt. Simon Sandstone at Manlove Field 16 5. Gamma Ray and Compensated Density-Neutron Log of Mt. Simon Sandstone in Manlove Field 17 6. East-West structural cross section across the center of Manlove Field 18 7. Cross-bedded Sandstone 19 8. Granule Conglomerate 19 9. Bioturbated Sediments 20 lO.Bioturbated fine sandstone and interbedded shale with sand filled mud cracks 21 11. Rhythmic Shale and Sandstone 21 12. Laminated Shale 22 13.Thin section of coarse-grained sandstone with pronounced quartz overgrowths and clean open pores 23 14.Thin section of poorly sorted fine sandstone with coarse quartz grains 23 15.SEM image of clean medium-coarse sandstone with quartz overgrowths 24 16.SEM view of trace amounts of illite clay growing on a quartz overgrowth 24 17. 3D Structural Volume of Manlove Field Porosity Model 25 18. North-South Structural Cross section of Manlove Field porosity model 26 1 9. North-South Stratigraphic Cross section using Top of Mt. Simon as a datum. .27 .. 20.West-East Structural Cross section of Porosity model across Manlove Field.... 28 21 .West-East Stratigraphic Cross section across crest of Manlove Field using Top of Mt. Simon as a datum 29 22. Horizontal Stratigraphic Slice of Porosity Model 10.7m (35') below the top of the Mt. Simon Sandstone in Manlove Field 30 23. Stratigraphic Slice map of Manlove Field porosity model 25.6m (84') below the top of the Mt. Simon Sandstone 31 24. Stratigraphic Slice map of Manlove Field porosity model 32.6m (107') below the top of the Mt. Simon Sandstone 31 25. Stratigraphic Slice map of Manlove Field porosity model 36.7m (120') below the top of the Mt. Simon Sandstone 32 26.Structural Model ofVshale across Manlove Field 33 27. West-East Stratigraphic Cross section of Vshale across Manlove Field. Datum is the top of the Mt. Simon Sandstone 34 Executive Summary Digital data have been prepared and organized to characterize the Mt. Simon Sandstone gas storage reservoirs in two fields in Illinois, the Manlove Field in Champaign County and the Herscher Field in Kankakee County, in order to improve the understanding of gas injection and production. This characterization can be used at a later time to prepare reservoir fluid flow simulations for optimal field management. Regional structure maps of the top of the Maquoketa Shale, Galena-Platteville Group and Mt. Simon Sandstone also will be prepared to identify possible locations for new storage fields. Manlove Field, a 150 BCF aquifer gas storage field in Champaign County, Illinois operated by Peoples Energy Corp., is formed by a closed anticline in the Cambrian Mt. Simon Sandstone, a quartz sandstone aquifer about 4000 feet underground with a sealing caprock formed by the overlying Cambrian Eau Claire Formation. The field, located about 130 miles south of Chicago, began operation in 1966. Maximum daily withdrawal is nearly 1 BCF. Gas is transported to the Chicago market via two large- diameter company-owned pipelines. Digital well log and core data for the Manlove field have been compiled using Landmark Openworks software. Logs from over 300 wells and core analyses from 35 wells provide the framework for this study. Formation and internal Mt. Simon correlations, cross sections, structure and isopach maps have been prepared. Core from the J. Williams #4 well has been described and analyzed in order to determine the