Actual boundaries are at a much lower angle.ģ-D models of porosity respective grid spacings were 100 by 100 cells (200 by 200 m), and 250 by 250 cells (85 by 85 m) in the X-Y (east-west, and north-south) directions, and 50 cells (1.5 ft) in the Z (depth) dimension movie images were gridded using the closer (250 by 250) cell spacing so animations would flow better. The exaggeration results in a greatly increased upward and shoreward (westward) step in sand-ridge unit (sandstone bed) boundaries. Vertical exaggeration is listed on figures. Most figures exhibit, and include, considerable Z-axis exaggeration the purpose is to better show porosity and permeability distribution within the Sussex. Vertical slices through the field show dispersal of permeability and porosity slices were chosen based on 3-D distribution of core data and well control. Using these contour parameters, map features are sometimes exaggerated this can result in mammiform (essentially bull's-eye) contours when adjacent or proximal wells have widely different data values. 3-D maps utilize single-data-point gridding to minimize extrapolation. Most maps use a closely spaced grid with one to a maximum of eight data points (wells) evaluated from each grid node these parameters display anomalies and wide variations on the maps, as opposed to smoothing data. Generated isopach, structure, and other contour maps display this curvature, as opposed to jagged contour lines. ![]() ![]() Contour curvature is distributed rather than concentrated at nodes. The porosity/permeability and other geologic data sets created for this study were gridded by the EarthVision mapping programs using a biharmonic cubic spline algorithm that distributes tension among the grid nodes. All data set references include only approximate X-Y coordinates actual well locations are slightly different. Permeability data were derived from core analyses data distribution are within about 105.5 to 105.6 degrees longitude (X-axis grid dimensions of 26,500 to 33,000 m) and 43.7 to 43.8 degrees latitude (Y-axis grid dimensions of -28,000 to -16,000 m). The 3-D maps of core and well-log porosity represent an area of 105.28 to 105.42 degrees longitude (X-axis grid dimensions of 25,000 to 43,000 m) and 43.4 to 43.5 degrees latitude (Y-axis grid dimensions of -16,000 to -35,000 m). The IRIS workstation had 32 MB of memory and operating system 5.3. The mapping package is owned by Dynamic Graphics Corporation, Berkeley, Calif. EarthVision (EV) version 2.02 program on an IRIS workstation was used to generate contour maps and the 3-D maps illustrating porosity and permeability distribution across the field. Generated maps primarily cover the southern two-thirds of the House Creek field, although geology, geochemistry, and petroleum potential of the entire field was researched. Statistical and graphical distributions of results from thin-section petrographic analyses and well-log and core-porosity and core-permeability data were calculated using Statistical Applications Software (SAS) on a VAX computer, and Microsoft Excel and DeltaGraph programs on Macintosh computers. Microsoft Excel, DeltaGraph, and Canvas statistical and graphics programs on Macintosh computers were used to generate most of the charts and graphs used in figures. Our geologic and geochemical analyses was augmented by other sources of information these include Kerr-McGee Corp., Woods Petroleum Corp., Meridian Oil, Petroleum Information Corp., and State of Wyoming Oil and Gas Conservation Commission.ĬOMPUTER MAPPING AND STATISTICAL METHODOLOGY Meridian Oil Company and Woods Petroleum Corporation provided core analysis and reservoir production and statistical data. Sources of field and well production data include Petroleum Information Corporation's (PI) production data on CD-ROM and Well History Control System databases unless otherwise stated, data are current approximately through July 1993. Geological Survey (USGS) core library in Denver (Higley, 1988) and at the Colorado School of Mines in Golden, Colorado. The Sussex Sandstone core used in this study is located at the U.S. Sources of information include published reports, core and outcrop studies, geochemical analyses of crude oil and core samples, core analyses, petroleum reserve and production data, and well data. ![]() PETROLOGIC/GEOCHEMICAL METHODS OF ANALYSIS. ![]() COMPUTER MAPPING AND STATISTICAL METHODOLOGY.INCLUDED IN THIS SECTION ARE THE FOLLOWING Table of contents | Readme first | Movie readme | Data set readme | Glossary | Geology | Depositional model | Heterogeneity | Diagenetic history | Petroleum geology | 1) East-West porosity slices | 2) North-South porosity slices | 3) Onion views of 3-D images | 4) Horizontal slices of porosity | 5) Horizontal and East-West permeability and porosity slices 3-D Reservoir Characterization of the House Creek Oil Field, Powder River Basin, Wyoming, V1.00
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