Geostatistical Methods for the Study of Pressure Compartments: A Case Study in the Hilight Oil Field, Powder River Basin, Wyoming

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Abstract


Chapter from: M 61: Basin Compartments and Seals Edited by Peter J. Ortoleva Authors: X. Chen, H. P. Heasler, and L. Borgman Methodology and Concepts Published 1994 as part of Memoir 61 Copyright © 1994 The American Association of Petroleum Geologists All Rights Reserved


	Chapter 17 * Geostatistical Methods for the Study of Pressure Compartments: A Case Study in the Hilight Oil Field, Powder River Basin, Wyoming X. Chen* H. P. Heasler L. Borgman University of Wyoming Laramie, Wyoming, U.S.A. * ABSTRACT This chapter introduces the variogram method for analyzing the geometry of pressure compartments. Pressure and hydraulic head data from 192 wells in the Hilight oil field, Powder River basin, Wyoming, were used in this study. Variograms were calculated for various directions. Results indicate that hydraulic head and pressure are spatially correlated, especially in directions parallel to the axes of elongation of compartment cells. The average pressure compartment was estimated via the variogram method to be an ellipse with major and minor axes of 5.3 and 2.7 mi (8.5 and 4.3 km). The major axis trends 15° azimuthally, the minor axis 285°.

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