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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 66 (1982)

Issue: 5. (May)

First Page: 569

Last Page: 569

Title: Sandstone Stratigraphy Using Core Description, Dipmeter Curves, and Other Available Logs: ABSTRACT

Author(s): Rusty Frisinger

Article Type: Meeting abstract

Abstract:

Smaller reservoir targets and enhanced recovery projects demand exacting stratigraphic interpretation to evaluate economic feasibility of a field. The stratigraphic interpretation of a formation requires an accurate geologic model and detailed rock information. Although detailed information may be obtained from cores, cores are not available in large portions of the reservoir rock being studied. Electric logs are available in most wells, but few logs provide the detailed information required for stratigraphic study. The dipmeter, electromagnetic propagation tools, and microresistivity devices can provide detailed data. Only the dipmeter makes high resolution measurements on different sides of the borehole and provides the orientation of the information in space. Using the dipmeter, the interpretations obtained can be projected into the region away from the borehole. The dipmeter has been capable of providing high resolution data from the resistivity curves for the last decade, but until recently only a few have used the curves.

The synergism of geologic models, dipmeter resistivity curves, core data, and other logs is an invaluable aid to the accurate interpretation of the stratigraphy of sand and shale units. Examples discussed include: a fluvial point bar of the Fort Union Formation in the Wind River basin, Wyoming; a Shannon Sand marine bar facies; and an analysis of the internal characteristics of a Tensleep Formation reservoir in an eolian system. These examples show that once the model is established and the dipmeter resistivity curve response is understood, the stratigraphy and some of the heterogeneous characteristics of these reservoirs can be more easily described.

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