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The AAPG/Datapages Combined Publications Database

West Texas Geological Society

Abstract


The Search Continues into the 21st Century: West Texas Geological Society Fall Symposium, 1998
Pages 181-183

Porosity Quantification in Vuggy Carbonate Reservoirs

Neil Hurley, Robert Zimmermann, David Pantoja

Abstract

Vugs, which are large irregular pores, are a key pore type in many carbonate reservoirs. Conventional logging tools, such as neutron logs, commonly average high values of vuggy porosity with low values of matrix porosity to compute low total porosity readings. When total porosity falls below arbitrary commercial cutoffs, operators may leave bypassed pay behind pipe. The purpose of this study is to quantify vuggy porosity using digital images of core, and to use core results to calibrate vuggy porosity pixel counts obtained from borehole images. The improved porosity analysis that results from this approach compares to the well-known improvement in thin-bed, “low-resistivity pay” analysis provided by borehole images.


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