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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
Abstract: Predicting Permeability With Magnetic Resonance Imaging in the Edwards Limestone/Stuart City Trend, Texas
Hank DeWitt, Mike Globe, Ray Sorenson
ABSTRACT
Determining pore size and pore geometry relationships in carbonate rocks and relating both to permeability is difficult using traditional logging methods. This problem is further complicated by the presence of abundant microporosity (pore size < 62 microns) in the Edwards Limestone. The use of Magnetic Resonance Imaging (MRI) allows for an alternative approach to evaluating the pore types present by examining the response of hydrogen nuclei contained with the free fluid pore space. By testing the hypothesis that larger pore types exhibit an MRI signal decay much slower than smaller pore types, an estimate of the pore type present, (ie) vuggy, interparticle, or micropores, can be inferred. Calibration of the MRI decay curve to known samples with measured petrophysical properties allows for improved predictability of pore types and permeability. The next stage of the analysis involves the application of the calibration technique to the borehole environment using an MRI logging tool to more accurately predict production performance.
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ACKNOWLEDGMENTS AND ASSOCIATED FOOTNOTES
Anadarko Petroleum Corp., Houston, TX
Copyright © 1999 by The Gulf Coast Association of Geological Societies