In-situ induced polarization method for determining formation permeability
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United States of America Patent
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May 10, 1988
Issued Date -
N/A
app pub date -
Oct 31, 1986
filing date -
Mar 19, 1984
priority date (Note) -
Expired
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Abstract
An in-situ method of determining the pore size distribution, capillary pressure curve, and permeability of a formation using induced polarization logging measurements. The induced polarization (IP) voltage decay curve is measured opposite the formation of interest and the voltage decay curve is decomposed into a series of relaxation times related to the pore size distribution. The capillary pressure curve and the permeability are approximated from the pore size distribution. The measurements can also be made in the frequency domain using various frequencies to obtain the variation in phase shift with frequency. The variation in phase shift with frequency can be correlated with previous core measurements to obtain the pore size distribution, capillary pressure curve and formation permeability.
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