In-situ method for determining pore size distribution, capillary

Details In-situ method for determining pore size distribution, capillary In-situ method for determining pore size distribution, capillary

1984-03-19

1987-02-17

Strecker, Gerard R.

Electricity: measuring and testing

Of subsurface core sample

73153, 324362, 324366, E21B 4902, G01V 302

Patent

active

046442839

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.

REFERENCES:
patent: 2395617 (1946-02-01), Doll
patent: 2802172 (1957-08-01), Mueller et al.
patent: 3902113 (1975-08-01), Bridges et al.
patent: 4359687 (1982-11-01), Vinegar et al.

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