Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1986-10-31
1988-05-10
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
324362, 324373, G01V 320, G01V 338
Patent
active
047438541
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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Dakhnov, V. N. et al., Well Logging by Means of Induced Polarization (Electrolytic Logging), Promislovaya Geofizika pp. 46-82, 1952, Translation by Geo. V. Keller in The Log Analyst, Nov.-Dec. 1967, pp. 3-18.
Latishova, M. G., Relationship Between Induced Polarization and the Permeability of Sands, Trudi Mne., 12, Gostoptekizadat (1953) pp. 25-79.
Worthington et al., Relevance of Induced Polarization to Quantitative Formation Evaluation, Marine and Petroleum Geology, 1984, vol. 1, Feb. pp. 14-26.
Vinegar Harold J.
Waxman Monroe H.
Shell Oil Company
Strecker Gerard R.
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