Broadband resistivity interpretation

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter

Reexamination Certificate

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C324S341000

Reexamination Certificate

active

07659723

ABSTRACT:
Resistivity measurements are made at a plurality of frequencies. An asymptotic high-frequency limit is determined and the electrical efficiency is estimated as a ratio of the high frequency resistivity limit to the low frequency resistivity. From the electrical efficiency, petrophysical parameters of a rock such as porosity and water saturation can be estimated.

REFERENCES:
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patent: 4626773 (1986-12-01), Kroeger et al.
patent: 5475309 (1995-12-01), Hong et al.
patent: 5811973 (1998-09-01), Meyer, Jr.
patent: 6150822 (2000-11-01), Hong et al.
patent: 7228903 (2007-06-01), Wang et al.
D.C. Herrick et al.; “Electrical Efficiency: A Pore Geometric Model for the Electrical Properties of Rocks”, SPWLA 34th Annual Logging Symposium, Paper HH, Jun. 13-16, 1993, pp. 1-20.
W. H. Meyer; “Field Measurements of Resistivity Dispersion Using Two Frequency MWD Propagation Resistivity Tools”, Petrophysics, vol. 41, No. 6, Nov.-Dec. 2000, pp. 492-502.
S.M. Haugland; “Frequency Dispersion Effects on LWD Propagation Resistivity Measurements”, SPE 96596, 2005 SPE Annual Technical Conference and Exhibition, Dallas, Texas, Oct. 9-12, 2005, pp. 1-14.

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