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The Electrical Resistivity Log as an Aid in Determining Some Reservoir Characteristics
Archie, G.E. (Shell Oil Co.) Source: SPE Reprint Series, n 55, 2003, p 9-16
ISSN: 0891-0901 CODEN: SPESD8
Publisher: Society of Petroleum Engineers (SPE)
Abstract: The usefulness of the electrical resistivity log in determining reservoir characteristics is governed largely by: (i) the accuracy with which the true resistivity of the formation can be determined; (2) the scope of detailed data concerning the relation of resistivity measurements to formation characteristics; (3) the available information concerning the conductivity of connate or formation waters; (4) the extent of geologic knowledge regarding probable changes in facies within given horizons, both vertically and laterally, particularly in relation to the resultant effect on the electrical properties of the reservoir. Simple examples are given in the following pages to illustrate the use of resistivity logs in the solution of some problems dealing with oil and gas reservoirs. From the available information, it is apparent that much care must be exercised in applying to more complicated cases the methods suggested. It should be remembered that the equations given are not precise and represent only approximate relationships. It is believed, however, that under favorable conditions their application falls within useful limits of accuracy. (5 refs.)
