Induced polarization of the 1630-monogenetic dome, Furnas volcano, São Miguel Island, Azores archipelago
TL;DR: In this paper, the authors performed a 3D tomography of the electrical conductivity and normalized chargeability of the 1630-monogenetic dome located inside the caldera of Furnas, a quiescent stratovolcano in the Eastern side of Sao Miguel Island (Azores volcanic archipelago, Atlantic Ocean).
About: This article is published in Journal of Volcanology and Geothermal Research.The article was published on 2021-12-01. It has received None citations till now. The article focuses on the topics: Dome (geology).
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TL;DR: The usefulness of the electrical resistivity log in determining reservoir characteristics is governed largely by: (1) 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; and (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 as mentioned in this paper.
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.
6,411 citations
1,386 citations
TL;DR: In this paper, the induced polarization in shaly sands has been modeled in terms of two mechanisms: clay counterion displacement and membrane blockage, and the resulting equations can be used to determine shaliness, brine conductivity, and oil saturation from in-phase and out-of-phase conductivities.
Abstract: Equations have been developed that relate induced polarization (IP) in shaly sands to measurable petrophysical parameters. The induced-polarization process has been modeled in terms of two mechanisms: clay counterion displacement and membrane blockage. The resulting equations can be used to determine shaliness, brine conductivity, and oil saturation from in-phase and out-of-phase conductivities. Laboratory measurements have confirmed the IP dependence on these variables, as well as on temperature.
481 citations
TL;DR: The low-frequency conductivity response of water-saturated packs of glass beads reflects a combination of two processes, which corresponds to the polarization of the mineral/water interface coating the surface of the grains and the Maxwell-Wagner polarization associated with accumulation of the electrical charges in the pore space of the composite medium.
339 citations