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Spectral Induced Polarization Anomalies Obtained With the Dipole-dipole Array over a Polarizable Sphere in a Homogeneous Half-space.

By
Lou Yangzhong
Lou Yangzhong
Chinese University of Geosciences (Wuhan), Wuhan, Hubei.
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Wu Zhixun
Wu Zhixun
No. 1 Exploration Geophysics Research Party of the Ministry of Geology and Mineral Resources, Anhui.
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Published:
January 01, 1989

Abstract

Based on the exact solution to the problem of a conductive sphere in a homogeneous half-space excited by a point source, the higher approximation calculation method of spectral induced polarization (SIP) anomaly due to a polarizable sphere with the dipole-dipole array is presented. From calculated results for the models with different electrical properties and geometry, we learned the following: apparent phase φa and apparent chargeability ma are the parameters reflecting the intensity of the IP anomaly and they have the same features of spatial distribution. The time constant can provide new information and should be the main paramater studied in SIP surveys. Among the factors related to the apparent time constant τa, the resistivity ratio of a polarizable body to its host (μ20 = ρ2010) is the most important. An empirical expression relating τa to μ,20 is given. τa and ma decrease with increase of burial depth of a polarizable body. Because the decreasing rate of τa is smaller than that of ma, τa is more significant in searching for deep-seated bodies than is ma.

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Contents

Society of Exploration Geophysicists Geophysical References Series

An Overview of Exploration Geophysics in China — 1988

Zhao Jingxiang
Zhao Jingxiang
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Wang Yanjun
Wang Yanjun
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Fu Xuexin
Fu Xuexin
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Stanley H. Ward
Stanley H. Ward
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Society of Exploration Geophysicists
Volume
3
ISBN electronic:
9781560802662
Publication date:
January 01, 1989

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