Spectral Induced Polarization Anomalies Obtained With the Dipole-dipole Array over a Polarizable Sphere in a Homogeneous Half-space.
Lou Yangzhong, Wu Zhixun, 1989. "Spectral Induced Polarization Anomalies Obtained With the Dipole-dipole Array over a Polarizable Sphere in a Homogeneous Half-space.", An Overview of Exploration Geophysics in China — 1988, Zhao Jingxiang, Wang Yanjun, Fu Xuexin, Stanley H. Ward
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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 = ρ20/ρ10) 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.