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Abstract

Marine controlled source electromagnetic (MCSEM) is an efficient technique for the marine hydrocarbon explorations. Over the past decades, the numerical research on induced polarization (IP) effects in offshore environment is still a intensive topic. Presented here are the results of a 3D new MCSEM forward for IP modeling exercise with the intent of demonstrating the valuable applications of this developed methodology. By using the finite volume method, an analysis on amplitude and phase of electromagnetic field due to the varying IP parameters within the Cole-Cole model is presented. The numerical examples demonstrate that the amplitude and the phase of electromagnetic field due to the IP effects are subtle, and it is difficult to detect the reservoir hydrocarbon object using such subtle amplitude and phase directly in offshore environment. Based on the assumption that most IP phase spectra can be represented by a linear function of the logarithm of frequency, we apply a two-frequency IP phase decoupling technique for MCSEM data interpretation, which is a plausible example. Numerical IP phase decoupled results for a thin reservoir hydrocarbon object demonstrate the efficiency of the two-frequency IP decoupled technique for MCSEM data interpretation.

Keywords

Marine controlled source electromagnetic induced polarization two-frequency decoupled technique finite volume method high resistivity reservoir

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Induced polarization effects of 3D frequency domain MCSEM responses using finite volume method

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