Marine CSEM inversion based on the regularized conjugate gradient method and EM migration

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  • Ueda Takumi
    Institute for Geo-resources and Environment, Geological Survey of Japan, AIST
  • Zhdanov Michael S.
    Department of Geology and Geophysics, University of Utah

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  • 電磁マイグレーションを用いたTikhonov正則化共役勾配法による海洋CSEM法の逆解析
  • デンジ マイグレーション オ モチイタ Tikhonov セイソクカ キョウヤク コウバイホウ ニ ヨル カイヨウ CSEMホウ ノ ギャクカイセキ

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In this paper, we describe an application of the Tikhonov regularization and electromagnetic (EM) migration to an inverse problem of a typical marine controlled-source EM (MCSEM) method used for offshore hydrocarbon exploration.<br>  The 3-D modeling and inversion of MCSEM data is a very challenging problem because of the number of computations required in the case of the multi-transmitter and multi-receiver data acquisition systems used in these surveys.<br>  To overcome this difficulty, we apply Tikhonov regularized inversion along with the Jacobian matrix computed using the principles of EM migration. In order to obtain a stable solution, we use the conjugate gradient method to solve the iterative regularized inversion. The multigrid quasi-linear approximation developed by Ueda and Zhdanov (2006) is introduced for accelerating the computation, in the forward stage of the iterative inversion.<br>  The developed methods are tested on synthetic examples of 3-D MCSEM inversion for the model with the resistive anomaly embedded in the conductive sediment; we have found that the methods can be applied effectively to the interpretation of MCSEM data.<br>

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