Fictitious wave domain modelling and analysis of marine CSEM data

Fictitious wave domain modelling and analysis of marine CSEM data
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海洋 CSEM 数据的虚拟波域建模和分析

DOI:
10.1093/gji/ggz288
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发表时间:
2019-10
影响因子:
2.8
通讯作者:
Du Zhijun
Du Zhijun
中科院分区:
地球科学2区
文献类型:
--
作者:
Lu Jie;Li Yuguo;Du Zhijun

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在虚拟时间域中模拟海洋可控源电磁场(CSEM)响应是一种新的方法,它有利于在虚拟波域(FWD)中全面探索电磁场的扩散特性。反射、折射、绕射和透射等弹性波传播分析中的概念,可以应用于CSEM资料的FWD解释中。在本文中,我们使用高阶时域有限差分(FDTD)算法模拟海洋CSEM响应在虚拟时域和扩散频域。采用复频移完全匹配层(CFS-PML)边界条件进行FDTD建模。我们展示了CFS-PML边界条件的性能,并验证了高阶FDTD代码在FWD与半空间海水模型和频域与1-D正则水库模型。我们调查和分析的电磁场的传播特性在FWD,在那里我们应用波传播的概念来解释海洋CSEM数据。海洋CSEM数据相关的波和场的传播之间的相似性,通过几个1-D到3-D的数值例子证明。
Modelling marine controlled-source electromagnetic (CSEM) responses in the fictitious time domain is a novel approach, which facilitates the full exploration of EM diffusive properties in the fictitious wave domain (FWD). Concepts, such as reflections, refractions, diffractions and transmissions, which are used for the analysis of elastic wave propagation can thus be adopted in FWD for interpreting CSEM data. In this paper, we use a high-order finite difference time domain (FDTD) algorithm for modelling marine CSEM responses in both the fictitious time domain and the diffusive frequency domain. A complex frequency shifted perfectly matched layer (CFS–PML) boundary condition is adopted to the FDTD modelling. We demonstrate the performance of the CFS–PML boundary condition and validate the high-order FDTD code in the FWD with the half-space sea water model and in the frequency domain with the 1-D canonical reservoir model. We investigate and analyse the propagation characteristics of electromagnetic fields in the FWD, where we apply wave propagation concepts to interpret marine CSEM data. Similarities between wave and field propagations relevant for marine CSEM data are demonstrated through several 1-D to 3-D numerical examples.
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