3D finite element modeling of marine controlled-source electromagnetic fields using locally refined unstructured meshes

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Yixin Ye, Li Yuguo, Y. Liu, Gang Li, Haiyan Yang
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引用次数: 2

Abstract

We present a 3D forward modeling algorithm of marine controlled-source electromagnetic (CSEM) fields using finite element method based on unstructured meshes. As the unstructured mesh is incorporated, the algorithm can easily accommodate complex structures, such as dipping interfaces and rough topography. Secondary coupled-potential formulation of Maxwell's equations allows to avoid the singularities introduced by the sources. The primary electromagnetic fields excited by electric dipole source in layered isotropic media are derived from the semi-analytical formulas based on Schelkunoff potentials. To improve the accuracy and efficiency of the algorithm, we propose an effective local mesh refinement strategy, where the elements near the receiver locations and in the abnormal areas are refined using the volume constraints. We validate the finite element code against a 1D and 2D reservoir model and study the performance of the local mesh refinement strategy. The Canonical disc model illustrates the utility of the finite element method for 3D CSEM modeling. The bathymetry model study shows that the seafloor topography gives an important response which needs to be reproduced by numerical modeling to avoid the misinterpretation of measurements.
海洋可控源电磁场的局部精细非结构化网格三维有限元建模
提出了一种基于非结构化网格的海洋可控源电磁场三维正演建模算法。由于加入了非结构化网格,该算法可以方便地适应倾斜界面和粗糙地形等复杂结构。麦克斯韦方程组的二次耦合势公式可以避免源引入的奇点。利用基于舍尔库诺夫势的半解析公式,推导了层状各向同性介质中电偶极子源激发的一次电磁场。为了提高算法的精度和效率,我们提出了一种有效的局部网格细化策略,利用体积约束对靠近接收器位置和异常区域的单元进行细化。我们针对一维和二维油藏模型验证了有限元代码,并研究了局部网格细化策略的性能。典型圆盘模型说明了有限元法在三维CSEM建模中的实用性。测深模型研究表明,海底地形是一个重要的响应,需要通过数值模拟来再现,以避免测量结果的误读。
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来源期刊
地球物理学报
地球物理学报 地学-地球化学与地球物理
CiteScore
3.40
自引率
28.60%
发文量
9449
审稿时长
7.5 months
期刊介绍:
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