时频电磁法三维自适应有限元正演及含油储层灵敏度分析研究

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中图分类号：P631 文献标识码：A DOI：10. 13810/j. cnki. issn. 1000-7210. 20240417

Abstract：The time ⁃ frequency electromagnetic method is widely used in the field of oil and gas exploration. Three⁃dimensional forward modeling can obtain the electromagnetic response of the three⁃dimensional electrical structure of subsurface，serving as an essential tool for qualitative interpretation of electromagnetic data and ob⁃ servation system design for electromagnetic exploration，as well as the basis for three ⁃ dimensional inversion. This paper utilizes a three ⁃ dimensional adaptive finite element forward modeling algorithm of the time ⁃ fre⁃ quency electromagnetic method to solve the second⁃order partial differential equations that the electric field sati⁃ sfies and estimate the posterior error based on the continuity conditions of the electromagnetic field. This guides the adaptive refinement of the mesh，achieving efficient and accurate simulation of the electromagnetic re⁃ sponse. Compared to traditional forward modeling methods，this approach effectively reduces computational load while ensuring accuracy. Numerical examples validate the accuracy and efficiency of the algorithm . Addi⁃ tionally，simulations of oil and gas models are conducted to analyze the sensitivity of time⁃frequency electromag⁃ netic responses to reservoirs. This study provides significant reference for oil and gas exploration with the help of the time⁃frequency electromagnetic method.

Keywords：time ⁃ frequency electromagnetic method，three ⁃ dimensional forward modeling，adaptive finite ele⁃ ment，oil and gas exploration，electromagnetic response

李宗杰，蔡盼盼，李清坤，等 . 时频电磁法三维自适应有限元正演及含油储层灵敏度分析研究［J］. 石油地球物理勘探，2025，60（3）：806‑816.

LI Zongjie，CAI Panpan，LI Qingkun，et al. Three ⁃ dimensional adaptive finite element forward modeling oftime ⁃ frequency electromagnetic method and sensitivity analysis of oil ⁃ bearing reservoirs［J］. Oil GeophysicalProspecting，2025，60（3）：806‑816.

0 引言

时频电磁法是一种应用广泛的地球物理方法，其原理是通过在地面激发电磁场，观测时间域或频率域的电磁场响应，从而推断地下介质的电性结构。（剩余16127字）