非均匀网格有限差分法大地电磁测深法正演模拟  

Magnetotelluric forward modeling using non-uniform gridfinite difference method

作　　者：章惠[1] 杜利 魏广仁 隋少强[1] 张慧 刘文辉 ZHANG Hui;DU Li;WEI Guangren;SUI Shaoqiang;ZHANG Hui;LIU Wenhui(New Energy Research Institute,Sinopec Star Petroleum Co.,Ltd.,Beijing 100083;College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450000,Henan)

机构地区：[1]中国石化新星石油公司新能源研究院,北京100083 [2]华北水利水电大学地球科学与工程学院,河南郑州450000

出　　处：《长江大学学报（自然科学版）》2024年第4期63-70,共8页Journal of Yangtze University(Natural Science Edition)

基　　金：中国石油化工集团有限公司科技部项目“岩溶热储非震精细描述技术及应用”(JP20011)。

摘　　要：为解决有限差分法大地电磁正演模拟中模拟精度与计算效率之间的矛盾,采用非均匀网格有限差分进行了大地电磁响应计算。基于二维大地电磁方程,推导出非均匀网格剖分下的TM极化模式的大地电磁方程的差分格式。通过均匀半空间模型和低阻异常体模型的正演模拟,验证了非均匀网格差分法的正确性,非均匀网格差分法可以准确反映出复杂模型的大地电磁响应特征,识别异常体分布范围。In order to solve the contradiction between simulation accuracy and computational efficiency in finite difference magnetotelluric forward modeling,the non-uniform grid finite difference method is used to calculate the magnetotelluric response.Based on the two-dimensional magnetotelluric equation,the difference scheme of TM polarization mode magnetotelluric equation under non-uniform grid subdivision is derived.The correctness of the non-uniform grid difference algorithm is verified by the forward simulation of the uniform half-space model and the low resistance anomaly model.The non-uniform grid difference algorithm can accurately reflect the magnetotelluric response characteristics of the complex model and identify the distribution range of the anomaly body.

关 键 词：大地电磁测深 正演模拟 有限差分法 非均匀网格 

分 类 号：P631.325[天文地球—地质矿产勘探] TE132.14[天文地球—地质学]