瞬变电磁快速三维正演  

Fast 3D forward modeling of transient electromagnetic

作　　者：李瑞雪[1] 王鹤[1,2] 席振铢[1,2] 蒋欢[1] 刘愿愿[1] LI Ruixue WANG He XI Zhenzhu JIANG Huan LIU Yuanyuan(School of Geosciences and Info-Physics, Central South University, Changsha 410083, China Marine Mineral Exploration Technology and Equipment Institute, Central South University, Changsha 410083, China)

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]中南大学海洋矿产探测技术与装备研究所,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2016年第10期3477-3482,共6页Journal of Central South University:Science and Technology

基　　金：大洋"十二五"重大项目(DY125-11-R-03);国家自然科学基金资助项目(41304090);深圳市战略新兴产业发展专项资金资助项目(CXZZ20120618165608947)~~

摘　　要：为了提高瞬变电磁法三维正演计算速度,一方面,采用矢量有限单元法与积分方程法相混合,使24维单元矩阵的阶数降低到12维,减少大型稀疏矩阵的计算时间,同时增强边界条件的连续性,避免出现伪解;另一方面,引进Flow-through Hankel transform快速计算技术,解决不同收发距的贝塞尔函数重复计算的问题,进一步节省计算时间。研究结果表明:引入矢量有限单元法的混合法和Flow-through Hankel transform快速计算技术不但能保证3维计算精度,而且能提高计算速度。In order to enhance the speed of 3D transient electromagnetic forward modeling, two new techniques were employed. One is combining vector finite-element method with integral equation method to decrease the order of elemental matrix from 24 to 12, which can save much time of the computing large sparse matrix, keep the continuity of boundary conditions, and avoid spurious solutions; the other is adopting flow-through Hankel transform technique to resolve the exhausted time problem through calculating. Bessel function repeatedly while resetting the offsets every time. The results show that the two new techniques not only keep the accuracy of 3D TEM forward technique but also speed up the calculation.

关 键 词：瞬变电磁法 3维正演 FLOW-THROUGH HANKEL transform 矢量有限单元法 

分 类 号：P319.12[天文地球—固体地球物理学]