频率域地-井垂直电磁法响应特征数值模拟  

Numerical Simulation Analysis of Surface-to-borehole Vertical Electromagnetic Responses in Frequency Domain

作　　者：王智[1] 潘和平[1] 骆玉虎 

机构地区：[1]中国地质大学(武汉)地球物理与空间信息学院,湖北武汉430074

出　　处：《测井技术》2015年第1期32-37,共6页Well Logging Technology

基　　金：国家自然科学基金资助项目井中激电地-井方式模型试验(41074086)资助

摘　　要：地-井垂直电磁法是一种在地面用长导线源激发、井中接收的电磁勘探新技术。采用有限单元法对不同的模型进行数值模拟,利用不完全LU分解处理的稳定双共轭梯度算法(BICGSTAB算法)求解最终的线性方程组。分别计算了低电阻率异常体与高电阻率异常体在均匀半空间情况下的频率域地-井电磁的异常响应,从异常体性质、异常体与收发位置关系模拟和分析其特征响应规律,为研究与实际应用地-井垂直电磁法提供参考。Surface-to-borehole vertical electromagnetic method is a new electromagnetic prospecting technology, and the electromagnetic wave is transmitted by long wire source in the ground and received in the borehole. In this paper, we carried out the simulation to different models by finite element method and solved the final linear equation by stable dual-track conjugate gradient algorithm （BICGSTAB algorithm） after the disposition by incomplete LU decomposition. Then we calculated the surfaee-to-borehole electromagnetic abnormal responses of low resistivity anomaly and high resistivity anomaly in frequency domain in the homogeneous half space. By considering of the anomaly＇s property and its relationship with the location of receiver and transmitter, we simulated and analyzed the anomaly;s characteristics of the response pattern, thus provided a reference to the study and application of surface-to-borehole vertical electromagnetic.

关 键 词：地-井垂直电磁法 电磁勘探 有限单元法 不完全LU分解 稳定双共轭梯度 

分 类 号：P631.84[天文地球—地质矿产勘探]