张量CSAMT数据处理技术初步研究与示范应用

面对大深度和三维探测,标量CSAMT(controlled source audio-frequency magnetotellurics)已显力不从心,而张量CSAMT正逐渐成为研究热点。在前人研究基础上,笔者就张量CSAMT数据处理方面提出Mohr圆分析和传统坐标旋转两种处理技术,并首次创新性地使用我国自主研发的综合电法仪开展了张量CSAMT示范应用。结果表明:Mohr圆分析和传统坐标旋转法相结合应用效果良好,可定性挖掘地下地质体的纵向和横向构造特征,主轴方位的视电阻率和阻抗相位与目标体对应良好,并且电阻率反演结果与钻孔等地质资料综合分析对建立试验区的地质地球物理模型是有益的。

Preliminary Study and Demonstration of Tensor CSAMT Data Processing Technology

Scalar CASM T is inadequate to the face of great depth and three‐dimensional detection ;while tensor CSAM T is becoming a research focus .On the basis of previous studies ,two kinds of tensor CSAM T processing technologies are proposed ;which are Mohr analysis and the traditional coordinate rotation .By innovative use of the integrated electrical instruments developed in China for the first time , we demonstrate the application of tensor CSAM T .The results show that through Mohr analysis and traditional coordinate rotation ,the vertical and horizontal structure of underground geological bodies can be qualitatively analyzed ; apparent resistivity and impedance phase in principal axis orientation correspond with the targets ; and the comprehensive analysis of resistivity inversion and drilling information are profitable for the establishment of geological‐geophysical models on the test area .