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随着CSAMT法精细结构探测应用需求的日益增多,其相关分辨率的研究逐渐成为研究的热点.在CSAMT三维地质结构数值模拟中,积分方程法因只在异常体处剖分,具有计算速度快、求解精度高等优点.本文首先介绍了三维积分法的原理,然后利用3D积分方程正演程序模拟计算了四种情况下的模型:同一埋深不同体积的模型、同一大小不同埋深的模型、同一大小同一埋深情况下改变其与背景电阻差异大小的模型和两个相同异常体相隔不同距离的模型.除此之外,还设计了一个由岩浆的交代或围岩蚀变作用而在岩浆周围成矿的典型模型.通过这些模型的数值模拟,得出了以下结论:异常体的体积、异常体埋深、异常体与背景电阻率差异对异常响应特征影响明显,并且从数值模拟结果中可以看出CSAMT可以很好的将相距一定距离的多个异常体分辨出来,其对低阻体具有较强的探测能力,而对高阻体的勘探能力相对较弱,这可能对在高阻体边缘寻找金属矿床具有一定的优势.
With the increasing demand for fine structure detection applications in CSAMT, the research on its relative resolution has gradually become a hot research area.In the numerical simulation of CSAMT 3D geological structure, the integral equation method has the advantages of fast calculation speed , The advantages of high precision.This paper first introduced the principle of three-dimensional integration method, and then used 3D integral equation forward programming simulation model of four cases: the same depth of different volume models, the same size of different depth models, In the same depth and depth of the same case, the background resistance was changed with the difference between the size of the model and two identical anomalies separated by different distances from the model.In addition, the design of a replacement by the magma or wall rock alteration in the magma The typical model of the surrounding mineralization.The numerical simulation of these models leads to the following conclusions: The volume of abnormal body, the depth of abnormal body, the difference of abnormal body and background resistivity have significant influence on the abnormal response characteristics, and from the numerical simulation results It can be seen that CSAMT can distinguish multiple anomalies well away from each other with a certain distance, While the exploration capability of high resistivity body is relatively weak, which may have some advantages for finding the metal deposit on the edge of high resistivity body.