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可控源音频大地电磁法近几年来成功地应用于矿产资源、油气资源、地热资源、煤炭资源勘查及工程环境等勘探中,但是地表不均匀体产生的静态效应问题是当前该方法急需解决的一个技术难题。针对这一问题提出了两种静态校正新方法,方向滤波法和带相位的滑动滤波法,并具体说明了这两种算法的设计思想。通过建立地表存在不均匀体时的地电模型,正演模拟合成了存在静态效应的电阻率及阻抗相位断面图,使用方向滤波法和带相位的滑动滤波法分别对它们进行静态校正,基本可以消除地表不均匀体的影响。然后对新疆某地存在静态效应的CSAMT测量原始数据断面图应用这两种方法进行静态校正,取得了较好的效果。
In recent years, the controllable source audio-frequency geomagnetic method has been successfully applied to the exploration of mineral resources, oil and gas resources, geothermal resources, coal resources exploration and engineering environment. However, the static effect caused by surface heterogeneity is the urgent need to be solved by this method A technical problem. Aiming at this problem, two new static correction methods, directional filtering method and sliding filtering method with phase are proposed. The design ideas of these two algorithms are described in detail. Through the establishment of the geoelectric model when the surface is inhomogeneous, the resistivity and impedance phase cross-sections with static effect are synthesized by forward modeling, and their static correction can be performed respectively by using the directional filtering method and the phase-based sliding filtering method Eliminate the effects of surface inhomogeneities. Then, the static correction of CSAMT raw data cross-section with static effect in a certain place in Xinjiang is carried out, and good results are achieved.