ISSN 1009-6248CN 61-1149/P 双月刊

主管单位:中国地质调查局

主办单位:中国地质调查局西安地质调查中心
中国地质学会

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    CSAMT的静校正应用——联合反演法

    Application of Static Correction CSAMT——Joint inversion method

    • 摘要: CSAMT方法应用在地下近地表存在电性横向不均匀体时,在双对数坐标系中视电阻率曲线会出现沿着视电阻率轴平行移动的现象,称之为静态效应。静态效应对深部电性结构处理解释结果影响重大,需对其进行合适的校正。笔者介绍了目前通常使用的几种静态校正方法,并且分析了各方法的优缺点。对比各种方法,我们选择了时间域的瞬变电磁法和频率域的可控源电磁测深做联合反演,用精度较高的瞬变电磁数据校正受静态影响的可控源测深数据。在甘肃某地进行的铅锌矿CSAMT勘探中,应用联合反演法对可控源测深做静态校正,处理结果与实际地质情况吻合较好。

       

      Abstract: In using the CSAMT method,when electrical property is laterally inhomogeneous beneath the surface,the apparent resistivity line shall have a parallel movement along the axis of apparent resistivity, which is called static shift.The static shift greatly affects the interpretation result of deep electrical property structure.In this situation,we should correctit.In this paper,we have introduced several methods of static correction and discussed their advantages and disadvantages.After comparison of various methods,we have chosen the TEM in time domain and CSAM T in frequency domain to perform the joint inversion and used the high precision calibration of TEM data to correct the CSAMT data affected by static effect.In prospecting a plumbum and zinc mine in Gansu,we applied the method of joint inversion to make static correction,and the result is in good agreement with the actual geological conditions.

       

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