CSAMT法静态位移效应的模拟研究分析

Model analysis of static shift in CSAMT method

在CSAMT法的实际测量中,视电阻率曲线总会存在一些静态现象.而静态问题又一直是电磁测深领域一个棘手的问题,它直接影响到电磁测量结论的解释.能否正确识别静态是实际测深工作能否顺利进行的一个关键,同时也关系到测深工作的成败.因此,分析静态现象的特征,了解静态存在的现象显得尤为重要.本文通过数值模拟分析各种情况下静态现象的影响因素,从静态体的尺寸、埋深和电阻率等方面进行了讨论,论证静态效应现象存在的因素及其响应特征,具有较高的研究价值.

Because of the existence of shallow inhomogeneous bodies, static shift occurs in magnetotelluric sounding curves, which makes the interpretation of CSAMT data very difficult,or even impossible. It is very important to identify static shift in the interpretation of CSAMT data. In this paper, the effect factor and the character of static shift in some instance is analysed by calculating models with different size, depth and resistivity, therefore it has preferable application value.