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本文阐述在大地电磁测深工作中,用有限单元法,模拟计算京津唐地区二维地质构造的大地电磁响应。 文章前部分,论述了用有限单元法正演二维大地电磁测深曲线的原理及其数学公式推导。文章后部分,根据两条测线实测的大地电磁测深结果并结合其它地球物理探测资料,给出了两个二维剖面模型,并计算了两种极化的视电阻率曲线。两条实测剖面分别是横切唐山地震带的马兰峪—柏各庄剖面及横过北京地区北北东构造走向的文化营—王辛庄剖面。
This paper describes the use of finite element method to simulate the earth’s electromagnetic response in the 2D geologic formations in Beijing-Tianjin-Tangshan area in the work of MTEP. In the first part of the article, the principle and mathematical formula deduction of two-dimensional geomagnetic sounding curve with finite element method are discussed. In the latter part of the paper, two 2D cross-section models are given according to the results of the geomagnetic sounding measured by two measuring lines combined with other geophysical exploration data. The apparent resistivity curves of the two kinds of polarization are calculated. The two measured sections are respectively the Malanyu-Baigezhuang section crossing the Tangshan seismic zone and the Wang Xinzhuang section, a cultural camp that traverses the North-East East tectonics in Beijing.