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一、引言大地电流法和由它发展起来的大地电磁測探法是利用天然的大地电流和大地电磁場来勘探石油构造和研究大地构造的方法。近年来,由于石油勘探事业发展的需要,很多国家,特別是苏联在发展此方法方面取得了很多新的进展,例如研究高电阻屏蔽层下的結晶基岩面、利用大地电磁場各种頻率的电磁分量的比值进行地层区分等,这就更引起了大家的重視。还附带指出,大地电流的长週期波可以穿透很深的地层,因此研究长週期的(几
I. INTRODUCTION The earth current method and the earth magnetometry method developed by it are the methods of using the natural earth current and the earth’s electromagnetic field to explore the petroleum structure and to study the geotectonic structure. In recent years, due to the need of petroleum exploration, many countries, especially the Soviet Union, have made many new progresses in the development of this method. For example, they study the crystallization-based rock face under high-resistance shielding layer, The ratio of the electromagnetic component stratigraphic distinction, which is even more aroused everyone’s attention. Also incidentally pointed out, the long-period current of the earth current can penetrate deep strata, so the study of long period