国外用地面电法直接找油气田的研究和现状如下: 1.常用电测深法:因为油气藏是地下一种高阻体。气层电阻一般比围岩高10倍,油气层比围岩高3—4倍。所以在地表用电测深法可将油气田圈定出。苏联多采用建立场法和偶极测深法,乌兹别克地球物理联合企业于1972—1975年在布哈拉——希文油气区进行了直接找油工作,成功率几乎达88.5％。为了提高工作效果,在数据处理和解释方面提出了微分变换处理方法。 2.电瞬变法:这是目前美国、加拿大和西欧等国认为在油气勘探上比较有效的方法。该 Foreign direct use of terrestrial electric field to find oil and gas field research and status quo are as follows: 1. Common electric sounding method: Because the reservoir is a kind of underground high resistance body. Gas resistance is generally 10 times higher than the surrounding rock, oil and gas layers 3-4 times higher than the surrounding rock. Therefore, the surface electric sounding method can set the field of oil and gas fields. In the Soviet Union, more field methods and dipole sounding methods were used. Uzbek geophysical joint ventures carried out direct oil exploration in the Bukhara-Xiwen oil and gas region from 1972 to 1975, with a success rate of almost 88.5%. In order to improve the work effect, a differential transformation processing method is proposed in data processing and interpretation. 2. Electric Transient Method: This is the current method considered by the United States, Canada and Western Europe to be more effective in oil and gas exploration. This