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非洲赤道几内亚某水电站坝址区需要了解第四系覆盖层的厚度,并需要查找断层,确定断层的产状等。经过试验,选择了高密度电阻率法作为该区勘探的基本地球物理手段。该区共布置近20条测线,对数据处理和反演后,参照地震折射和钻孔数据,确定了地层划分标准的物性参数。经过仔细的地质解释,得到了覆盖层的厚度和断层分布等成果,并用钻孔验证了分析结果的正确性。该区的勘探实践证明,高密度电阻率法在第四系覆盖下的花岗岩风化带和新鲜岩石这样的地质情况下有很好的勘探效果。
The dam site of a hydropower station in Equatorial Guinea in Africa needs to know the thickness of the Quaternary overburden and need to find the fault and determine the faulting of the fault. After testing, we chose the high-density resistivity method as the basic geophysical method of exploration in this area. There are altogether 20 survey lines in this area. After data processing and inversion, reference is made to the seismic refraction and borehole data to determine the physical parameters of the strata division standard. After careful geologic interpretation, the results of thickness and fault distribution of overburden were obtained, and the correctness of the analysis results was verified by drilling. The exploration practice in this area proves that the high-density resistivity method has a good prospecting effect under geological conditions such as granite weathering zone and fresh rock covered by Quaternary system.