高密度电法探查地质构造在赤道几内亚的应用
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摘要
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 investigating requirements of Djiploho Hydroelectric Station in Equatorial Guinea are the thickness of overlay of Quaternary and faults and fault properties.After tests,high density electrical method is chosen as basic geophysical tool for exploration.There about 20 lines are laid out for acquisition.By processing and inversion of acquired data,the standard of rock physical properties for categorizing the strata is determined with references of seismic refraction and borehole data.The results of the thickness of overlay and distribution and properties of faults are obtained by the geological interpretation and verified by the borehole data.The exploration and practice of Djiploho Hydroelectric Station proved that high density electrical method is a good approach under geological condition of granite and its weathered zone with Quaternary unconsolidated formation overlay.
The investigating requirements of Djiploho Hydroelectric Station in Equatorial Guinea are the thickness of overlay of Quaternary and faults and fault properties.After tests,high density electrical method is chosen as basic geophysical tool for exploration.There about 20 lines are laid out for acquisition.By processing and inversion of acquired data,the standard of rock physical properties for categorizing the strata is determined with references of seismic refraction and borehole data.The results of the thickness of overlay and distribution and properties of faults are obtained by the geological interpretation and verified by the borehole data.The exploration and practice of Djiploho Hydroelectric Station proved that high density electrical method is a good approach under geological condition of granite and its weathered zone with Quaternary unconsolidated formation overlay.
引文
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[2]董浩斌等.高密度电法的发展与应用[J].地学前沿,2003,(1):171~176.
[3]沈方铝等.高密度电阻率法在隧道勘察中的应用[A].中国地球物理学会第二十三届年会论文集[C].2007.
[4]赵光辉.高密度电法勘探技术及其应用[J].矿产与地质,2006,(2):166~168.
[5]姚道平等.高密度电法在灰岩地区勘察中的应用[J].工程地球物理学报,2008,(4):449~452.
[6]阮珏等.高密度电法在玉溪市九龙池公园西侧山体地质灾害调查中的应用[J].工程地球物理学报,2008,(4):475~479.
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