Application of geophysical prospecting and hydrogeological analysis in borehole siting in the karst area:A case study of ZK3 well in Luojiaba,Qianjiang district
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摘要: 物探与水文地质的有机结合可明显提高岩溶区找水定井的命中率.岩溶区的地形地貌、地质构造以及地层岩性对地下水的富集有着决定性的控制作用,有良好岩性配置的低位向斜槽谷区是岩溶找水工作的首要优选靶区;根据测区地质情况和地形条件、目的任务合理选择物探方法,当工作区具有浅覆盖、地下水大埋深和地层电性差异明显等特点时,音频大地电磁法解译成果更为可靠.文章以黔江罗家坝ZK3井为实例,阐述了水文地质调查与物探工作成果在指导岩溶区找水定井中的具体应用,证实了水文地质调查与物探结合的方式在岩溶地区找水定井中的优越性.Abstract: The combined use of geophysical prospecting and hydrogeological analysis can help to improve the success rate of borehole siting in the karst area.The advantage of this method is elaborated in this paper with the case study of well ZK3 in Luojiaba,Qianjiang district.It is confirmed that groundwater occurrence in the karst area is dominated by geomorphology,topography,geological structure and lithology.The low lying syncline with specific lithologic configurations is the primary target area for borehole siting.Proper geophysi-cal techniques can be applied based on the geology and topography of the study area.The interpretation re-sult of audio magnetotelluric method can be reliable when the study area is characterized with the following conditions,such as partially covered,deep groundwater and the presence of large variety in electrical resistiv-ity between stratums.
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