渝东南岩溶储水构造高密度电阻率法异常特征

通过对75条高密度电阻率法勘探测线及57眼钻孔验证情况的总结分析,研究渝东南地区岩溶储水构造的高密度电法异常特征.渝东南岩溶储水构造划分为三类地质模型:浅表层岩溶带、溶洞及岩溶管道、构造裂隙.根据渝东南地区找水高密度电法成果统计总结出该地区常见的四类高密度电法异常形态:浅表层横向条带状低阻异常、UV型低阻异常、团状或囊状低阻异常、串珠状低阻异常,每一类异常对应1~3种岩溶储水构造地质模型.高密度电法是渝东南岩溶山区找水的首选物探方法,总结地区勘探经验及合理解译高密度异常后推荐孔位可以提高岩溶石山地区找水的成井率.

High density electrical prospecting anomaly analysis of water-bearing structure in karst area of southeast Chongqing

Through the summarization of 75 high density resistivity survey lines and 57 drill holes, the authors studied high density e-lectrical prospecting anomaly of water-bearing structure in karst area of southeast Chongqing. Water-bearing structure in karst area of southeast Chongqing may be divided into three kinds of geological models:corrosion fissure, karst cave and karst conduit, and structur-al fissure. According to the statistical results of high density electrical prospecting anomaly in karst area of southeast Chongqing, the au-thors divided them into four groups:low resistance stripe in surface layer, UV type low-resistant anomaly, the paste or cystic low resist-ance anomaly, and the beaded low resistivity, with each kind of anomaly corresponding to the 1~3 type of water-bearing structure in geological model of the karst area. High density resistivity method is the preferred method for geophysical water exploration in karst are-as of southeast Chongqing. The authors summed up the experience of regional exploration and revealed that reasonable interpretation of high density anomaly after the recommendation of drill hole in karst areas can avoid the problem of mudstone filling and increase the well completion ratio.