综合物探方法在碳质灰岩库区岩溶渗漏带调查中的应用研究  

Application research of integrated geophysical methods to Karst seepage investigation in carbonaceous limestone reservoir area

作　　者：郑智杰[1,2] 张伟[1,2] 曾洁[1,2] 甘伏平[1,2] ZHENG Zhi-jie;ZHANG Wei;ZENG Jie;GAN Fu-ping(Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 514004, China;Karst Dynamics Laboratory, ML R＆GZAR, Guilin 514004, China)

机构地区：[1]中国地质科学院岩溶地质研究所,桂林541004 [2]国土资源部/广西岩溶动力学重点实验室,桂林541004

出　　处：《地球物理学进展》2017年第5期2268-2273,共6页Progress in Geophysics

基　　金：中国地质调查局项目(DD20160300);中国地质科学院岩溶地质研究所所控项目(121237128100244);中国地质科学院院控基金项目(YYWF201643)联合资助

摘　　要：桂林市全州县洛潭水库常年处于不能正常蓄水状态,水量少,水位浅,为了查明桂林市全州县洛潭水库岩溶渗漏带发育的位置,为帷幕灌浆提供依据,笔者采用综合物探方法对库区进行研究,研究结果表明:受碳质灰岩影响,高密度电法及跨孔电阻率透视对低阻异常体辨识度降低,高密度电法低阻反演异常体范围变大,α2装置对低阻异常体的分辨率小于β装置,跨孔电阻率透视在低阻异常段电阻率等值线容易形成圈闭现象;在碳质灰岩地区,地震折射法、地震反射法及微动法受碳质影响小,采用该三方法组合的方式能较好的确定岩溶渗漏带发育的位置及分布范围;1号岩溶渗漏带分别通过7-2测线515~534 m测点段及大坝钻孔ZK1~ZK2,7-2测线534~592 m测点段为1号岩溶渗漏带隐患区;2号渗漏带分别通过7-2测线655~672 m测点段及大坝钻孔ZK7~ZK8,钻孔ZK6~ZK7为2号岩溶渗漏带隐患区,1、2号渗漏带主要为裂隙渗漏.The Luotan reservoir in Quanzhou County,Guilin City,China,is continually in a state of water shortage,with shallow water levels and little water available for use. Investigations are needed to assess zones of Karst leakage and provide a basis for curtain grouting in the reservoir. This paper uses integrated geophysical prospecting methods to study the reservoir area. The results show the following.Electrical resistivity techniques,including those with a cross-hole resistivity perspective,are affected by the carbonaceous limestone in the region and have a decreased ability to recognize low-resistivity bodies. The inversion of electrical resistivity data for low resistivity anomalies can easily be amplified. The resolution of the α2 device on a low resistivity abnormal body is smaller than that of the βdevice. Within a low resistivity anomaly,resistivity contours for a cross-hole resistivity perspective can easily form trap phenomena. In the carbonaceous limestone area,the locations and distribution of Karst seepage zones can be assessed well by seismic refraction,seismic reflection and microtremor methods,which are less affected by carbonaceous media. The first Karst leakage zone passes through the 515 - 534 m section of line 7-2 and the dam drillings from ZK1 to ZK2. A hidden zone of Karst leakage in the first Karst area is found from 534 to 592 m along survey line 7-2. The second Karst leakage zone passes through the 655 - 672 m section of line 7-2 with the dam drillings from ZK7 to ZK8. The hidden zone of Karst leakage in the second Karst area passes through from ZK6 to ZK7.The first and second leakage zones mainly consist of fracture seepage.

关 键 词：综合物探 碳质灰岩 岩溶渗漏 洛潭水库 裂隙渗漏 

分 类 号：P631[天文地球—地质矿产勘探]