Comprehensive geophysical model for water prospecting in fault fracture zone:A case study of water supply well siting at Gantianba village
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摘要: 乌蒙山贫困缺水区水资源严重缺乏，找水需求大、难度大。为确定了ZK12探采结合井位置，本文首先分析了工区找水环境因素的地层时代、含水介质类型、构造背景、水源条件和水动条件等5个条件；其次，对富水特征的含水岩组、蓄水构造和富水地貌进行研究；最后，重点分析地球物理特征找水因素，介绍了视电阻率联合剖面法、大地电磁测深法、瞬变电磁法、激电测深和地球物理测井等“多方法”应用效果，通过视电阻率、视极化率、衰减度、半衰时等“多参数”，确定断层裂隙水的地球物理特征，建立由浅入深的“多层次”地球物理模式。最终，创新性提出了乌蒙山连片贫困缺水区重点村镇的“多方法、多参数、多层次”地球物理找水模式，克服单一物探方法找水的局限性，精准定井位，对地下水勘查起到示范作用。Abstract: There is a serious shortage of water resources in the poverty-stricken areas of Wumengshan.On one hand, the demand for water supply is large and on the other hand it is difficult to locate the water sources. In this study, the aquifer environmental factors,water-bearing property and geophysical characteristics were comprehensive analyzed. As a result, borehole ZK12 was sited incorporating with the the analysis of fault zone,and the application of the methods including ground resistivity profile, magnetotelluric sounding, transient electromagnetics , IP sounding and geophysical well logging,etc. The geophysical characteristics for determining fault conductive zone was hence conducted by using the geophysical parameters such as apparent resistivity, apparent polarizability, attenuation, half-life failure, apparent visual metal factor, deviation degree, excitation ratio and etc. from which multiple level geophysical model was established. In this paper, we innovatively put forward the "multi-method, multi-parameter and multi-level" geophysical exploration method for locating critical water bearing zones for the resource demand from key villages and towns in Wumengshan with contiguous poverty and water-shortage ,and overcome the limitations of a single geophysical exploration technique in locating the resources and accurate borehole siting. Through examining borehole logging data, it is confirmed that the multiple-method geophysical exploration approach can effectively determine the depth of strata and water-bearing faults, provide experiences for the geophysical exploration for water exploration, as well as play a demonstration role in groundwater exploration.
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