广西隆安县地下水储水构造的地质-地球物理模型及其地球物理响应特征分析

通过物探勘查并结合水文地质资料分析,研究了广西隆安县岩溶石山区断裂带、溶洞、岩溶管道三种储水构造的地质-地球物理模型及其电性响应特征。受构造控制或侵蚀基准面变化的影响,广西隆安岩溶石山区形成多层溶洞及岩溶管道系统,地下水主要赋存于溶洞、管道和构造裂隙中。地球物理上,断裂带及多层洞道系统均表现为纵向低阻条带的电性特征,但储水构造充填物或是水或是泥,难以用电阻率参数加以区分。为提高解译精度,结合工作区的水文地质条件,对物探资料进行细致入微的分析,并在勘察工作中采用在高阻中找低阻、低阻中找高阻的找水定井方法,基本避开了泥质充填的难题,提高了成井率。 

Analysis on geologic-geophysical model and geophysical response of groundwater reservoir in Longan County, Guangxi

Through the combination of geophysical work and the analysis on geological data, the geologic-geophysical models and the electrical characteristics of three groundwater reservoirs, including fault, karst cave and karst pipeline are researched. Controlled by the structure or change in erosion basis, there are multilayered karst cave and karst pipeline system in Longan County. Groundwater mainly stored in karst cave, pipeline and structural fracture. From the standpoint of geophysics, both of the fault zone and multilayered karst channel show longitudinal low-resistant band response. The groundwater reservoir filling with either water or mud that difficult to be distinguished by the resistant parameter, and therefore, we must make a meticulous analysis on the geophysical data and integrate to the hydro-geologic information. In practice, we adopt the method of mapping low resistant in high resistant area and high resistant in low resistant area to determine the location of the well, which avoids the problem of drilling into mudstone filling zone, and increased the water well completion ratio.