红层区含膏盐地层溶蚀下限探测应用研究

Application Study on the Detection of the Lower Limit of Dissolution of Salt-bearing Stratum in Red Bed Area

本文以成都龙泉山城市森林公园多要素地质调查项目为例,采用钻探、综合测井、高密度电法等工作手段对龙泉山西侧山前区域白垩系灌口组含膏盐地层进行探查,重点关注膏盐溶蚀下限深度及形态,溶蚀下限以上为膏盐溶孔层、溶蚀下限以下为膏盐富集层。结果表明,高密度电法能有效探测膏盐溶蚀下限,对于溶蚀下限深度及形态有较好的探测效果,结合钻探、综合测井能有效标定划分膏盐已溶蚀空间和膏盐富集空间,为城市地下空间规划建设提供地质依据。

Taking the multi-factor geological survey project of Longquanshan Urban Forest Park in Chengdu as an example,drilling,comprehensive logging and high density electrical method are used to probe the salt-bearing stratum of Cretaceous Guankou Formation in the mountain front area on the west side of Longquanshan.Studythe depth and form of the lower limit of salt-dissolution.Above the lower limit of dissolution is the salt-soluble pore layer,below the lower limit of dissolution is the salt-enriched layer.The results show that the high density electrical method can effectively detect the lower limit of dissolution of paste salt,and has a good detection effect on the depth and form of the lower limit of dissolution.Combined with drilling and comprehensive logging,it can effectively demarcate the dissolved space of paste salt and the enriched space of paste salt,providing geological basis for urban underground space planning and construction.