综合电法勘探在岩溶勘查中应用研究——以安徽池州市为例

Study on the Application of Comprehensive Electric Prospecting in Karst Exploration:A Case Study in Chizhou City,Anhui Province

岩溶是工程勘查中重点关注的对象之一,以往常用高密度电阻率法对其进行探测。考虑到单一物探方法具有一定的局限性和多解性,为进一步改善探测效果,采用综合物探方法对于实际探测具有重要意义。以池州市贵池区某地块的岩溶勘查为例,考察采用高密度电法和瞬变电磁法进行综合探测的方法技术。现场探测结果显示,高密度电法对地层电阻率的纵向分辨能力强,瞬变电磁法对地层电阻率的横向分辨率较好,两种方法相互补充,体现了综合物探的优越性。钻探验证结果进一步表明了综合物探结果的可靠性。

Karst is a paramount study object in engineering exploration,and high density resistivity method is the common method in Karst exploration.Subject to limitations and multiplicity of solutions using a single geophysical prospecting method,comprehensive geophysical prospecting method can improve the detection effect and has practical significance.This paper discuss two comprehensive electrical prospecting,concluding high density electrical method and transient electromagnetic method,to detect the karst at a certain point of Guichi district in Chizhou city.The exploration results show that the former has strong vertical resolution for formation resistivity,and the latter has good horizontal resolution for formation resistivity.The two methods can confirm for each other and represent the superiority of comprehensive geophysical exploration.Meanwhile,the exploration results can further demonstrate the reliability of the comprehensive geophysical results.