大地电磁测深法在慈页1井定位中的应用

摘要

在灰岩发育地区进行钻探作业时经常会遇到溶洞,给钻探带来不小的风险.为了减小钻探风险,可以采用探测深度大、对溶洞识别能力强的大地电磁测深法进行溶洞探测,确定钻孔的有利位置.本文以慈页1井的钻孔定位研究为例,通过在井场开展大地电磁测深工作,查明井场下方可能有溶洞发育的区域,最终确定了孔位的有利位置,在实际钻进过程中并未遇到溶洞发育段,说明通过大地电磁测深法布置的孔位合理,保证了钻探的安全施工.%Drilling in limestone areas often meets karst caves, which may be a big risk.For the purpose of reducing the risk, the magnetotelluric sounding method can be used to detect the karst cave so as to determine the right drilling location.This paper describes the selection of right location of Ciye No.1 well.By conducting magnetotelluric sounding in the well site, the area containing karst cave under the well site can be detected.Ciye No.1 well was placed in the area without karst cave, and hence it doesn't meet karst cave during drilling.So, the place of Ciye No.1 well selected by magnettelluric sounding is right.The right place ensures the safety of the drilling.