Influence of neighboring rock on cased crosswell electromagnetic logging
Yu Xin-juan1,2,3, Liu Di-ren1,2, Cai Ming1,2, Yu Bing1,2, Xu Wei1,2, Zheng Zhan-shu1,2
1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education (Yangtze University), Jinzhou, Hubei 434023, China;
2. College of Ueophysics and Oil Resource, Yangtze University, Jingzhou, Hubei 434023, China;
3. Daqing Drilling and Engineering Corporation Daqing Oilfield Limited Company, CNPC,Daqing, Heilongjiang 163411, China
Abstract：On the basis of electromagnetic field theory,this paper first builds the heterogeneous casing cross-well model including borehole,casing,cement sheath,neighboring rock and targets in a condition of the heterogeneous casing cross-well low-frequency electromagnetic field,and then analyzes the effect of neighboring rock on cross-well electromagnetic logging(CWEML) by finite element method.The result shows that the effect of neighboring rock is bigger as the target stratum is thinner;and the change of electromotive force is larger when neighboring rock resistivity(RsRt)is lower.These numerical results are helpful for correction of the effect of neighboring rock in CWEML.
