水平井中随钻电阻率实时确定地层界面方法  

Methods for Real-Time Determination of Formation Boundary with LWD Resistivity Logs in Horizontal Wells

作　　者：陈华 范宜仁 邓少贵 李智强[2] 杨震[1,3] 

机构地区：[1]中国石油大学测井重点实验室/数学与计算科学学院,山东东营257061 [2]中国电波传播研究所,河南新乡453003 [3]中国航天科工集团第三研究院,北京100074

出　　处：《吉林大学学报（地球科学版）》2011年第5期1623-1629,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家油气科技专项项目(2008ZX05035-02);山东省自然科学基金项目(Y2007F25);中央高校基本科研业务费专项项目(09CX04001A)

摘　　要：实时确定地层界面是水平井地质导向钻井中的重要问题之一。考虑到泥浆电阻率、井眼在一定范围内对随钻电磁波影响较小,把三维地层模型简化为一维地层模型,大大减少了正演计算量。利用马奎特方法对其进行了实时反演计算,获得了仪器与地层界面之间的距离。实验表明,所确定的地层界面位置与实际相吻合,能够控制仪器的运行轨迹,使井眼保持在期望的地层内,有效提高了水平井的随钻地质导向能力。Real-time determination of formation boundary is one of the key problems in geological directional drilling of horizontal wells.Considering mud resistivity and borehole have less effect on LWD electromagnetic wave in a certain range,3D formation model was simplified as 1D formation model,the forward computation time can be reduced greatly.The distances between instrument and formation boundary are reconstructed using the real time inversion of marquardt method.Experiment result shows that computed location agree with the actual formation boundaries,so running track of the instrument can be controlled,it can maintain the borehole in a desired geological bed,and further improves the capability of geo-steering in horizontal wells.

关 键 词：测井 随钻电磁波 地质导向 马奎特方法 地层界面 

分 类 号：P631.9[天文地球—地质矿产勘探]