双单轴各向异性地层中定向电磁波测井的井中偏心模型计算及影响因素分析  

Numerical modeling and analysis of directional electromagnetic logging tools in eccentric borehole with doubly uniaxial medium around

作　　者：张雷[1] 王健[1] 陈晶 陈浩[1] 王秀明[1] 肖加奇 

机构地区：[1]声场声信息国家重点实验室中国科学院声学研究所,北京100190 [2]北京吉奥博锐科技有限公司,北京102200

出　　处：《地球物理学进展》2017年第4期1711-1720,共10页Progress in Geophysics

基　　金：国家重大科研装备研制项目"深部资源探测核心装备研发"(ZDYZ2012-1-07-01)资助

摘　　要：本文在考虑电导率单轴各向异性和磁导率单轴各向异性介质的基础上,基于并矢格林函数的谱解形式推导了定向电磁波测井在仪器处于偏心位置时,对双单轴各向异性地层响应的伪解模型,并通过与数值模式匹配方法结果对比验证算法的精度.在此基础上,计算了定向电磁波测井在仪器偏心条件下的旋转测量结果,发现仪器对目标层方位和距离的判断受到仪器偏心的严重影响.此外,本文将旋转测量结果转化成耦合电压矩阵,分析各电压分量对各向异性地层的响应能力受到仪器偏心的影响规律.We develop a pseudoanalytical method for the analysis of directional electromagnetic logging tools in eccentric borehole with cylindrically-layered earth formation,which exhibit permeability and conductivity with uniaxial anisotropy.The pseudoanalytical method is obtained based on the spectral representation of the tensor Green＇s function based on cylindrical Bessel and Hankel eigenfunctions.And the accuracy of numerical result is confirmed by comparing to the results of Numerical Modeling Method（NMM） method.Based on this verification,the responses of Directional electromagnetic logging tools with different azimuth angle are calculated.It is found that the responses of tools to the target formation are seriously affected by eccentric borehole.Further,the coupling voltage matrix is obtained from the measured signal.And the influence due to eccentric borehole on the capability of anisotropy formation evaluation is discussed base on the numerical model.

关 键 词：定向电磁波测井 伪解模型 双单轴各向异性介质 

分 类 号：P631[天文地球—地质矿产勘探]