各向异性地层随钻电磁波电阻率响应模拟及导向反演方法研究  

Numerical simulation investigation and geological guided inversion method research of electromagnetic wave resistivity instruments for LWD in anisotropic formations

作　　者：陈小磊 刘保银 周军 张中庆 周正志 毛保华 张娟 吴越 CHEN XiaoLei;LIU BaoYin;ZHOU Jun;ZHANG ZhongQing;ZHOU ZhengZhi;MAO BaoHua;ZHANG Juan;WU Yue(CNLC Logging Technology Research Institute,Xi’an 710077,China;Hangzhou Xunmei Technology Co.,Ltd.,Hangzhou 310012,China)

机构地区：[1]中国石油集团测井有限公司测井技术研究院,西安710077 [2]杭州迅美科技有限公司,杭州310012

出　　处：《地球物理学进展》2025年第1期188-198,共11页Progress in Geophysics

基　　金：中国石油集团测井有限公司“随钻地质导向决策分析系统v1.0研发”(CNLC-20223A02)资助.

摘　　要：随钻电磁波电阻率测井仪器是水平井开发应用最广泛的测井工具之一,但是水平井环境中地层各向异性、围岩与边界距离的影响会使得电磁波电阻率测量值失真,导致薄储集层开发普遍存在钻遇率低的难题.本文以中油测井公司的随钻电磁波电阻率工具WPR为例,利用数值仿真方法考察各向异性地层中仪器响应规律,定义并量化了指示地层边界距离、各向异性的特征信号,利用特征信号与分类反演相结合实现随钻电磁波电阻率工具在复杂地层中各向异性、多个边界距离的定量计算.通过实测井应用处理,特征信号能够很好指示地层各向异性和地层边界信息,反演计算的边界距离、水平电阻率、垂直电阻率能够与井眼轨迹、测井曲线响应及井壁成像显示相吻合,验证了方法的合理性.本文方法适用随钻测井仪器获得边界距离、各向异性、地层电阻率参数,能够使常规电磁波电阻率仪器具备边界探测能力,为薄层、复杂油气藏精准地质导向提供了新思路,为钻后储层精细评价提供技术方法,潜在应用价值巨大.The electromagnetic wave resistivity logging tool for Logging While Drilling(LWD)is one of the most widely used logging tools in horizontal well development.However,the anisotropy of the formation and the distance between the surrounding rock and the boundary in the horizontal well environment can cause distortion in the electromagnetic wave resistivity measurement values,leading to the common problem of low drilling rate in the development of thin reservoirs.In this paper,taking the electromagnetic wave LWD resistivity tool of CNLC as an example,the numerical simulation method is used to investigate the instrument response law in the horizontal well formation,and the characteristic signals indicating the boundary distance and anisotropy of the formation are defined and quantified,and the combination of characteristic signals and classification inversion is used to realize the quantitative calculation of the anisotropy and multiple boundary distances of the conventional electromagnetic wave LWD resistivity tool in complex formations.The boundary distance,horizontal resistivity and vertical resistivity calculated by inversion are consistent with the changes in borehole trajectory,the response characteristics of logging curves and the formation occurrence information displayed by borehole imaging,which verifies the rationality of the method.This method is suitable for obtaining boundary distance,anisotropy and formation resistivity parameters from conventional LWD instruments,quantifies the boundary detection ability of conventional electromagnetic wave resistivity instruments,provides a new idea for precise geological guidance of thin-bedded and complex oil and gas reservoirs,and provides a technical method for the fine evaluation of post-drilling formations,and has great potential application value.

关 键 词：随钻测井 电阻率 各向异性 反演 地质导向 

分 类 号：P631[天文地球—地质矿产勘探]