电阻率各向异性多参数逐级反演与应用  

Multi-Parameter Step-by-Step Inversion of Resistivity Anisotropy and Application

作　　者：胡文亮 张国栋 刘保银 罗健 魏晓晗 HU Wenliang;ZHANG Guodong;LIU Baoyin;LUO Jian;WEI Xiaohan(Shanghai Branch of CNOOC Co.Ltd.,Shanghai 200335,China;Hangzhou Xunmei Technology Co.Ltd.,Hangzhou,Zhejiang 310012,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335 [2]杭州迅美科技有限公司,浙江杭州310012

出　　处：《测井技术》2023年第2期183-188,共6页Well Logging Technology

基　　金：中海石油(中国)有限公司上海分公司七年行动计划科技项目“西湖凹陷西部地区勘探开发关键技术研究”(CNOOC-KJ 135 ZDXM 39 SH01)。

摘　　要：随钻电磁波电阻率测井应用广泛,已成为海上斜井、水平井的必测项目之一。但受储层各向异性、钻井液侵入等因素的综合影响,随钻电磁波电阻率测井仪器测量的电阻率失真,给饱和度定量评价带来不确定性。以斯伦贝谢公司随钻电磁波电阻率测井仪器ARC675为例,利用矢量有限元方法进行仪器响应仿真模拟,考察仪器在各向异性、侵入等情况下的测井响应特征,进一步利用各向异性-侵入逐级反演的方法实现多参数综合反演,获得水平和垂直电阻率、钻井液侵入深度与各向异性等参数。利用上述方法对某大斜度实钻井进行随钻电磁波电阻率逐级反演处理,结果显示,实测视电阻率、反演电阻率与相邻直井同层位随钻电磁波电阻率相比,电阻率相对误差由56%降低至10%,可为储层饱和度精确评价提供地层真实电阻率依据。Electromagnetic resistivity logging while drilling is widely used,which has become a required item in the inclined and horizontal offshore wells.However,due to the comprehensive influence of reservoir anisotropy,drilling fluid invasion and other factors,the resistivity measured is distorted,which brings uncertainty to the quantitative evaluation of saturation.Taking Schlumberger electromagnetic resistivity logging tool ARC675 as an example,the simulation is carried out using vector finite element method,to investigate the logging response characteristics under conditions of anisotropy and invasion.Multi-parameter synthetic inversion is realized by step-by-step anisotropy and invasion inversion.Based on this,horizontal and vertical resistivity,invasion depth of drilling fluid and anisotropy are obtained.The above step-by-step inversion method is applied in a highly deviated well,and the results show that the relative error is reduced from 56%to 10%by comparing the measured resistivity and inversion resistivity with the resistivity of the same layer in the adjacent vertical well.This result shows that the method above can provide relatively true formation resistivity for accurate evaluation of reservoir saturation.

关 键 词：随钻测井 电阻率 各向异性 侵入 逐级反演 

分 类 号：P631.84[天文地球—地质矿产勘探]