泥浆侵入对随钻电磁波电阻率测井响应的影响  

Influence of Mud Invasion on Response of Electromagnetic Wave Resistivity Logging While Drilling

作　　者：仵杰[1] 姬玉[1] 成志刚 罗少成 崔玮 姜曼 张妙瑜[1] WU Jie;JI Yu;CHENG Zhigang;LUO Shaocheng;CUI Wei;JIANG Man;ZHANG Miaoyu(Key Laboratory of Ministry of Education for Photoelectric Oil and Gas Logging and Information Detection,Xi'an 710065,Shaanxi,China;Logging Co.,Ltd.,CNPC,Xi'an 710077,Shaanxi,China)

机构地区：[1]西安石油大学光电油气测井与信息检测教育部重点实验室,陕西西安710065 [2]中国石油集团测井有限公司,陕西西安710077

出　　处：《西安石油大学学报（自然科学版）》2020年第1期49-54,61,共7页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金委资助面上项目“水平井随钻阵列感应测井环境动态建模及参数估计”(41474108);陕西省教育厅重点实验室访问学者项目“水平井常规电测井正反演研究”(14JS075);陕西省自然科学基础研究计划项目面上项目“非常规页岩油气层电阻率测量与解释研究”(2018JM4014)

摘　　要：泥浆侵入影响是随钻电磁波电阻率测井工程应用必须考虑的因素。基于COMSOL软件数值计算,分析常见6种侵入模型中四发双收随钻电磁波电阻率测井响应特征。结果表明:在低阻围岩模型中,侵入小于地层电导率或者侵入大于地层电导率而小于围岩电导率时,可以忽略侵入影响;侵入大于地层电导率和围岩电导率时,侵入对4条曲线影响最为明显;高阻围岩模型中,侵入对短源距影响明显,同一源距的高低频率曲线明显分离。6种侵入模型中均出现了“双轨”及“分辨率降低”的现象。通过空间涡流分布特性分析揭示了井中存在侵入时的随钻电磁波电阻率测井响应机理。研究结果为随钻电磁波电阻率测井解释以及井眼影响校正提供了理论依据。Mud invasion is a factor that must be considered in the application of electromagnetic wave resistivity logging while drilling.For six common invasion models,the response characteristics of electromagnetic wave resistivity logging instrument with four transmitters and two receivers were analyzed by using software COMSOL.The simulation results show that:for low resistivity wall rock models,the influence of mud intrusion on logging response can be neglected when the intrusive conductivity is less than the formation conductivity or greater than the formation conductivity and less than the wall rock conductivity;when the intrusive conductivity is greater than the formation conductivity and the wall rock conductivity,the influence of mud intrusion on four curves is most obvious.For high resistivity wall rock models,the influence of mud intrusion on short source distance responses is obvious,and the response curves of high and low frequencies under the same source distance are obviously separated.There are phenomena of"double track"and"resolution reduction"in the logging responses of the six intrusion models.Through the analysis of spatial eddy current distribution,the mechanism of electromagnetic wave resistivity logging response while drilling is revealed when mud intrudes into wells.The research results provide theoretical basis for interpretation of electromagnetic wave resistivity logging while drilling and correction of borehole influence.

关 键 词：随钻电磁波电阻率测井 泥浆侵入 三维数值模拟 

分 类 号：P631.8[天文地球—地质矿产勘探] TE242[天文地球—地质学]