裂缝性地层阵列感应测井响应特征  

Response Characteristics of Array Induction Logging in Fractured Formation

作　　者：郭洪波[1,2,3] 郭云龙 周磊 曹富华[4] GUO Hongbo;GUO Yunong;ZHOU Lei;CAO Fuhua(Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,China;R&D Center for Ultra-Deep Complex Reservoir Exploration and Development,CNPC,Korla,Xinjiang 841000,China;Engineering Research Center for Ultra-Deep Complex Reservoir Exploration and Development,Xinjiang Uygur Autonomous Region,Korla,Xinjiang 841000,China;School of Geosciencess,China University of Petroleum(East China),Qingdao,Shandong 266580,China)

机构地区：[1]中国石油塔里木油田公司,新疆库尔勒841000 [2]中国石油天然气集团有限公司超深层复杂油气藏勘探开发技术研发中心,新疆库尔勒841000 [3]新疆维吾尔自治区超深层复杂油气藏勘探开发工程研究中心,新疆库尔勒841000 [4]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《测井技术》2025年第1期17-30,共14页Well Logging Technology

基　　金：国家自然科学基金-联合基金项目-重点支持项目“水平井随钻电磁波远探测前视测井机理与成像方法”(U23B2086)。

摘　　要：裂缝性地层裂缝尺度各异、测井响应正演难度大、量化裂缝参数困难且表征难度大。地层微电阻率扫描成像(Formation Micro Scanner Image,FMI)测井和双侧向测井是识别和评价裂缝性地层的重要手段,但阵列感应测井裂缝响应模拟难度大且响应特征尚不明确。系统开展了裂缝性地层阵列感应测井响应特征研究,提出了一种新的简化模型快速正演方法。首先,将三维严格正演模型等效为一维偶极子发射与点接收的层状模型,分别建立单一裂缝、多条裂缝和等间距平行板状缝这3种模型;其次,借助简化模型快速正演方法实现了裂缝性地层的子阵列及合成信号响应;最后,对比了不同裂缝模型响应特征,进而对比阵列感应测井对裂缝性地层的响应差异。结果表明:在单一低阻裂缝情况下,裂缝倾角越小、基岩与裂缝电阻率的对比度及裂缝张开度越大,响应幅值越大且变化越明显;阵列感应测井对高阻裂缝响应不敏感;具有多条裂缝时,裂缝数量会影响浅探测曲线,裂缝较近时合成曲线无法分辨裂缝数量。这些响应规律为识别裂缝性储层提供了新的研究思路和理论依据。The fracture scale of fractured formation is different,the forward modeling of logging response is difficult,and the quantification and characterization of fracture parameters are difficult.Formation microscanner image(FMI)logging and dual laterolog logging are important means to identify and evaluate fractured formation,but the fracture response simulation of array induction logging is difficult and the response characteristics are not clear.In this paper,the response characteristics of fractured formation array induction logging are studied systematically,and a new simplified model fast forward modeling method is proposed.Firstly,the three-dimensional strict forward modeling model is equivalent to the layered model of one-dimensional dipole emission and point reception,and three models of single crack,multiple crack and parallel plate crack with equal spacing are established respectively.Secondly,the subarray response of fractured strata and the synthetic signal response are realized by the simplified model fast forward modeling method.Finally,the response characteristics of different fracture models are compared,and the difference of response of array induction logging to fractured formation is investigated.The results show that in the case of a single low-resistance fracture,the smaller the crack inclination,the larger the contrast between bedrock and crack resistivity and the larger the crack opening,the larger the response amplitude and the more obvious the change.Array induction logging is insensitive to high resistance fracture response.When there are multiple cracks,the number of cracks will affect the shallow detection curve.When the cracks are close,the synthetic curve cannot distinguish the number of cracks.These response rules provide a new research idea and theoretical basis for identifying fractured reservoirs.

关 键 词：裂缝 阵列感应测井 模型简化 响应特征 

分 类 号：P631.84[天文地球—地质矿产勘探]