水平井缝洞储层双侧向测井响应数值模拟分析  

Numerical simulation analysis of dual laterolog response of fracture-cavity reservoir in horizontal wells

作　　者：王磊 胡松[2] 齐真真 WANG Lei;HU Song;QI Zhenzhen(Huabei Geosteering&Logging Company Sinopec Matrix Copporation,Zhengzhou 450006,China;Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China)

机构地区：[1]中石化经纬有限公司华北测控公司,郑州450006 [2]中国石化石油勘探开发研究院,北京100083

出　　处：《非常规油气》2024年第5期20-27,共8页Unconventional Oil & Gas

基　　金：国家自然科学基金企业联合基金项目“深层高温高压流体测井岩电响应机理及识别方法技术”(U19B6003-04-03-03);国家科技重大专项“超深层碳酸盐岩缝洞性储层测井精细评价技术”(2017ZX05005-005-005)。

摘　　要：缝洞是碳酸盐岩储集体最主要的储集空间,正确认识缝洞储层双侧向测井响应规律,对于利用双侧向测井资料准确评价缝洞具有重要作用。应用三维有限元法结合COMSOL软件对等效缝洞地层模型进行双侧向测井响应数值模拟,分析了水平井条件下洞穴尺寸、洞穴充填物和基岩对双侧向测井响应的影响。分析结果表明:1)对于单一充填洞穴,不同角度过井眼洞穴双侧向电阻率测井响应特征完全一致;2)随着洞穴半径增大,深侧向和浅侧向测井视电阻率值迅速下降,且深侧向电阻率值大于浅侧向的,两者呈明显正差异;3)深侧向和浅侧向测井响应均随基岩电阻率增大而增大;随着洞穴半径增大,浅侧向测井响应随基岩电阻率变化的幅度变小;4)对于双层充填洞穴,深浅双侧向电阻率在填充物界面处受井斜角的影响较大。深侧向电阻率在低阻介质一侧随井斜角增大而增大,在高阻介质一侧随井斜角增大而减小。浅侧向电阻率在高阻介质中随井斜角增大而减小,而在低阻介质中,浅侧向电阻率受洞穴尺寸和井斜角的影响较复杂。水平井条件下,深、浅双侧向电阻率都无法区分不同填充物电阻率,而是反映介于2种填充物电阻率之间的单一介质电阻率。Caves are the main reservoir space of fracture-cavity carbonate reservoirs.Due to the strong heterogeneity of carbonate reservoirs,it is essential to correctly understand the response law of dual laterolog of fracture-cavity reservoir for the accurate evaluation of fractures and caves by using dual laterolog data.Based on the equivalent model of fracture-cavity formation,numerical simulation of dual laterolog response was conducted by using the 3D finite element method combined with COMSOL software,and the effects of cave size,cave filling compound and matrix on dual laterolog response were analyzed under horizontal well conditions.The analysis results show that:1)The characteristics of dual laterolog responses are completely consistent for caves filled by a single layer when the borehole passes through at different angles;2)With the increase of cave radius,the apparent resistivities of deep and shallow lateral logging decrease rapidly,and the deep lateral resistivity value is significantly higher than the shallow lateral resistivity value;3)The deep and shallow lateral logging responses increase with the increase of the matrix resistivity,the increased amplitude of shallow laterolog response with matrix resistivity becomes smaller;4)For caves filled by double-layer,the deep and shallow dual laterolog resistivities are greatly affected by well inclination angles at the filling interfaces;the deep lateral resistivity increases with the increase of well deviation angle in the low resistivity medium side,and decreases with the increase of well inclination angle in the high resistivity medium side;the shallow lateral resistivity decreases with the increase of well inclination angle in high resistivity medium,while the shallow lateral resistivity is affected by cave sizes and well inclination angles in low resistivity medium,which becomes more complex.Under the condition of a horizontal well,the resistivities of deep and shallow dual laterolog can not distinguish the resistivity of different filling compounds but refl

关 键 词：水平井 缝洞储层 双侧向测井 数值模拟 

分 类 号：P631.84[天文地球—地质矿产勘探]