柴达木盆地尕斯库勒油田E_(3)^(1)油藏隔夹层特征、成因及分布  

Characteristics,Genesis and Distribution of Interlayers in E_(3)^(1) Reservoir of Gasikule Oilfield,Qaidam Basin

作　　者：于慧敏[1] 宋彦辰 彭渝婷 刘波[1] 李童 石开波[1] Yu Huimin;Song Yanchen;Peng Yuting;Liu Bo;Li Tong;Shi Kaibo(Peking University,Beijing 100871,China)

机构地区：[1]北京大学,北京100871

出　　处：《特种油气藏》2021年第4期79-87,共9页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金企业创新发展联合基金项目“海相深层碳酸盐岩层系油气成藏机理与开发方法”(U19B6003)。

摘　　要：储层中隔夹层发育情况制约着剩余油的分布,针对柴达木盆地尕斯库勒油田E_(3)^(1)油藏面临长期水驱开发后注气提高剩余油采收率的难题,以尕斯库勒油田E_(3)^(1)油藏Ⅳ-3—Ⅳ-5小层为例,通过对岩心、测井和测试分析等综合研究,明确隔夹层类型特征及成因,建立隔夹层识别标准,在此基础上刻画了隔夹层的空间展布特征。研究表明:尕斯库勒E_(3)^(1)油藏主要发育泥质和钙质2类隔夹层,以泥质隔夹层为主,其成因主要受高频旋回所控,钙质夹层分布相对较少,多形成于胶结作用。基于构型层次结构分析,尕斯库勒E_(3)^(1)油藏隔夹层可划分为小层间隔层、单砂体间夹层和单砂体内夹层3个层级。在对GR、SP、AC、R_(LLD)等测井曲线归一化的基础上建立了泥质隔夹层和钙质夹层的定量识别标准。小层间隔层连续性好,基本在全区均有分布,厚度大;单砂体间夹层连续性较差,仅在局部地区连续分布;单砂体内夹层零星分布,厚度最薄。该研究成果可为尕斯库勒E_(3)^(1)油藏气驱开发提供一定的地质依据。The interlayers developed in the reservoir restrict the distribution of remaining oil.In view of the difficulty in enhancing recovery efficiency of remaining oil by gas injection after long-term water-flooding development in E_(3)^(1) reservoir of Gasikule Oilfield,Qaidam Basin,in the study case of Ⅳ-3 to Ⅳ-5 sublayers in E_(3)^(1) reservoir,Gasikule Oilfield,a comprehensive study was conducted on core,logging,test and analysis to identify the types,characteristics and genesis of interlayers,establish the standards for interlayer identification,and characterize spatial distribution characteristics of interlayer on these standards.It was found in the study that argillaceous and calcareous interlayers were mainly developed in Gasikule E_(3)^(1) reservoir,with argillaceous interlayer dominated,whose genesis was mainly controlled by high-frequency cycles,and calcareous interlayer was distributed relatively less and mostly formed by cementation.Based on the analysis of stratigraphic architecture and stratigraphic texture,the interlayer of Gasikule E_(3)^(1) reservoir can be divided into three levels:interlayer between sublayers,interlayer between single sandbodies and interlayer in single sandbody.A quantitative identification standard of argillaceous interlayer and calcareous interlayer was established based on the normalization of log curves of GR,SP,AC and R_(LLD).The interlayer between sublayers was thick,high in continuity,and basically distributed in the whole area;the interlayer between single sandbodies was poor in continuity and continuously distributed in some places;the interlayer in single sandbody was sporadically distributed,with the thinnest thickness.The study results provide a certain geological basis for gas-flooding development of Gasikule E_(3)^(1) reservoir.

关 键 词：隔夹层 层次结构分析 测井识别 展布规律 下干柴沟组 尕斯库勒油田 

分 类 号：TE321[石油与天然气工程—油气田开发工程]