辽河西部凹陷欢喜岭地区扇三角洲前缘储层非均质性表征  

Heterogeneity of Fan-Delta Front Reservoir in Huanxiling Area of Liaohe Western Depression

作　　者：王珏[1] 陈欢庆[1] 周新茂[1] 杜宜静[1] 李顺明[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《地质科技情报》2017年第1期188-196,共9页Geological Science and Technology Information

基　　金：国家科技重大专项(2016ZX05010-001)

摘　　要：研究区位于辽河油田某蒸汽驱试验区内。以该地区于楼油层扇三角洲前缘砂体为研究对象,综合400口井测井资料、6口取心井资料及多种测试资料,对该地区储层非均质性进行了定性及定量的精细表征,分析了非均质性的主控因素及分布规律,探讨了非均质性对储层开发的影响,并提出了相应的开发调整建议。结果表明,研究区夹层发育泥质夹层、物性夹层及成岩胶结夹层,夹层频率介于0.052~0.17层/m;隔层发育泥质隔层,平均厚度为1.52~3.84m;主力油层单层平均渗透率变异系数介于0.59~1.01之间,平均渗透率级差介于55.51~462.42之间,平均突进系数介于2.37~3.75之间,整体属于中-强非均质性储层;砂体类型包括水下分流河道、河口砂坝、水下分流河道间砂、水下分流河道间泥及前缘席状砂,垂向叠置模式包括连通型、弱连通型及不连通型,平面分布模式包括连片状及条带状。非均质性整体受控于沉积环境与沉积动力作用的演化过程,如发育于可容纳空间变小时期的砂体,由于河道侧向迁移及下切能力强,非均质性较弱。根据非均质性表征结果,提出了调剖注汽、分层注汽等开发调整建议,为进一步扩大蒸汽驱试验及剩余油挖潜提供了坚实的地质依据。The fan-delta front reservoir heterogeneity on Yulou oil layer,Liaohe oilfield is studied based on the analysis of core data and well logging.Through identification of interlay in single wells,calculation of heterogeneity parameters and statistics on sandbody scale,the reservoir heterogeneity has been characterized in detail.The controlling factor and distribution of heterogeneity has been analyzed,and the development adjustment has been suggested.The result indicates that medium to strong heterogeneity of major reservoir is developed in the study area,incuding argillaceous interlayers,physical interlayers and rockforming cement interlayers,with the interlayer frequency between 0.052 and 0.17.The variation coefficient of permeability is between 0.59 and 1.01,permeability ratio is between 55.51 and 462.42,and permeability max-mean ratio is between 2.37 and 3.75.The types of sandbody include underwater distributary channel,mouth bar,underwater distributary inter-channel sand,underwater distributary inter-channel mud and sheet sand,showing three types of vertical stacking models and two types of plane distribution models.The heterogeneity is mainly controlled by sedimentary environment and evolution.For example,the layer developed in the stage of low accommodation space,such as YI12 layer,shows weak heterogeneity because of migration and incision of distributary channel.According to the result of heterogeneity characterization,profile control gas injection and stratified gas injection has been suggested as development adjustment plan.The study provides theoretical basis for further study on expanding steam drive and exploring remaining oil.

关 键 词：辽河西部凹陷 蒸汽驱试验区 扇三角洲前缘 储层非均质性 

分 类 号：TE122.221[石油与天然气工程—油气勘探]