松辽盆地大安油田葡萄花油层特低渗储层成岩相特征与孔隙演化  

Diagenetic facies and porosity evolution of ultra-low permeability reservoir in Putaohua Reservoir in Da’an Oilfield in Songliao Basin

作　　者：何庆斌[1,2] 张继红 李金凤[2] HE Qingbin;ZHANG Jihong;LI Jinfeng(School of Petroleum Engineering,Northeast Petroleum University,Daqing 163318,China;Honggang Oil Production Company,PetroChina Jilin Oilfield Company,Songyuan 138000,China)

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163318 [2]中国石油吉林油田公司红岗采油厂,吉林松原138000

出　　处：《大庆石油地质与开发》2023年第2期1-12,共12页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“松辽盆地致密油开发示范工程”(2016ZX05001-002)。

摘　　要：松辽盆地大安油田葡萄花油层特低渗透储层成因及孔隙演化特征缺乏定量的研究。利用铸体薄片、扫描电镜、电子探针、X射线衍射和全岩、物性、压汞等定性、定量资料对葡萄花油层成岩作用类型、成岩相进行定量研究并恢复各成岩相孔隙演化过程。结果表明:大安油田葡萄花油层经历了早成岩A期压实成岩、早成岩B期胶结成岩、中成岩A期溶蚀成岩和胶结交代成岩4个阶段;机械压实、伊利石和混层黏土胶结、碳酸盐胶结破坏原生孔隙,绿泥石和高岭石环边胶结有利于原生孔保存,长石和火山岩屑溶蚀改善物性;大安油田葡萄花油层可划分为长石溶蚀粒内溶孔相、黏土环边胶结残余粒间孔相、硅质胶结粒间溶孔相、方解石胶结晶间微孔相和黏土杂基充填晶间微孔相5种成岩相,各成岩相主要成岩作用类型、成岩强度影响孔隙组合,造成储层的强烈非均质性;长石溶蚀粒内溶孔相和黏土环边胶结残余粒间孔相储层物性最好,是研究区最有利储层。研究成果为大安油田葡萄花油层效益开发和整体建产提供地质依据。There are few quantitative studies on genesis of ultra-low reservoir and porosity evolution in Putaohua Reservoir in Da’an Oilfield. Quantitative research on diagenesis types and diagenetic facies of Putaohua Reservoir is performed by using qualitative and quantitative parameters of cast thin section, SEM, electronic probe, XRD and whole rock, physical properties and mercury injection, and porosity evolution processes of all diagenetic facies are restored. The result shows that Putaohua Reservoir in Da’an Oilfield has experienced 4 diagenesis stages including compaction of early diagenesis stage A, cementation of early diagenesis stage B, and dissolution and metasomatism of middle diagenesis stage A. Mechanical compaction, illite and mixed layered clay cementation and carbonate cementation destroyed primary porosity, while chlorite and kaolinite rim cement improved primary porosity preservation, and dissolution of feldspar and debris improved reservoir property. There are 5 kinds of diagenetic facies in Da’an Oilfield including feldspar dissolution intragranular dissolved pore facies,clay rim cement residual intergranular pore facies, siliceous cement dissolved pore facies, calcite cement filling intercrystaline micro-pore facies and clay matrix filling intercrystaline micro-pore facies. The main diagenesis type and diagenesis strength of different diagenetic facies influence porosity combination, causing high reservoir heterogeneity. Feldspar dissolution intragranular dissolved pore facies and clay rim cement residual pore facies have best reservoir property, being the most favorable reservoir in studied area. The study provides geologic basis for beneficial development and overall productivity construction of Putaohua Reservoir in Da’an Oilfield.

关 键 词：成岩作用 特低渗砂岩 成岩相定量划分 孔隙演化 葡萄花油层 大安油田 松辽盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]