渤海湾盆地临南洼陷古近系沙河街组源-储组合类型与致密(低渗)砂岩油差异富集模式  

Source rock-reservoir assemblage types and differential oil enrichment model in tight(low-permeability)sandstone reservoirs in the Paleocene Shahejie Formation in the Linnan Sub-sag,Bohai Bay Basin

作　　者：韩载华 刘华[1,2] 赵兰全 刘景东 尹丽娟[3] 李磊[1] HAN Zaihua;LIU Hua;ZHAO Lanquan;LIU Jingdong;YIN Lijuan;LI Lei(State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao,Shandong 266580,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao,Shandong 266071,China;Exploration and Development Research Institute,Shengli Oilfield Branch Company,SINOPEC,Dongying,Shandong 257100,China)

机构地区：[1]深层油气全国重点实验室中国石油大学(华东),山东青岛266580 [2]海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071 [3]中国石化胜利油田分公司勘探开发研究院,山东东营257100

出　　处：《石油与天然气地质》2024年第3期722-738,共17页Oil & Gas Geology

基　　金：国家自然科学基金项目(42272151)。

摘　　要：为了揭示渤海湾盆地临南洼陷古近系沙河街组致密(低渗)砂岩油的差异富集机理,在依据空间配置和岩性组合划分源-储组合类型的基础上,综合利用测井、录井、试油和岩心分析测试资料,对不同源-储组合类型含油性及其供烃条件、储集条件、输导条件和运聚动力进行了分析,建立了致密(低渗)砂岩油差异富集模式。结果显示:①研究区存在源-储共生型(夹层型、互层型)、源-储紧邻型(源上型、源间型和源下型)、源-储间隔型(源下型)3大类6亚类源-储组合,对应3种致密(低渗)砂岩油富集模式。②源-储共生型具有“强供烃-强动力-高效充注-储集控富”模式,供烃条件和运聚动力最优,油气通过孔缝高效充注,储层含油性最好;相较于互层型,砂体厚度制约了夹层型油气富集规模。③源-储紧邻型具有“较强供烃-差异动力-联合输导-多元控富”模式,供烃条件较好,运聚动力变化大,油气通过孔缝-断裂-砂体联合输导,优先充注物性和孔隙结构好的储层,储层含油性较好;亚类中,源间型供烃条件和运聚动力优于源上型和源下型,含油性最好。④源-储间隔型具有“弱供烃-弱动力-断砂输导-输储控富”模式,供烃和运聚动力较弱,断裂、砂体组成的有效输导通道和优质储层发育对于油气富集至关重要,含油性整体较差。This study aims to reveal the differential oil enrichment mechanisms of tight(low-permeability)sandstone reservoirs in the Paleogene Shahejie Formation in the Linnan Sub-sag,Bohai Bay Basin.Initially,we categorize the source rock-reservoir assemblages in the Linnan Sub-sag based on their spatial distribution and lithologic combination.The analysis on oil-bearing properties,hydrocarbon supply,reservoir storage spaces,conduit system,and migration and accumulation dynamics of various source rock-reservoir assemblages is carried out using an integration of data of logging,well tests,production tests and core analysis and tests.Accordingly,the differential oil enrichment model is established for tight(low-permeability)sandstone reservoirs.The results indicate that the source rock-reservoir assemblages in the study area can be categorized into three types,which can be further divided into six subtypes:the source-reservoir coexistence type,including interbedded and intercalated sub-types;the source-reservoir adjoining type,comprising three distinct subtypes with reservoirs located above,between,or below source rocks;and the source-reservoir separation type,including a subtype with reservoirs located below source rocks.These types correspond to three oil enrichment model of the tight(low-permeability)sandstone reservoirs.The source-reservoir coexistence type exhibits an oil enrichment model featuring“a strong hydrocarbon supply,strong migration and accumulation dynamics,efficient charging,and reservoir-controlled oil enrichment.”Specifically,this type boasts the optimal hydrocarbon supply conditions,the strongest migration and accumulation dynamics,and efficient hydrocarbon charging via pores and fractures,all of which contribute to the most favorable oil-bearing properties.Compared to that of the intercalated subtype,the hydrocarbon enrichment scale of the interbedded subtype is restricted by sand-body thicknesses.The source-reservoir adjoining type manifests an oil enrichment model characterized by a comparatively

关 键 词：富集条件 富集模式 源-储组合 致密(低渗)砂岩油 古近系 临南洼陷 渤海湾盆地 

分 类 号：TE122.3[石油与天然气工程—油气勘探]