盆地结构控制下的地层压力-流体-储集性协同演化及控藏作用--以东营凹陷古近系为例  

Co-evolution of formation pressure,fluid,and reservoir property under the control of basin structure and its controlling effect on reservoir accumulation:a case study of Paleogene in Dongying depression

作　　者：王永诗[1] 郝雪峰 安天下 张鹏飞 熊伟 秦峰 Wang Yongshi;Hao Xuefeng;An Tianxia;Zhang Pengfei;Xiong Wei;Qin Feng(Sinopec Shengli Oilfield Company,Shandong Dongying 257001,China;Research Institute of Exploration and Development,Sinopec Shengli Oilfield Company,Shandong Dongying 257015,China)

机构地区：[1]中国石油化工股份有限公司胜利油田分公司,山东东营257001 [2]中国石油化工股份有限公司胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《石油学报》2023年第7期1058-1071,1150,共15页Acta Petrolei Sinica

基　　金：国家科技重大专项(2016ZX05006、2016ZX05006-003);中国石油化工股份有限公司科技攻关项目"济阳东部深层砂砾岩油气富集机制与勘探方向"(P21034-1)资助。

摘　　要：油气成藏是地层压力、流体、储集性及其协同演化作用的结果。东营凹陷成藏动力学过程及油气藏原始状态相对完整,基于古近系地层压力场、流体场、储集物性现今特征及其演化过程研究,建立了东营凹陷地层压力-流体-储集性协同演化模式,明确了其控藏作用。在构造活动、沉积作用的控制下,东营凹陷地层压力经历了"升高—降低—升高"的演化过程,成岩流体性质表现为"酸、碱交替",沉积组构和成岩流体作用控制形成了不同成因类型的有效储层。在断陷盆地结构控制下,东营凹陷陡坡带发育"常压/弱超压—碱/酸—中/低孔(少量高孔)"协同演化模式,洼陷带发育"超压—酸性—中/低孔"协同演化模式,缓坡带发育"常压—弱碱/弱酸—中/高孔"协同演化模式。地层压力、流体和储集性的协同演化模式与断陷盆地结构、油气藏类型及属性的有序分布具有良好的成因对应性,控制了不同类型油气藏的差异富集。陡坡带深层高充满度的岩性气藏、凝析油气藏和洼陷带向陡坡带过渡部位的中—高充满度油藏是有利的预探方向,缓坡带油气运移路径上的岩性-构造油藏及地层油藏是有利的评价增储方向。地层压力、流体和储集性协同演化及其匹配成藏模式可作为断陷盆地油气成藏基本原理的有效补充,是研究油气藏分布有序性差异富集的基础和关键,对于深化陆相断陷盆地油气成藏机理、开展油藏分布规律研究和指导勘探实践具有重要意义。Hydrocarbon accumulation is attributed to the formation pressure,fluid,reservoir property and their co-evolutionary effect.The dynamic reservoiring process and the original state of oil and gas reservoirs in Dongying depression are relatively complete.Based on investigating the current characteristics and evolution process of pressure field,fluid field and reservoir properties of Paleogene,the paper establishes the formation pressure-fluid-reservoir property co-evolutionary model of Dongying depression and makes clear its controlling effect on reservoir accumulation.Under the control of tectonic activity and sedimentation,the formation pressure in Dongying depression has undergone an evolutionary process of"rise-fall-rise".The properties of diagenetic fluid are characterized by acid-alkali alternation.The effective reservoirs of different genetic types have been developed under the control of depositional fabric and diagenetic fluid action.Under the control of fault basin,the development of steep slope belt,depression belt,and gentle slope belt in Dongying depression demonstrate the co-evolutionary mode of"normal pressure/weak overpressure,alkali/acid,and medium/low porosity(less occurrence of high porosity)","overpressure,acid,and medium/low porosity",and"normal pressure,weak alkali/acid,and medium-/high-porosity pores",respectively.The co-evolutionary mode of formation pressure,fluid and reservoir property has a good correspondence with the structure of fault basin,types of oil and gas reservoirs and ordered distribution of properties in terms of genesis,and controls the differential enrichment of different types of oil and gas reservoirs.Lithologic gas reservoirs and condensate oil and gas reservoirs with high hydrocarbon-filling degree in the deep layer of steep slope belt,and reservoirs with medium-high hydrocarbon-filling degree in the transition area from depression belt to steep slope belt indicate a favorable pre-exploration direction;lithological structural and stratigraphic reservoirs on the hydrocarbo

关 键 词：古近系 地层压力 流体 储集性 协同演化 差异成藏 东营凹陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]