【摘要】 利用地震、钻井等资料,从烃源岩、储层、生储盖组合、圈闭及输导条件等方面对辽东湾坳陷油气成藏条件进行了系统的分析。研究表明,辽东湾坳陷烃源岩总体上呈北北东向展布,发育沙河街组三段、一段、东营组三段3套烃源岩,其中沙河街组三段是主力烃源岩层段;储集体分为基岩储集体和碎屑岩储集体,储集条件优越;生储盖层组合方式主要有自生自储式、下生上储式和新生古储式;输导系统以断层为主,同时断层把彼此不相接触、时空跨度较大的烃源岩与不整合面联系起来,构成断层-不整合输导系统;圈闭形成于古近纪沙河街组和东营组沉积时期,多为同沉积构造圈闭,单纯的岩性圈闭发现较少。油气藏在平面上主要分布在郯庐断裂带附近,具有南北分带、东西分块的特点,低凸起构造带是油气主要富集带;纵向上具有从北向南逐渐变新,埋藏深度变浅的特点。更多还原

【Abstract】 A study on hydrocarbon accumulation conditions in the Liaodong Bay depression is performed based on analysis of source rock,reservoirs,reservoir-seal assemblage,traps and carrier systems.The results show that there are three sets of source rocks,including the 3rd and 1st member of the Shahejie Formation and the 3rd member of the Dongying Formation.Among them,the 3rd member of the Shahejie Formation is the major source rock.Both basement and clastic reservoirs exist and are of high quality.The main types of source-reservoir-cap rock assemblages include indigenous generation and accumulation,,lower-generation and upper-accumulation and generation-in-the-new and accumulation-in-the-old.Faults dominate the carrier system and connect source rocks and unconformities which are separate in time and space,forming a fault-unconformity carrier system.Traps were mainly developed during the deposition of the Paleogene Shehejie and Dongying Formations.They are mostly syndepositional structural traps and are rarely pure lithologic traps.Horizontally,oil and gas pools distribute along the Tan-Lu Fault zone and are featured by zonation in N-S direction and segmentation in E-W direction.Low salient structures are rich in oil and gas.Vertically,oil/gas-bearing layers become younger and shallower from north to south.更多还原