辽东湾坳陷辽西凹陷北部和中部洼陷油气成藏条件  

Hydrocarbon Accumulation Conditions of North Sub-Sag and Central Sub-Sag in Liaoxi Sag,Liaodong Bay Depression

作　　者：杨宝林[1,2] 叶加仁[1,2] 刘一茗[1,2] 单超[1,2] 薛海琴[3] 

机构地区：[1]中国地质大学构造与油气资源教育部重点实验室,武汉430074 [2]中国地质大学资源学院,武汉430074 [3]中国地质大学江城学院,武汉430200

出　　处：《新疆石油地质》2015年第1期25-29,共5页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2011ZX05023-001-001)

摘　　要：对辽西凹陷北部洼陷与中部洼陷的成藏基本条件进行分析对比认为,北部洼陷烃源岩厚度大、有机质丰度高、成熟度高,储集层多为高孔—特高孔、中—高渗砂岩,泥岩盖层单层厚度大、超压广泛发育,圈闭的闭合幅度和面积大,运移动力充足,以断层垂向输导为主,晚期断层不发育,保存条件好;中部洼陷烃源岩厚度相对较小,有机质丰度中等,成熟度较低,储集层以中孔低渗砂岩为主,泥岩盖层单层厚度相对较小、超压局部发育,圈闭的闭合幅度和闭合面积相对较小,运移动力相对较弱,输导体系复杂,晚期断层发育,对先存油气藏具一定破坏作用。研究结果表明,北部洼陷与中部洼陷均具备油气成藏的基本条件,但北部洼陷的成藏条件优于中部洼陷,是辽西凹陷油气勘探的有利区域。The hydrocarbon accumulation conditions of north sub-sag and central sub-sag in Liaoxi sag of Liaodong Bay depression was cor-related and analyzed. It is recognized that the north sub-sag is characterized by large thickness of source rocks, high organic matter abun-dance, high maturity; the reservoirs are mostly sandstone with high-super high porosity, middle-high permeability, the mud cap rock haslarge single layer thickness and the overpressure is widely developed, the trap closure amplitude and area are large, the migration force issufficient, the fluid is mainly transported vertically along the faults that are undeveloped in the late stage of tectonic movement, and the oilconservation condition is good. The central sub-sag is characterized by relatively small thickness of source rocks, medium organic matterabundance, low maturity; the reservoirs are dominated by sandstone with middle porosity and low permeability, the mud cap rock has smallsingle layer thickness, the overpressure is locally developed, the trap closure amplitude and area are relatively small, the migration force isrelatively weak, the transport system is complex, the fault in the late stage of tectonic movement is developed, which has a certain of damag-es to previous existing oil-gas reservoirs. The studied result indicates that the north and central sub-sags do have basic conditions for hydro-carbon accumulation, but the north sub-sag is better than the central sub-sag in reservoir-forming condition, hence it is a favorable area forpetroleum exploration in Liaoxi sag,

关 键 词：渤海湾盆地 辽西凹陷 油气成藏 油气运移 断裂 

分 类 号：TE112.41[石油与天然气工程—油气勘探]