砂岩透镜体成藏机理  

Accumulation and Filling Mechanism of Lenticular Sandbody Reservoirs

作　　者：陈冬霞[1] 庞雄奇[1] 邱楠生[1] 姜振学[1] 张俊[2] 

机构地区：[1]石油大学石油与天然气成藏机理教育部重点实验室,北京102249 [2]石油大学盆地与油藏研究中心,北京102249

出　　处：《地球科学（中国地质大学学报）》2004年第4期483-488,共6页Earth Science-Journal of China University of Geosciences

基　　金：国家自然科学基金项目"砂岩透镜体成藏门限及其控油气作用"(No .40 172 0 5 7) .

摘　　要：砂岩透镜体油藏是隐蔽油气藏中增储上产的重要类型 ,但目前对其成藏机理的认识还存在很大分歧 .从油气初次运移机理入手 ,结合砂泥岩压实成岩过程的分析 ,对砂岩透镜体的成藏动力和成藏阻力及成藏过程进行了分析 .研究认为 :烃类生成引起的膨胀力、烃浓度差引起的扩散力和砂泥岩间的毛管压力差是成藏主动力 ,岩石吸附和粘滞力是成藏主要阻力 ;油气水以混相涌流方式为主 ,孔隙、微裂隙和微层理面是油气运移的通道 ;早成岩阶段不成藏 ,晚成岩早期成藏 。Lenticular sandbody reservoir is an important subtle reservoir type for increase of reserve, but its accumulation and filling mechanism are not well understood. Driven force and resistance during lenticular sandbody reservoir filling have been analyzed based on integrated research on the process of compaction and diagenesis in interbedded sand/mud strata. The results indicate that the driven forces resulting in the filling of reservoir include pressure due to the generation of hydrocarbon, diffusion by hydrocarbon concentration difference, capillary pressure between sand and mud. Rock absorption and adhibition are taken as resistance of reservoir filling. Hydrocarbon and water spill into the reservoirs in the mixing pattern through pore, fracture and joint fissure. Hydrocarbon is filled in early phase of late-diagenetic stage and preserved in late phase of late-diagenetic stage.

关 键 词：透镜体 成藏机理 济阳坳陷 初次运移 成藏动力 成藏模式 

分 类 号：P618.1[天文地球—矿床学]