不整合结构对地层油气藏形成的控制作用研究  

Controls of Unconformity on the Formation of Stratigraphic Reservoirs

作　　者：吴孔友[1] 邹才能 査明 高长海[1] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266555 [2]中国石油集团科学技术研究院,北京100083

出　　处：《大地构造与成矿学》2012年第4期518-524,共7页Geotectonica et Metallogenia

基　　金：国家自然科学基金项目(批准号:40772081);国家科技重大专项(编号:2011ZX05001);山东省自然科学基金项目(编号:Y2008E16)联合资助

摘　　要：不整合不仅仅是一个"面",更是一个"体",其本身具有较独特的微观组构,即具有"空间结构"属性。通过大量的岩心观察、野外踏勘及测井资料对比解释,纵向上提出不整合结构体的概念,并将其划分为三层结构:结构体上层、结构体中层及结构体下层,其中结构体上层与下层构成储集体,结构体中层形成封盖层,且封盖强度随埋深加大而增加。地层油气藏是以不整合为界,并以其为主要圈闭条件,故以不整合为限,将地层油气藏分为不整合之上的地层超覆油气藏和不整合之下的地层剥蚀油气藏两大类,进而划分为十一亚类。通过对准噶尔盆地及渤海湾盆地典型地层油气藏的解剖,提出不整合之上的超覆尖灭线、不整合之下的剥蚀尖灭线及不整合结构体控制了地层油气藏的形成与分布。The unconformity is not only a recorder of tectonic movement and eustatic fluctuation,but also an indicator of the damage of the pre-sedimentary rocks.The heterogeneous weathering during sea(lake)-level fall and transgressive deposit during sea(lake)-level rise can form vertical structure of unconformity.So the unconformity is not a surface,but a body.The structural body of unconformity was put forward through plenty of core observation,outcrop survey,and logging.The structural body in section can be divided into the upper layer with good primary porosity,the middle layer with compactness and ductility which can be capping rock with sealing strength increases with depth,and the lower layer with good secondary porosity due to weathering and leaching.The unconformities consist of the boundaries and sealing factors of stratigraphic reservoirs.So stratigraphic reservoir can be divided into stratigraphic onlap reservoir which is located above the unconformity surface and stratigraphic truncation reservoir under the unconformity surface,and then divided into eleven sub-types according to the types of unconformity.The key factors controlled the formation and distribution of stratigraphic the reservoirs are onlap line,truncation line,and structural body of unconformity,as suggested by the analysis of the typical stratigraphic reservoirs in the Junggar basin and Bohai Gulf basin

关 键 词：不整合结构体 超覆地层油气藏 剥蚀地层油气藏 成藏主控因素 

分 类 号：TE12[石油与天然气工程—油气勘探]