现代地质2013，Vol.27Issue(3)：681-687,7.
歧口凹陷古近纪构造演化及其对油气成藏的影响
Structural Evolution of Paleogene and Its Affect on Lithologic Reservoir in Qikou Sag
摘要
Abstract
The analyses of the mode of structural evolution in Qikou sag showed that,graben faulting of Paleogene generate complex half graben-like framework on NW-SE orientation and complex duplex fault graben on N-S orientation in Qikou sag.The tectonic framework of the convex,concave and concave-uplift alternately formed in Qikou sag,which created favorability for the formation of the lithologic reservoir.The high-quality source rocks developed in the sedimentary center were material foundation of the development of the lithologic oil reservoirs.Synsedimentary fault and its configuration decided the characters of gullies controlling sources,transform zones controlling fans and faulted slopes controlling sands,and that the middle of subaqueous fan,delta front and infralittoral subaqueous fan were the most favorable hydrocarbon accumulation zones.The development of the faults make the deep oil-gas accumulation more favorable,which provided effective reservoir space for the development of the lithologic oil reservoir.Tectonic activity and sedimentary evolution formed the optimal configuration relationships of the source-reservoir-cap,which created favorable conditions for the formation of multi-types lithologic oil reservoirs.According to the lithologic oil reservoir types,spatial distribution characteristics and oil accumulation characters in Tanan sag,four kinds of lithologic oil reservoir forming modes are summarized,including the fault terrace-steep slope-break belt,fault terrace-gentle slope-break belt,cliffsteep slope-break belt and inner basin slope,break belt reservoir forming mode of Qikou sag,combining the geological structure characters.In Qikou sag,4 types of oil-gas accumulation modes are formed:accumulation of shelving,accumulation of actic region,accumulation of fault flight of stairs,accumulation of break in slope of Qikou sag.关键词
歧口凹陷/构造演化/成藏模式Key words
Qikou sag/ structural evolution/ oil-gas accumulation mode分类
能源科技引用本文复制引用
王芝尧,侯素英,刘志英..歧口凹陷古近纪构造演化及其对油气成藏的影响[J].现代地质,2013,27(3):681-687,7.基金项目
中国石油天然气集团公司科技专项项目(2008E-0601). （2008E-0601）
