【作者】 曾庆辉；

【导师】 肖贤明；

【作者基本信息】 中国科学院研究生院（广州地球化学研究所） ， 地球化学， 2006， 博士

【摘要】 惠民凹陷临南洼陷是一个典型第三纪断拗型洼陷。该洼陷典型特点是含油气层位多,分布广,构造复杂,油气藏成因复杂。长期以来对油气生成与成藏规律认识深度不够,对开拓新的勘探领域缺少科学依据。本研究开展临南洼陷生烃成藏研究,取得了如下主要成果与认识: (1).临南洼陷主力烃源岩生烃母质主要是菌解无定形体,干酪根中含有较高的有机硫,含量可达3.68%～7.28%:烃源岩体现出早期生油的特点,石油窗介于VRo 0.50%-0.90%。 (2).临南洼陷烃源岩生烃周期长,可从35Ma开始,一直延续到现在,明显存在两个生油期:第一个生油峰期出现在30-20Ma,第二个生油峰期出现在10Ma以后。 (3).临南洼陷含油气系统可划分成三个成藏体系:早期(20Ma以前)低成熟油气成藏体系;中期(10-20Ma)成藏体系;晚期(10Ma以后)成藏体系。早期与中期成藏体系主要形成隐蔽性油气藏,晚期成藏体系主要形成构造油气藏。目前发现的油气藏主要属晚期成藏体系。 (4) 临南洼陷油气勘探方向是在继续寻找构造油气藏的同时,要以寻找早期成藏体系形成的隐蔽地层、岩性油气藏为重点,勘探位置应由隆起转向斜坡带及盆地内部。 本研究成果不仅对于临南洼陷油气评价与勘探具有指导作用,而且对于我国第三纪陆相油气盆地成藏规律的研究具有借鉴与参考价值。更多还原

【Abstract】 The Linnan Depression is a typical fault-folded depression. It is characterized by multi-petroleum-bearing seams, widely distributed source rocks, complicated structures and variable types of petroleum pools. For these reasons, there has been no deep understanding on the petroleum generation and petroleum pool formation patterns for a long period, and lack of scientific ideas for further exploration in this depression. In this study, a combination method of petroleum geochemistry and petroleum geology has been applied to investigate the Linnan petroleum system. The following main results have been obtained:(1) The main oil source rocks are ES33-ES23 dark mudstone and their main source matter is a type of biodegraded amorphinite. The kerogens contain high contents of organic sulphur, in the range of 3.68%-7.28%. This type of source rock is characterized by an earlier oil generation model, with oil window in the range of VRo 0.50-0.90% .(2). The petroleum generation of the source rocks from the Linan Depression has covered a long period from 35 Ma up to present time. There are two petroleum generation peaks, occurring during 30-20Ma and after 10 Ma, respectively.(3). The Linnan petroleum system can be subdivided into three petroleum pool systems: the early system (formed before 20 Ma), the middle system (formed during the period of 10-20 Ma), and the late system(after 10 Ma). The hidden petroleum pools were mainly formed during the periods of the early and middle systems, and the structural petroleum pools mainly formed during the late system period.(4).The further exploration direction of the Linnan Depression should focus on hidden petroleum pools on the basis of exploration of structural petroleum pools.These results not only give a guide to the petroleum evaluation and exploration in the Linnan Depression, but also provide a case study on petroleum pool system for the petroleum-bearing basins of Tertiary age.更多还原