石油与天然气地质 ›› 1999, Vol. 20 ›› Issue (4): 326-329.doi: 10.11743/ogg19990412

• 油气空间 • 上一篇    下一篇

济阳坳陷孤南洼陷油气成藏系统

伍涛, 陈建渝, 田世澄   

  1. 中国地质大学 北京 100083
  • 出版日期:1999-12-25 发布日期:2012-01-16

PETROLEUM ACCUMULATON SYSTEMS IN GUNAN SAG,JIYANG DEPRESSION

Wu Tao, Chen Jianyu, Tian Shicheng   

  1. China University Geosciences, Beijing
  • Online:1999-12-25 Published:2012-01-16

PDF (PC)

929

被引次数

56

摘要：

孤南洼陷是渤海湾盆地济阳坳陷内的一个洼陷,根据其烃源岩特征,油气成藏演化与分布特征,可以划分出两个油气成藏系统,即成藏系统Ⅰ和成藏系统Ⅱ。成藏系统Ⅰ以沙河街组三段为烃源岩,从东营组末期开始进入生烃门限,目前处在成熟阶段,储集岩从基底中生界直至馆陶组都有分布;成藏系统Ⅱ以沙河街组一段为烃源岩,自馆陶组末期进入生烃门限,目前处于低成熟阶段,储集岩主要分布在沙河街组二段、沙河街组一段及东营组。尽管两个系统的油源区基本重叠,但油气的性质和空间分布有很大差别。成藏系统Ⅰ的范围可以从洼陷内部延伸到周围的突起,成藏系统Ⅱ的原油主要聚集在洼陷内部。另外,两个成藏系统的油气运移、聚集方式也不同。成藏系统Ⅱ主要以侧向运移、侧向充注为主,形成单源油藏。成藏系统Ⅰ在i洼陷外围通过断裂带的垂向运移及垂向充注,可以形成混源油藏。这两个系统一方面是独立的,另一方面又被断层所关联,空间相互叠置,时间相互衔接。

关键词: 烃源岩, 储集岩, 油气运移, 成藏系统, 孤南洼陷

Abstract:

Gunan Say is located in Jiyang Depression, Bohai Bay Basin. Based on the characteristics of its source rocks,pool-forming evolution and distribution, the sag can be divided into two pool-forming systems, i. e. petroleum accumulation system I and the system Ⅱ. The main source rock of the system I is the third member of Shahejie Formation, hydrocarbon generation threshold was in the end of Oligocene, and now it is highly matured. The reservoir rocks of the system I are distributed from Mesozoic basement to Neogene clastic rocks. The source rock of the system Ⅱ is the first member of Shahejie Formation, its hydrocarbon generation threshold was in the end of Miocene, and now is lowly matured;the reservoir rocks are mainly distributed in the first and second members of Shahejie Formation and Dongying Formation. Although the source provinces of the two systems are generally superposed, the distribution and propenies of hydrocarbon are different. System I stretches bo the intrasag to surrounding uplifts,while system Ⅱ streches to the intrasag only. Besides their migration and accumulation ways are different.

Key words: source rock, reservoir rock, oil and gas migration, petroleum accumulation system, Gunan Sag

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