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现代地质 ›› 2012, Vol. 26 ›› Issue (3): 540-546.

• 石油地质学 • 上一篇    下一篇

辽东湾断陷金县1-1低凸起东斜波沙三段泥岩古地层压力恢复及应用

 陈凯1, 刘震1, 朱文奇1, 周心怀2, 张荣辉3   

  1. 1 中国石油大学 油气资源与探测国家重点实验室,北京102249;2 中海石油(中国)有限公司 天津分公司, 天津300452;3 中国石油长庆油田公司 采油八厂,陕西 西安710021
  • 收稿日期:2011-12-09 修回日期:2012-02-08 出版日期:2012-06-07 发布日期:2012-06-14
  • 作者简介:陈凯,男,博士研究生,1984年出生,石油地质学专业,主要从事油气成藏机理方向研究。Email: Ivychan2046@163.com。
  • 基金资助:

    中国海洋石油总公司科技项目(SC06TJ-TQL-004)。

Restoration of Paleoformation Pressure of Shale in the 3rd Member ofShahejie Formation and Its Application in Eastern Slope of Jinxian1-1 Low Uplift, Liaodong Bay Fault Depression

 CHEN  Kai-1, LIU  Shen-1, SHU  Wen-Ai-1, ZHOU  Xin-Fu-2, ZHANG  Rong-Hui-3   

  1. 1 State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing102249, China;2 Tianjing Branch of CNOOC Limited, Tianjin300452, China;3 No.8 Oil Production Company of Changqing Oilfield Company,PetroChina,Xian, Shaanxi710021,China)
  • Received:2011-12-09 Revised:2012-02-08 Online:2012-06-07 Published:2012-06-14

摘要:

烃源岩生烃过程中欠压实作用形成的异常高压是油气成藏的主要动力,而泥岩孔隙度演化记录了其地层压力的变化过程。根据现今泥岩压实剖面特征建立欠压实泥岩孔隙度计算模型,利用“回归反推”方法恢复成藏期沙三段欠压实泥岩古孔隙度增量,然后根据泥岩孔隙度压实模型恢复欠压实泥岩在成藏期的总古孔隙度,最后通过改进的Phillippone公式计算成藏期古地层压力并恢复其演化过程。研究表明,金县1-1低凸起东斜坡成藏期沙三段烃源岩普遍发育异常高压,古流体动力由南向北逐渐增强,压力系数分布呈现东南部低西北部高的特点,古流体压力的强弱变化规律对油气运移及有利目标的优选具有重要的意义。

关键词: 金县1-1低凸起东斜坡, 沙三段, 烃源岩, 泥岩古孔隙度, 古地层压力

Abstract:

Overpressure in shale is the main force for hydrocarbon expulsion and primary migration, and its changes are always recorded by the evolution of shales porosity. Firstly, the evolution module of shales porosity in undercompacted shale was set up through compaction section reflecting the characteristic of compaction at present. And then the method of “regressive extrapolation” modeling was used to restore evolution porosity increment of paleoporosity shale in hydrocarbon accumulation period. Based on this restoration, the total porosity of undercompacted shale could be figured out by the evolution module of shales porosity. Finally, modified Phillippone formula could be used to calculate paleoformation pressure of source rocks and to recover evolution of paleoformation pressure. The result showed that overpressure of source rock of the 3rd Member of Shahejie Formation enhanced gradually from south to north in eastern slope of Jinxian 1-1 low uplift, and the change regular of paleoformation pressure was important for hydrocarbon migration and profitable target selection.

Key words: the eastern slop of Jinxian 1-1 low uplift, the 3rd Member of Shahejie Formation, source rock, mudstone paleo porosity, shale paleo formation pressure