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天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地陇东地区中生界古地层压力演化与油气运聚

姚泾利,段毅，徐丽，罗安湘，邓秀芹，赵彦德，吴应忠，赵阳   

  1. 1.中国石油长庆油田分公司勘探开发研究院，陕西 西安 710018;
    2.中国科学院地质与地球物理研究所油气资源研究重点实验室，甘肃 兰州 730000
  • 收稿日期:2013-07-16 修回日期:2014-03-20 出版日期:2014-05-10 发布日期:2014-05-10
  • 通讯作者: 姚泾利yjl_cq@petrochina.com.cn E-mail:yjl_cq@petrochina.com.cn
  • 作者简介:姚泾利(1964-)，男，陕西泾阳人，高级工程师，博士，主要从事石油地质学研究. E-mail:yjl_cq@petrochina.com.cn.
  • 基金资助:

    国家自然科学基金项目(编号:41272125)资助.

Pressure Evolution and Oil-gas Migration and Accumulation in MesozoicPalaeo-strata in Longdong Area of the Ordos Basin#br# 

YAO Jing-li,DUAN Yi,XU Li,LUO An-xiang,DENG Xiu-qin,ZHAO Yan-de,WU Ying-zhong,ZHAO Yang   

  1. 1.Exploration and Development Institute of Changqing Oilfield Company，CNPC，Xi′an 710018，China；2.Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,
    Chinese Academy of Sciences,Lanzhou 730000,China
  • Received:2013-07-16 Revised:2014-03-20 Online:2014-05-10 Published:2014-05-10

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546

摘要：

通过地层异常压力的形成与演化研究可以了解油气的成藏过程，但目前缺乏对鄂尔多斯盆地中生界地层压力演化的定量研究。依据研究区声波时差测井曲线资料以及岩石与流体的物理数据，利用等效深度法和构造抬升剥蚀后地层流体压力的定量计算公式，分别计算了该盆地陇东地区在早白垩世末期最大埋深时地层压力和现今地层压力，确定了这2个重要时期地层压力变化特征；采用流体包裹体PVT热动力学模拟方法，获得了研究区不同地史时期古地层压力值，利用这些古地层压力值恢复了地史时期地层压力的演化规律。资料显示早白垩世末期鄂尔多斯盆地陇东地区中生界普遍存在剩余压力，长7油层组剩余压力最高，可达到14.50MPa；构造抬升剥蚀后，除长7油层组在部分地区仍然保留了异常高压外，研究层位普遍形成了异常低压，一般分布在-9.42～-2.25MPa之间。地层异常压力发育和演化经历了高压原始积累、高压消失和低压形成3个阶段，这种地层异常压力演化与该盆地中生界埋藏演化史、生烃史相一致。异常高压是油气初次和二次运移的主要动力，陇东大部分地区都满足了长7段烃源岩向长8段储层排烃的动力条件；长8段地层剩余压力较低区为油气运移成藏的指向地区。

关键词: 鄂尔多斯盆地, 中生界, 地层压力演化, 油气运聚

Abstract:

The research on formation and evolution of abnormal formation pressure is of significant importance for understanding the known hydrocarbon accumulation process.However,there is no such quantitative research on Mesozoic formation pressure evolution in the Ordos Basin.Based on acoustic time data and physical data in the studied area,the formation pressure in the late period of Early Cretaceous with maximum burial depth in Longdong area of the Ordos Basin and formation pressure nowadays were respectively calculated by equivalent depth method and quantitative calculation formula of formation fluid pressure after stratum denudation as a result of tectonic uplift,and the formation pressure change characteristics in the two critical periods were determined.Evolution of historical formation pressure in the studied area was restored using ancient formation pressure value in different periods of geologic history obtained by pressure measurement of fluid inclusions.The results show that the residual pressure in Mesozoic strata in Longdong area is generally developed in the late period of Early Cretaceous.The residual pressure in Chang 7 subsection is the highest and can reach 14.50 MPa.After strata denudation due to tectonic uplift,subnormal pressure in Mesozoic strata is generally formed in the studied area except for Chang 7 subsection in some districts.The subnormal pressure generally ranges from -9.42 to -2.25 MPa.The development and evolution of abnormal formation pressure were divided into three stages: initial abnormally high pressure accumulation stage,abnormally high pressure expulsion stage and subnormal pressure formation stage,and this is consistent with Mesozoic burial evolution and hydrocarbon generation history in this basin.Abnormally high pressure is important dynamic force for primary and secondary migration of oil and gas.Most of the Longdong area meets dynamic condition of hydrocarbon expulsion of Chang 7 source rocks to Chang 8 reservoir.The area with lower residual pressure in Chang 8 Formation is the main directional area for oil-gas migration and accumulation.

Key words: Ordos Basin, Mesozoic, Formation pressure evolution, Oil-gas migration and accumulation

中图分类号: 

  • TE122.1

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