天然气地球科学 ›› 2008, Vol. 19 ›› Issue (3): 311–315.doi: 10.11764/j.issn.1672-1926.2008.03.311

• 天然气地质学 • 上一篇    下一篇

含油气盆地异常低压成因研究现状

高岗1;刚文哲1;范泓澈1;桑廷义2;聂朝强2   

  1. (1.中国石油大学,北京 102249;2.吐哈油田分公司,新疆 哈密 839000)
  • 收稿日期:2008-01-28 修回日期:2008-03-23 出版日期:2008-06-10 发布日期:2008-06-10

Research Advances for the Genesis ofAbnormally Low Formation Pressure in Petroliferous Basins

GAO Gang1;GANG Wen-zhe1;FAN Hong-che1;SANG Ting-yi2; NIE Chao-qiang2   

  1. (1.China University of Petroleum, Beijing 102249, China; 2.Tuha Oilfield Company, Hami 839000,China)
  • Received:2008-01-28 Revised:2008-03-23 Online:2008-06-10 Published:2008-06-10

摘要:

从不同地质因素入手,分析了含油气盆地异常低压的形成机理,认为各种机理在形成异常低压时的作用范围和程度明显不同:由地壳垂向抬升作用引起的地层抬升和上覆地层的剥蚀及其导致的地层温度降低是低压形成的重要区域因素,尤其是在垂向构造活动较为频繁的盆地;轻烃扩散对油气藏内压力的降低具有一定作用;流体密度差产生的低压与区域性地层倾斜有关,是深盆气藏压力降低的原因之一;低水位承压面主要在浅部流体压力系统起作用,对深部流体压力系统的作用微弱;渗吸、储层物性差异与地层水化学作用对实际异常低压的形成意义不大;地下流体采出出现于油气藏开采之后的阶段,不是原始地层异常低压的原因。指出在对不同含油气盆地的异常低压进行解释时,应具体问题具体分析。

关键词: 含油气盆地, 异常低压, 构造运动, 扩散作用, 油气藏

Abstract:

Based on various geological factors, the genesis mechanisms of abnormally low formation pressure (ALFP) were analyzed systematically. The operating range and levels which they act on are obviously different from each other. The main areal reasons for ALFP coming into being, especially in the basins with frequent vertical tectonic movement, are the strata uplifting, the overlying formation erosion and the stratum temperature drop, which were caused by vertical crust uplift movement; lighter hydrocarbon diffusion plays a role in reducing the ALFP of hydrocarbon pools; ALFP that caused by fluid density difference is always related to the regional inclination of seam, it’s a reason for the pressure reduction in deep basin gas pools; hydraulic head probably take effect in the superficial fluid pressure system, but do less work in the deep fluid pressure system. The ion pervasion, reservoir property differences and the chemical actions of formation water is subsidiary in the practical ALFP generation; underground fluid extracting doesn’t influence the original stratum pressure. In different petroliferous basins, it’s necessary to make concrete analysis for concrete conditions when the ALFP is being studied.

 

Key words: Petroliferous basin, Abnormally low formation pressure, Tectonic movement, Diffusional effect, Petroleum pool

中图分类号: 

  • TE122

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