石油与天然气地质 ›› 2009, Vol. 30 ›› Issue (6): 684-688,691.doi: 10.11743/ogg20090602

• 成藏理论 • 上一篇    下一篇

构造抬升剥蚀与异常压力形成

包友书1,2   

  1. 1. 中国石油大学, 地质资源与信息学院, 山东, 东营, 257067;
    2. 中国石油化工股份有限公司, 胜利油田分公司, 地质科学研究院, 山东, 东营, 257015
  • 收稿日期:2009-05-19 出版日期:2009-12-25 发布日期:2012-01-16
  • 基金资助:

    国家重大专项"渤海湾盆地南部精细勘探关键技术"(2008ZX05000-006)

Relationship between tectonic uplifting & erosion and formation of abnormal pressure

Bao Youshu1,2   

  1. 1. College of Geo-Resources and Information, China University of Petroleum, Dongying, Shandong 257061, China;
    2. Geology Research Institute, SINOPEC Shengli Oilfied Company, Dongying, Shandong 257015, China
  • Received:2009-05-19 Online:2009-12-25 Published:2012-01-16

摘要:

根据物理化学原理,建立了完全封闭条件下构造抬升剥蚀后地层流体压力的定量计算公式。公式显示,在完全封闭条件下构造抬升后的地层压力取决于抬升前的地层压力、地层流体的压缩系数、地层流体的膨胀系数、岩石孔隙体积的压缩系数、抬升前后地层温度的变化和剥蚀厚度。根据流体的压缩系数和膨胀系数及岩石孔隙体积压缩系数的特点,经分析认为对于水层砂岩岩体,构造抬升剥蚀趋向于形成异常低压;对于气层,构造抬升剥蚀趋向于形成异常高压。

关键词: 回弹, 收缩, 压缩系数, 膨胀系数, 构造抬升, 异常压力

Abstract:

Based on the principles of physical chemistry,a formula is established for quantitatively calculating formation fluid pressure after tectonic uplifting and erosion in a closed system.The calculation results with the formula show that formation pressure after tectonic uplifting and erosion in a closed system depends on such factors as initial formation pressure before tectonic uplifting,compressibility coefficient and expansion coefficient of formation fluid,compressibility coefficient of pore volume,temperature variation before and after uplifting,and erosion thickness.An analysis of compressibility coefficient and expansion coefficient of formation fluid as well as compressibility coefficient of pore volume reveals that an abnormal low pressure is likely to be formed in water-bearing sandstone formations,while an abnormal high pressure is more possible in gas-bearing formations after the uplifting.

Key words: rebound, constringency, compressibility coefficient, expansion coefficient, tectonic uplifting, abnormal pressure

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