构造抬升剥蚀与异常压力形成

包友书

doi:10.11743/ogg20090602

成藏理论 | 浏览量 : 0 下载量: 982 CSCD: 0

PDF
导出
分享
收藏
专辑

构造抬升剥蚀与异常压力形成
Relationship between tectonic uplifting & erosion and formation of abnormal pressure
2009年30卷第6期页码：684-688
网络首发：2009-12-25，

纸质出版：2009
DOI： 10.11743/ogg20090602
稿件说明：

移动端阅览

包友书. 构造抬升剥蚀与异常压力形成[J]. 石油与天然气地质, 2009,30(6):684-688. DOI： 10.11743/ogg20090602.

Bao Youshu. Relationship between tectonic uplifting & erosion and formation of abnormal pressure[J]. 2009, 30(6): 684-688. DOI： 10.11743/ogg20090602.

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。

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.