摘要
以我国山西沁水盆地为例,采用现代构造应力场和构造曲率分析相结合的方法,就构造对煤储层高渗透性区发育特征的控制规律及其地质机理进行了研究。结果表明:沁水盆地下二叠统山西组主煤储层试井渗透率与现代构造应力场最大主应力差之间具有指数正相关关系,煤储层构造裂隙在构造主曲率大于0.1×10^(-4)/m的地段可能相对发育;高构造曲率与高最大主应力差相匹配的地段在盆地中-南部呈NNW向展布,是较高渗透性煤储层发育的地带;构造应力实质上是通过对天然裂隙开合程度的控制而对煤储层渗透率施加影响。
With the Shan' xi Qinshui Basin as a case, the geological mechanisms of structures controlling the occurrence of coalbed gas reservoirs with high-permeability were studied through a comprehensive analysis of modern tectonic stress field and curvature. The results showed that the testing well permeability of the major lower Permian Shan' xi Formation coal reservoirs is positively and exponentially correlated to the main maximum stress difference of modern tectonic stress field and the structural fissures in the coal reservoirs occur mostly in the zones with the structural curvature more than 0.1 × 10-4/m. The zones matched high curvature to high main stress difference in the central and southern basin extend in the NNW strike, where the coal reservoir permeability is relatively high. The tectonic stress affects coal reservoir substantially through controlling the open-close degree of the fissures in coal reservoir.
出处
《高校地质学报》
CAS
CSCD
2003年第3期359-364,共6页
Geological Journal of China Universities
基金
国家973计划项目(编号:2002CB211705
2002CB211704)
国家自然科学基金(编号:50134040)
关键词
煤储层
渗透性
分布
构造应力场
构造曲率
coal reservoir
permeability
occurrence
structural stress field
structural curvature
