构造应力场对煤储层渗透性的控制机制研究

基金项目:

国家“十五”重点科技攻关项目“我国煤层气富集成藏规律与勘探开发有利地区优选研究”专题(2001BA605A-07-01)

详细信息

Research on mechanism of tectonic stress field controlling coal permeability

摘要: 以山西沁水盆地为例,首先进行了成煤后古构造应力场恢复和有限元模拟,分析了现代地壳主应力的分布特点;其次,结合煤、岩层中裂隙分布的差异性,分析了盆地东部、东南部煤储层裂隙的展布规律和主要受控特点,总结出晋城、潞城和阳泉3个“裂隙—应力”控制模式,并将全盆地煤层渗透性划分为好、中、差3个等级,并进行预测评价。
- 构造应力场 /
- 煤储层 /
- 渗透性 /
- 控制
Abstract: Taken Qinshui basin as an example,the relationship among stress, fracture and permeability is analyzed. Firstly, The resume of paleo-tectonic stress field and its simulation with finite element method are conducted. Secondly, combined with the difference of fracture in coal seams and surrounding rocks the analysis on the feature of current crust principle stress, the distribution rules of regional fractures in coal reservoir and their controlled factors in east and southeast Qinshui basin are studied in detail. Furthermore, three controlling models of fracture & stress in Jingcheng, Lucheng and Yangquan, three coal mining districts in eastern Qinshui, have been summarized. The permeability of coal seams in entire basin is classified into three levels of the perfect, medium and poor based on above study basis.
- structure stress field /
- coal reservoir /
- permeability /
- control