煤田地质与勘探2016，Vol.44Issue(5)：63-70,8.DOI:10.3969/j.issn.1001-1986.2016.05.012
沁水盆地南部煤储层显微裂隙发育的影响因素
Study on the influencing factors of the microfracture development in coal reservoir in southern Qinshui basin
摘要
Abstract
The developmental characteristics of microfractures in No.3 and No.15 coal seams in southern Qinshui basin were studied by means of scanning electron microscope, fluorescence microscope, X ray diffraction and so on. The relationship between microfracture and influencing factors including crustal stress, micropetrological unit, metamorphic grade and mineral were summarized. The main factors affecting the development of microfractures in coal reservoir were discussed. The results show that the microfractures in coal reservoir of this area are relatively developed and the density is generally 7~59 strips per 9 cm2. Microfractures of type D and type C dominate. Ten-sile fractures and shear fractures that make relatively larger contribution to the permeability are common in scan-ning electron microscope, whereas endogenetic fractures are rare. Microfractures are generally developed in vitrinite component. Microfracture density decreases with the increase of metamorphic grade. The mineral filling effect in coal has great influence on the development of microfracture and destroys the permeability of coal directly. The magnitude and direction of crustal stress field control the opening degree of exogenous microfracture and then affect coal permeability. Therefore, crustal stress and mineral in coal are the main factors that influence the devel-opment of microfractures in coal reservoir of this area.关键词
沁水盆地南部/煤储层/显微裂隙/影响因素Key words
southern Qinshui basin/coal reservoir/microfracture/influenting factors分类
天文与地球科学引用本文复制引用
胡咤咤,黄文辉,刘素平,张谦,许启鲁,冯小龙..沁水盆地南部煤储层显微裂隙发育的影响因素[J].煤田地质与勘探,2016,44(5):63-70,8.基金项目
国家重点基础研究发展计划(973计划)课题(2014CB238901)；国家科技重大专项课题(2011ZX05042-001)；中央高校基本科研业务费专项资金(2652011266)@@@@TheNational Key Basic Research and Development Program of China (973 Program)(2014CB238901)；The National Science and Technology Major Project(2011ZX05042-001)；The Fundamental Research Funds for the Central Universities of China(2652011266) （973计划）
