Effective migration system of coalbed methane reservoirs in the southern Qinshui Basin

作     者：WU CaiFang QIN Yong ZHOU LongGang Wu C F;Qin Y;Zhou L G

作者机构：School of Resource and Earth Sciences China University of Mining & Technology Key Laboratory of CBM Resource and Formation HistoryMinistry of Education 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2014年第57卷第12期

页      面：2978-2984页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0704[理学-天文学] 

基　　金：jointly supported by National Natural Science Foundation of China(Grant No.41272178) the Major Projects of National Science and Technology of China(Grant No.2011ZX05034) National Basic Research Program of China(Grant No.2009CB219605) "Qinglan"Project of Jiangsu Province 

主　　题：煤层气藏 沁水盆地 裂缝发育程度 断裂系统 移民 控制功能 弹性能 煤层甲烷 

摘      要：Effective migration system of coalbed methane(CBM)reservoir,which was controlled by development degree and opening-closing degree of fractures,determines the permeability of coal reservoir and can be characterized by the pore-fracture system in the extrinsic form.In this paper,based on coal matrix elastic self-regulating effect theory and coal reservoir combined elastic energy theory,the fracture opening-closing degree parameterΔand the fracture development degree parameterξare suggested for the quantitative study of the effective migration system of CBM reservoir in southern Qinshui Basin.Further,the control functions ofξandΔto CBM enrichment and high production are discussed.The results show that in present stage the area with highξvalue is located in Anze and Qinyuan,and then Zhengzhuang and Fangzhuang,where fracture development degree is high.The area with highΔvalue is located in Zhengzhuang and Fanzhuang,and then Anze and Qinyuan,indicating where coal matrix elastic self-regulating positive effect dominates and fractures tend to be open.Through the comprehensive analysis onξandΔ,it can be found that their best match area is located in Zhengzhuang and Fanzhuang,with high values for fracture development degree and opening-closing degree probably bringing about high fluid pressure and good permeability of reservoirs,which are advantageous to an abundant CBM production.