摘要
煤层作为煤层气的源岩和储集层,与常规天然气储层的不同在于煤储层是一种双孔隙岩层,由基质孔隙和裂隙组成,且有自身独特的割理系统。基质孔隙和割理的大小、形态、孔隙度和连通性等决定了煤层气的储集、运移和产出,其中又以割理系统对煤层气的产出影响为最大。以沁水煤田为例,对煤层割理、割理填充物类型、充填方式、自生矿物形成时代进行了研究,总结了填充物形成的先后顺序,并根据填充物的形成时代、煤层埋藏史等归纳出了割理形成的3种机制:埋藏增压机制、岩浆诱发机制和抬升卸压机制。
As source rocks and reservoirs of CBM,coal seams are different from conventional gas reservoirs.They have dual-porosity consisted of matrix pores and fractures and unique cleat systems.The accumulation,migration and production of CBM are determined by matrix pores and cleat systems(including size,geometry,porosity and connectivity),of which cleat systems have the largest effects on CBM production.Taking the Qinshui coal field as an example,this paper studies the coal cleat systems,the types of filling materials and filling patterns of the cleats and the age of authigenic minerals,and summarizes the order of formation of the filling materials.Based on the age of the filling materials and burial history of coal seams,3 kinds of cleat formation mechanisms are presented as follows:burial pressurization,magma induction,and uplifting depressurization.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2008年第3期36-39,共4页
Natural Gas Industry
基金
中国石油天然气集团公司2006年石油科技中青年创新基金项目的资助
关键词
沁水盆地
煤层气
煤层
储集层
割理
形成
机理
填充物
Qinshui Basin,coal-derived gas,coal seam,reservoir,cleat,formation,mechanism,filling material
