基于煤体结构的煤层气井煤粉产出规律研究

Study on the Output Law of Coal Fine Produced by Different Coalbody Structure Coal from CBM Wells

以韩城矿区为研究对象,采用煤矿井下精细观察和描述,以及产出煤粉镜下形态观察的方法,阐述了不同煤体结构类型煤与煤粉产出的关系。研究表明,韩城矿区各煤层构造煤普遍发育,厚度百分比约46%,3号煤层发育鳞片煤为主,5号煤层以碎粒煤为主,碎裂煤次之,11号煤层以碎裂煤和碎粒煤为主;煤体结构类型决定了煤粉产出的破坏形式、产出特征及产出的倾向性,构造煤是煤粉产生和产出的主要控制因素。因此,查明不同煤体结构类型煤的平面展布规律和纵向分布特征,对煤层气的区带优选和储层改造层段选取具有重要的指导意义。

Based on the observation of coalbed in Hancheng Mining Area and output coalfine,Hancheng Block is taken as the study area to explore the relationship between different types of coalbody structure and coal fines produced by CBM well.Some conclusions are proposed as follows.Deformed coal is commonly developed and account for 46%of the total coalbed thicknessby the careful observation and description of coal seam No.3,No.5 and No.11 in Xiangshan coal mine.Scaled coal is mainly developed in No.3 coal seam,granulated coal in No.5 coal seam and fragmented&granulated coal in No.11 coal seam.The type of coalbodystructure determines the destructionalforms,output characteristics and proneness of coal fines,and the development of deformed coal are the control factors on the generation and output of coal fines by scanning electron microscope.Therefore,the identification of lateral and vertical distribution laws on different types of coalbody structure can provide guidance for zone optimization and selection of stimulated interval.