摘要
碳中和背景下,促进煤层气开发与利用有重要能源安全战略意义,我国高煤级煤层气资源储量丰富,但存在显著的“产能瓶颈”问题,需要开展针对性的储层研究。利用CT技术,以沁水盆地阳泉矿区新景矿区无烟煤样品为例,对高煤级煤孔隙结构和连通性进行精细表征与三维重构分析。研究发现:无烟煤样品孔体积大多不超过8000μm^(3),孔表面积大多不超过2000μm^(2),孔径大多不超过10μm。无烟煤样品的渗流孔隙相对较为发育,但空间分布相对分散;对其空间连通性进行表征分析,并与低中煤阶煤的孔隙结构连通性进行对比,认为高煤级煤孔隙间相对孤立、不连通,难以构成连通域,造成储层虽具有良好吸附能力但渗流能力较差,从而影响基质中煤层气的渗流、运移和开发。
Under the background of carbon neutralization,it is of great strategic significance for energy security to promote the development and utilization of coalbed methane.China has abundant reserves of CBM in high-rank coal resources,but also has a significant problem of“Capacity Bottleneck”,which needs to be further studied.Using anthracite sample from the Xinjing mining area in Yangquan mining area,Qinshui Basin as an example,CT scanning technology was used to make characterization and establish three-dimensional reconstruction to reveal the pore structure and connectivity of high-rank coal.The study found that the pore volume of anthracite samples is mainly below 8000μm^(3),the pore surface area is mainly below 2000μm^(2),and the pore diameter is mainly below 10μm,the seepage pores of anthracite sample are relatively well developed with the spatial distribution relatively scattered;through the characterization and analysis of its spatial connectivity and the comparison with the pore structure of low-medium rank coals,it is considered that the pores of high-grade coal are relatively isolated and unconnected,which makes it difficult to form a connected region,resulting in good adsorption capacity and poor seepage capacity of the reservoir,thus affecting the seepage,migration and development of coal bed gas in the matrix.
作者
关欣
刘育伟
任重阳
汤迅
赵迪斐
GUAN Xin;LIU Yuwei;REN Chongyang;TANG Xun(School of Safety Engineering,China University of Mining&Technology,Jiangsu Xuzhou 221116,China;School of Mines,China University of Mining&Technology,Jiangsu Xuzhou 221116,China;School of Resources and Geosciences,China University of Mining&Technology,Jiangsu Xuzhou 221116,China;Sun Yueqi Honors College,China University of Mining&Technology,Jiangsu Xuzhou 221116,China)
出处
《非常规油气》
2023年第1期69-76,共8页
Unconventional Oil & Gas
基金
中国矿业大学大学生创新训练计划项目“甲烷氮气选择吸附材料的设计及其静态吸附性能研究”(201810059)。
关键词
无烟煤
显微CT
孔隙特征
连通性
三维重构
anthracite
micro-CT
pore characteristics
connectivity
3D reconstruction
