Adsorption Mechanism and Kinetic Characterization of Bituminous Coal under High Temperatures and Pressures in the Linxing-Shenfu Area

作     者：TAO Chuanqi WANG Yanbin LI Yong NI Xiaoming GAO Xiangdong TAO Chuanqi;WANG Yanbin;LI Yong;NI Xiaoming;GAO Xiangdong

作者机构：School of Mining EngineeringLiaoning Shihua UniversityFushun 113001LiaoningChina Liaoning Key Lab of Petro-chemical Special Building Materials College of Geoscience and Surveying EngineeringChina University of Mining and TechnologyBeijing 100083China School of Energy Science and EngineeringHenan Polytechnic UniversityJiaozuo 454000ShangdongChina School of Earth Science.East China University of TechnologyNanchangJiangxi 30013.China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2020年第94卷第2期

页      面：399-408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] 

基　　金：the National Great Science&Technology Specific Project(2016ZX05066001-002) National Science Foundation for Young Scientists of China(Grant No.41702171) Program for Excellent Talents in Beijing(2017000020124G107) Liao Ning Revitalization Talents Program grant number [XLYC1807129] 

主　　题：coalbed methane pressure and temperature energy nanoporosity Ordos Basin 

摘      要：The majority of coalbed methane(CBM) in coal reservoirs is in adsorption states in coal matrix pores. To reveal the adsorption behavior of bituminous coal under high-temperature and high-pressure conditions and to discuss the microscopic control mechanism affecting the adsorption characteristics, isothermal adsorption experiments under hightemperature and high-pressure conditions, low-temperature liquid nitrogen adsorption-desorption experiments and CO2 adsorption experiments were performed on coal samples. Results show that the adsorption capacity of coal is comprehensively controlled by the maximum vitrinite reflectance(Ro, max), as well as temperature and pressure conditions. As the vitrinite reflectance increases, the adsorption capacity of coal increases. At low pressures, the pressure has a significant effect on the positive effect of adsorption, but the effect of temperature is relatively weak. As the pressure increases, the effect of temperature on the negative effect of adsorption gradually becomes apparent, and the influence of pressure gradually decreases. Considering pore volumes of pores with diameters of 1.7-100 nm, the peak volume of pores with diameters 10-100 nm is higher than that from pores with diameters 1.7-10 nm, especially for pores with diameters of 40-60 nm, indicating that pores with diameters of 10-100 nm are the main contributors to the pore volume. The pore specific surface area shows multiple peaks, and the peak value appears for pore diameters of 2-3 nm, indicating that this pore diameter is the main contributor to the specific surface area. For pore diameters of 0.489-1.083 nm, the pore size distribution is bimodal, with peak values at 0.56-0.62 nm and 0.82-0.88 nm. The adsorption capability of the coal reservoir depends on the development degree of the supermicroporous specific surface area, because the supermicroporous pores are the main contributors to the specific pore area. Additionally, the adsorption space increases as the adso