Methane adsorption effected by pore structure of overmature continental shale:Lower Cretaceous Shahezi Formation,Xujiaweizi Fault,Songliao Basin

作     者：Pengfei ZHANG Shuangfang LU Nengwu ZHOU Zizhi LIN Xiangchun CHANG Junjian ZHANG Guo CHEN Yumao PANG Junjie WANG Hongsheng HUANG Qi ZHI Pengfei ZHANG;Shuangfang LU;Nengwu ZHOU;Zizhi LIN;Xiangchun CHANG;Junjian ZHANG;Guo CHEN;Yumao PANG;Junjie WANG;Hongsheng HUANG;Qi ZHI

作者机构：College of Earth Science and EngineeringShandong University of Science and TechnologyQingdao 266590China Sanya Offshore Oil&Gas Research InstituteNortheast Petroleum UniversitySanya 572025China School of GeoscienceChina University of Petroleum(East China)Qingdao 266580China College of Resources and EnvironmentYangtze UniversityWuhan 430100China 

出 版 物：《Frontiers of Earth Science》 (地球科学前沿（英文版）)

年 卷 期：2024年第18卷第1期

页      面：172-187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：supported by the Natural Science Foundation of Shandong Province(Nos.ZR2020QD036 ZR2020QD037 and ZR2021QD072) 

主　　题：continental shale pore structure methane adsorption Shahezi Formation Songliao Basin 

摘      要：Overmature continental shale is commonly developed,but few studies have given insight into its pore structure and sorption *** techniques,including SEM,helium porosity and permeability,N_(2)/CO_(2)adsorption,MICP,and NMR,were used to detect the pore structure of shale from the Shahezi Formation,Xujiaweizi Fault,Songliao *** excess methane adsorption volumes were measured by the volumetric method and modeled by the Langmuir *** on the findings,the most developed pores are intraparticle pores in clay minerals,followed by the dissolution pores in feldspar,but organic pores are *** selected shales have low helium porosity(mean 1.66%)and ultralow permeability(mean 0.0498×10^(−3)μm^(2)).The pore throats are at the nanoscale,and the pore-throat size distributions are unimodal,with most less than 50 *** studied shales are characterized by the lower specific surface area(SSA)and pore volume(PV)but the larger average pore *** total SSA is contributed by the micro-and mesopores,while the PV is dominated by meso-and *** pore structures are more complex and controlled by multiple factors,such as mineral compositions and diagenesis,but organic matter is not *** maximum absolute adsorption methane volume(VL)is 0.97−3.58 cm^(3)/g(mean 1.90 cm^(3)/g),correlating well with the total SSA,SSA,and pore volume of micropores,which indicates that methane is mainly adsorbed and stored in micropores,followed by mesopores.