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

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

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Overmature continental shale is commonly developed,but few studies have given insight into its pore structure and sorption capacity.Various techniques,including SEM,helium porosity and permeability,N2/CO2 adsorption,MICP,and NMR,were used to detect the pore structure of shale from the Shahezi Formation,Xujiaweizi Fault,Songliao Basin.The excess methane adsorption volumes were measured by the volumetric method and modeled by the Langmuir model.Based on the findings,the most developed pores are intraparticle pores in clay minerals,followed by the dissolution pores in feldspar,but organic pores are uncommon.The selected shales have low helium porosity(mean 1.66%)and ultralow permeability(mean 0.0498 × 10-3μm2).The pore throats are at the nanoscale,and the pore-throat size distributions are unimodal,with most less than 50 nm.The studied shales are characterized by the lower specific surface area(SSA)and pore volume(PV)but the larger average pore diameter.The total SSA is contributed by the micro-and mesopores,while the PV is dominated by meso-and macropores.The pore structures are more complex and controlled by multiple factors,such as mineral compositions and diagenesis,but organic matter is not critical.The maximum absolute adsorption methane volume(VL)is 0.97-3.58 cm3/g(mean 1.90 cm3/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.

continental shalepore structuremethane adsorptionShahezi FormationSongliao Basin

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

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College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China

Sanya Offshore Oil & Gas Research Institute,Northeast Petroleum University,Sanya 572025,China

School of Geoscience,China University of Petroleum(East China),Qingdao 266580,China

College of Resources and Environment,Yangtze University,Wuhan 430100,China

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Natural Science Foundation of Shandong ProvinceNatural Science Foundation of Shandong ProvinceNatural Science Foundation of Shandong Province

ZR2020QD036ZR2020QD037ZR2021QD072

2024

地球科学前沿
高等教育出版社

地球科学前沿

CSTPCD
影响因子:0.585
ISSN:2095-0195
年,卷(期):2024.18(1)