Characterization of Pores and Methane Sorption Capacity of Permian Shales in Southeast Anhui,Lower Yangtze Region
Received date: 2015-04-28
Revised date: 2015-06-04
Online published: 2015-08-10
To investigate pore characteristics and methane sorption capacity of Permian shale reservoir in Southeast Anhui,Lower Yangtze region,eight core samples were selected for test including Ar-ion milling-field emission scanning electron microscope,N2 adsorption-desorption and methane sorption experiments and related geochemical analysis.The results show that the shales contain multi-types of pores including inter-granular pore,intra-granular pore,intra-crystalline pore,dissolved pore,organic pore and micro-cracks.The total porosity of our samples ranges from 2.15% to 6.10% and average permeability is 0.002 57×10-3μm2.The nanoscale pores mainly consist of meso-pores and small parts of micro-and macro-pores.The pore diameters mostly range from 2 to 50nm.The pore volume counted by BJH equation ranges from 3.30-11.23mm3/g and the total surface area calculated by BET equation ranges from 3.91-20.84m2/g.The micropore surface calculated by T-method ranges from 1.015-4.053m2/g.Meso-and micro-pores mainly contribute to the surface areas.These namopores and large surface area in the Permian organic-rich shales could provide good conditions for shale gas storage.The methane adsorption capacity is up to 2.3-3.2m3/t at 27MPa.This indicates that the Permian shales have relatively favorable storage condition for shale gas.
HUANG Bao-jia,HUANG Hao,JIN Qiu-yue,ZHOU Gang,ZHAO XING-bin . Characterization of Pores and Methane Sorption Capacity of Permian Shales in Southeast Anhui,Lower Yangtze Region[J]. Natural Gas Geoscience, 2015 , 26(8) : 1516 -1524 . DOI: 10.11764/j.issn.1672-1926.2015.08.1516
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