Pore Characteristics and Relation with Shale Gas in the Longmaxi Formation Shale Reservoir
Received date: 2015-04-19
Revised date: 2015-05-22
Online published: 2015-08-10
By using high pressure mercury,low temperature nitrogen adsorption,argon ion polishing-scanning electron microscope observation,the reservoir of Longmaxi Formation shale samples has been [HJ2.1mm]characterized.Combined with the molecular potential energy theory,the relationship between the Longmaxi Formation porosity and shale gas occurrence has been revealed.The research shows that:(1)Pores smaller than 100nm are most developed in the Longmaxi Formation shale reservoir,and the specific surface area is mainly provided by pore radius smaller than 8nm,and nano-pores are mainly organic matter pores.Those pores are not smooth,and have fractal characteristics.The surface of bigger pores has superimposed many small pores.(2)When the distance between CH4 and pore wall is shorter than 2nm,there are strong interactions between the two and when the distance is longer than 2nm,the interactions can be ignored,and the CH4 is in a free state.In pores larger than 2nm,adsorption capacity is proportional to the specific surface area,but in pores smaller than 2nm,average concentration has a great relationship with the aperture.(3)In the reservoir of Longmaxi shale,the volume of adsorbed gas decreases with increasing pore size,and when the radius is larger than 30nm,the volume of adsorbed gas can be ignored.Volume of free gas first increased and then decreased with increasing pore size.It reached a peak in the vicinity of 45nm.In the vicinity of the 10nm,free gas volume became more than adsorbed gas volume;In pores with radius smaller than 75nm,adsorption region accounts for 66%-71% of the total.
Key words: Longmaxi Formation; Pore; Occurrence of shale gas; Pore model
LIU Yu,XIA Xiao-hong,LI Wu,LI Jia-hong . Pore Characteristics and Relation with Shale Gas in the Longmaxi Formation Shale Reservoir[J]. Natural Gas Geoscience, 2015 , 26(8) : 1596 -1603 . DOI: 10.11764/j.issn.1672-1926.2015.08.1596
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