Relationship between Methane Adsorption Capacity of Clay Minerals and Micropore Volume
Received date: 2013-07-09
Revised date: 2013-11-04
Online published: 2014-02-10
The pore size,surface area and methane adsorption isotherm of clay-rich rocks are measured.Clay minerals mainly contain micropore of 3-100nm,and have two main intervals of 3-6nm and 20-70nm.Smectite is of micropore-dominant.Illite-smectite mixed layer developed micropore and macropore in the same time,and kaolinite,chlorite and illite are of mesopore and macropore.Smectite,illite-smectite mixed layer and kaolinite are the polyporous type,their total pore volume and surface area are more than 0.04 mL/g and 11.47m2/g,respectively.Adsorption capacity of clay rocks is quite different.The maximum methane adsorption capacity of smectite,illite-smectite mixed-layer,kaolinite,chlorite,illite,sandstone and quartzite in the granularity of less than 270 mesh sequentially are 8.12 mL/g,3.66 mL/g,2.70 mL/g,2.28 mL/g,1.72 mL/g,0.97 mL/g and 0.70 mL/g.Surface area of clay minerals depends not only on the total pore volume and porosity,also on the pore size distribution closely.There is a good linear relationship between the micropore volume of clay minerals and the maximum amount of methane adsorption.Therefore,the micropore volume of shale reflects its adsorption capacity for natural gas.The adsorption capacity is controlled by the development degree of internal micropores,in particular less than 20nm micropores.The difference of clay minerals in morphological structure,pore size and porosity results in the differences of their adsorption capacity.This difference is associated not only with the clay type,also with its causes and the diagenesis experienced.
Key words： Clay minerals; Micropore volume; Methane adsorption; Isotherm
JI Li-ming，MA Xiang-xian，XIA Yan-qing，QIU Jun-li . Relationship between Methane Adsorption Capacity of Clay Minerals and Micropore Volume[J]. Natural Gas Geoscience, 2014 , 25(2) : 141 -152 . DOI: 10.11764/j.issn.1672-1926.2014.02.141
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