Adsorption Characteristics and Main Controlling Factors on the Paleozoic Shale in South China Region
Received date: 2015-03-25
Revised date: 2015-05-22
Online published: 2015-09-10
The huge shale gas potential in the Paleozoic strata in South China region has attracted a widespread attention in recent years.This paper focused on the study of adsorption characteristics and controlling factors on the Paleozoic shale.A total 19 shale samples were obtained,their mineral compositions were analyzed,and their isothermal adsorption experiments were carried out.A thermal simulation experiment was conducted for a selected sample to obtain a suite of sub-samples with different maturities,their isothermal adsorption capacities were measured and the adsorption characteristics of shale with very high maturities were discussed.The result shows that the maximum adsorption capacity is between 0.21cm3/g and 5.63cm3/g for the Upper Permian shales and 1.66-3.32cm3/g for the Lower Cambrian-Lower Silurian shales.TOC content of shale is the main factor to control the adsorption capacity.The higher the content of TOC,the greater the adsorption capacity of the shale.The adsorption ability of clay minerals is weak for the studied shale and their contribution to the adsorption capacity is generally covered by the associated organic matter.Maturity is another key factor to influence the adsorption capacity of the shale.For samples with an EqRO or RO<3.6%,the adsorption capacity increased with increasing maturity,but when EqROor RO>3.6%,the adsorption capacity of the shale decreased with further increasing maturity.The present result is greatly significant to the evaluation of shale gas in the Paleozoic strata in South China region.
Key words： Paleozoic shale; Adsorption capacity; TOC content; Maturity; Mineral composition
LIU Zu-fa，LI Qiang-qiang，GUAN Shuai，ZHUO Wen-shan，DING Bo . Adsorption Characteristics and Main Controlling Factors on the Paleozoic Shale in South China Region[J]. Natural Gas Geoscience, 2015 , 26(9) : 1689 -1695 . DOI: 10.11764/j.issn.1672-1926.2015.09.1689
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