湘鄂西地区下志留统龙马溪组页岩吸附能力主控因素

doi:10.11743/ogg20160104

Abstract

Abstract: Various laboratorial techniques are applied for dissecting the characteristics of the Longmaxi Formation shale in Western Hunan-Hubei Area,including organic carbon,mineral,porosity and methane adsorption.It is found that the Longmaxi Formation shale has good methane adsorption capacity with an average saturated adsorption gas content of 2.46 cm³/g under constant temperature 30℃,thus has favorable gas capacity storage.Correlation analysis reveals that the content of organic carbon,appropriate maturity,contents of vitrinite and inertinite,content of pyrite as well as the volume of micropores and mesopores,as the major internal controlling factors,are positively correlated with gas adsorption capacity,while temperature and pressure,as the external controlling factors,have negative and positive relationships with adsorption capacity,respectively.The tectonic uplifting produced a considerable influence on temperature and pressure due to its relatively high intensity.It is suggested that the influence of tectonic uplifting on adsorption capacity can be divided into two stages.When the strata are uplifted within high pressure zone,the impact of temperature on gas adsorption is greater than that of pressure,enhancing adsorption capacity.In contrast,when the strata enter into low pressure zone due to strong tectonic uplifting,the influence of pressure on gas adsorption is greater than that of temperature,rapidly lowering adsorption capacity.

Key words: adsorption characteristics, tectonic uplift, shale gas, Longmaxi Formation, western Hunan-Hubei area

CLC Number:

TE132.2

Chen Kang, Zhang Jinchuan, Tang Xuan, Yu Jingdu, Liu Yang, Yang Chao. Main controlling factors on shale adsorption capacity of the Lower Silurian Longmaxi Formation in western Hunan-Hubei area[J]. Oil & Gas Geology, 2016, 37(1): 23-29.

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Main controlling factors on shale adsorption capacity of the Lower Silurian Longmaxi Formation in western Hunan-Hubei area

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