编号：CDUT-2022-17

标题：Characterizations of pore, mineral and petrographic properties of marine shale using multiple techniques and their implications on gas storage capability for Sichuan Longmaxi gas shale field in China

入藏号：WOS:000458760500035

中国科学院文献情报中心期刊分区： 工程技术1区/TOP（2019年升级版）

本校作者：徐浩，周文，周秋媚

来源出版物：FUEL卷241 页360-371

出版年：  2019

第一地址： 成都理工大学

关键词：海相页岩；孔隙结构；矿物含量；含气性；龙马溪组页岩；温度效应

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摘要：Pore, mineral and petrographic properties of shale conjunctionally determine the gas storage and transportproperties of gas shale reservoirs. To investigate how these characteristics and pore structure influence themethane adsorption capability of shale formation, a total of forty-nine over-matured shale outcrop samples,thirty samples from Upper Longmaxi Formation and nineteen samples from Lower Longmaxi Formation fromsouthern Sichuan Basin in China, were collected. Multiple techniques, including geochemical and mineralogicalmeasurements, field emission-scanning electron microscopy (FE-SEM), mercury intrusion porosimetry (MIP),low-pressure CO2 and N2 adsorption and high-pressure methane adsorption, were employed to characterize thegeo-properties, pore structure and their impacts on methane adsorption capacity under different temperatures.Geochemical and mineralogical results show that both Upper and Lower Longmaxi shales are over-maturedwhich have oil-prone type I kerogen. Based on the FE-SEM observation, most of the organic matter (OM) pores inthe tested Longmaxi shales are spongy OM pores due to the over-maturity stage with Ro between 2.36% and3.15%. In general, Lower Longmaxi shales are rich in micropores with larger pore volume and specific surfacearea (SSA) compared to those of the Upper ones. A combination of CO2/N2 adsorption and MIP analyses on thepore structure show a whole-aperture pore size distribution (PSD) ranging from 0.4 nm to 10 μm. The methaneadsorption capacity increases with increasing TOC for Lower and Upper Longmaxi shales, respectively, whileincreases with increasing SSA for combined Lower and Upper ones. It is noted that, the numerous OM pores inLower Longmaxi shale are the primary contribution to a better pore network and greater methane adsorptioncapacities compared to that of the Upper Longmaxi shale, but it all depends on the surface area. Shale sampleswith higher surface area have higher methane adsorption capacity no matter which Longmaxi shale Formations.In addition, temperature has an apparently negative effect on methane adsorption capacity for both Upper and Lower Longmaxi shales, where temperature is more sensitive to the shale sample with higher TOC content.

文章链接地址： https://www.sciencedirect.com/science/article/abs/pii/S0016236118320878