Methane sorption and storage characteristics of organic-rich carbonaceous rocks, Lurestan province, southwest Iran

Shabani, Mohammadebrahim; Moallemi, Seyed Ali; Krooß, Bernhard M.; Amann-Hildenbrand, Alexandra; Zamani-Pozveh, Ziba; Hormoz, Ghalavand; Littke, Ralf

doi:10.1016/j.coal.2017.12.005

Cited by 61 publications

(41 citation statements)

References 22 publications

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“…Overall, the Langmuir volume increases with increasing TOC content. This similar phenomenon has also been reported in other studies [18,21,[26][27][28]30], which suggests that there is a very strong correlation between Langmuir methane adsorption capacity and TOC content. Therefore, an increase in TOC content helps to improve the methane adsorption capacity.…”

Section: Compositional Effects On Methane Adsorption Capacity In Shalsupporting

confidence: 90%

“…It has been proven that a higher organic matter content brings a larger surface area and a larger methane adsorption capacity [21][22][23][24][25]. With increasing total organic carbon (TOC) content, the methane adsorption capacity increases linearly [18,21,[26][27][28][29][30]. Comparably, related studies have found that quartz and carbonate have a negative effect on the methane adsorption capacity in shale [25,27,31].…”

Section: Introductionmentioning

confidence: 99%

“…Some studies have found that with increasing the clay mineral content, the methane adsorption capacity substantially increases, especially in the low TOC shales [25,29,32]. However, other studies proposed that clay minerals have a weak [12,23,28,30] or even negative effect on methane adsorption capacity [21,33,34].…”

Section: Introductionmentioning

confidence: 99%

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Nanostructure Effect on Methane Adsorption Capacity of Shale with Type III Kerogen

et al. 2020

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This study focuses on the nanostructure of shale samples with type III kerogen and its effect on methane adsorption capacity. The composition, pore size distribution, and methane adsorption capacities of 12 shale samples were analyzed by using the high-pressure mercury injection experiment, low-temperature N2/CO2 adsorption experiments, and the isothermal methane adsorption experiment. The results show that the total organic carbon (TOC) content of the 12 shale samples ranges from 0.70% to ~35.84%. In shales with type III kerogen, clay minerals and organic matter tend to be deposited simultaneously. When the TOC content is higher than 10%, the clay minerals in these shale samples contribute more than 70% of the total inorganic matter. The CO2 adsorption experimental results show that micropores in shales with type III kerogen are mainly formed in organic matter. However, mesopores and macropores are significantly affected by the contents of clay minerals and quartz. The methane isothermal capacity experimental results show that the Langmuir volume, indicating the maximum methane adsorption capacity, of all the shale samples is between 0.78 cm3/g and 9.26 cm3/g. Moreover, methane is mainly adsorbed in micropores and developed in organic matter, whereas the influence of mesopores and macropores on the methane adsorption capacity of shale with type III kerogen is small. At different stages, the influencing factors of methane adsorption capacity are different. When the TOC content is <1.4% or >4.5%, the methane adsorption capacity is positively correlated with the TOC content. When the TOC content is in the range of 1.4–4.5%, clay minerals have obviously positive effects on the methane adsorption capacity.

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Section: Compositional Effects On Methane Adsorption Capacity In Shalsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Nanostructure Effect on Methane Adsorption Capacity of Shale with Type III Kerogen

et al. 2020

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“…Moreover, Ortiz Cancino [36] observed no correlation between the TOCnormalized adsorption amount and clay mineral content in the case of their shale samples, showing that clay minerals do not contribute significantly to methane adsorption. This phenomenon was also observed by Gasparik and Shabani [17,37].…”

Section: Introductionsupporting

confidence: 79%

Clarifying the Effect of Clay Minerals on Methane Adsorption Capacity of Marine Shales in Sichuan Basin, China

Wang

Zhou

Zhang³

et al. 2021

Energies

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The effect of clay minerals on the methane adsorption capacity of shales is a basic issue that needs to be clarified and is of great significance for understanding the adsorption characteristics and mechanisms of shale gas. In this study, a variety of experimental methods, including XRD, LTNA, HPMA experiments, were conducted on 82 marine shale samples from the Wufeng–Longmaxi Formation of 10 evaluation wells in the southern Sichuan Basin of China. The controlling factors of adsorption capacities were determined through a correlation analysis with pore characteristics and mineral composition. In terms of mineral composition, organic matter (OM) is the most key methane adsorbent in marine shale, and clay minerals have little effect on methane adsorption. The ultra-low adsorption capacity of illite and chlorite and the hydrophilicity and water absorption ability of clay minerals are the main reasons for their limited effect on gas adsorption in marine shales. From the perspective of the pore structure, the micropore and mesopore specific surface areas (SSAs) control the methane adsorption capacity of marine shales, which are mainly provided by OM. Clay minerals have no relationship with SSAs, regardless of mesopores or micropores. In the competitive adsorption process of OM and clay minerals, OM has an absolute advantage. Clay minerals become carriers for water absorption, due to their interlayer polarity and water wettability. Based on the analysis of a large number of experimental datasets, this study clarified the key problem of whether clay minerals in marine shales control methane adsorption.

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“…Different researchers thus apply a variety of assumptions to interpret the mechanism of supercritical methane adsorption in shales. Experimentalists in unconventional gas industry adopt the historical idea that the density of the adsorbed methane in shale can be treated as liquid or quasi-liquid, and that the quasi-liquid density of methane is larger than the corresponding gaseous phase density but lower than the liquid density (Weniger et al, 2010;Gasparik et al, 2012Gasparik et al, & 2015Gensterblum et al, 2013;Clarkson et al, 2013;Yang et al, 2105;Tang et al, 2016Tang et al, , 2017aTang et al, , 2017bTang et al, & 2017cTian et al, 2016;Zhou et al, 2018;Li et al, 2018a;Shabani et al, 2018;Li et al, 2018b;Hu et al, 2018). This assumption is valid for subcritical gas adsorption in micropore (<2 nm) rich porous materials due to the nanoconfinement effect.…”

Section: Introductionmentioning

confidence: 99%

New perspectives on supercritical methane adsorption in shales and associated thermodynamics

Tang

Ripepi

Rigby

et al. 2019

Journal of Industrial and Engineering Chemistry

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Methane sorption and storage characteristics of organic-rich carbonaceous rocks, Lurestan province, southwest Iran

Cited by 61 publications

References 22 publications

Nanostructure Effect on Methane Adsorption Capacity of Shale with Type III Kerogen

Nanostructure Effect on Methane Adsorption Capacity of Shale with Type III Kerogen

Clarifying the Effect of Clay Minerals on Methane Adsorption Capacity of Marine Shales in Sichuan Basin, China

New perspectives on supercritical methane adsorption in shales and associated thermodynamics

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