Pore structure and sorption capacity investigations of Ediacaran and Lower Silurian gas shales from the Upper Yangtze platform, China

Hu, Zhazha; Gaus, Garri; Seemann, Timo; Zhang, Qian; Littke, Ralf; Fink, Reinhard

doi:10.1007/s40948-021-00262-5

Cited by 8 publications

(16 citation statements)

References 84 publications

(132 reference statements)

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“…The adsorption capability of CH 4 on the shale matrices displays a slight positive correlation with the TOC content. Such a trend was widely reported in previous studies. ,− The organic matter-hosted pores are the main pore type of marine shale reservoirs in southern China, which mainly include spherical pores, elliptical pores, linear pores, and so forth. , Specifically, the organic matter–hosted pores are of large porosity of up to 20.2% and have high connectivity as well. , Furthermore, the strong fluid–wall interaction always occurs in organic matter–hosted pores, which is favorable for CH 4 adsorption . Therefore, the increase in organic matter abundance could strengthen the adsorption capability of shale matrices for CH 4 .…”

Section: Resultssupporting

confidence: 59%

“…Furthermore, the CH 4 adsorption capability of shale matrices is mainly dominated by their organic matter and inorganic minerals. Specifically, the kerogen contained in organic matter and clay minerals, typically including montmorillonite and illite, play a crucial role in CH 4 adsorption. − Studies have verified the positive impact of kerogen on CH 4 adsorption; − however, the clay mineral dependence is still controversial. In some studies, the effect of clay minerals on the CH 4 adsorption capability cannot be ignored, especially for the shale matrices with low organic matter contents .…”

Section: Introductionmentioning

confidence: 99%

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Methane Adsorption Equilibrium on Marine Gas-Bearing Shale Matrices: The Polanyi Potential Theory Approach

Tang

Cai

et al. 2023

Ind. Eng. Chem. Res.

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To reveal the feasibility of the Polanyi potential theory toward methane (CH4) adsorption equilibrium on marine gas-bearing shale matrices, a quantitative analysis method was proposed to elaborate adsorption mechanisms on CH4–shale systems based on CH4 adsorption data. Additionally, the potential theory was employed to generate CH4 adsorption isotherms on shale matrices at a given temperature and further distinguish organic matter and clay mineral dependences of CH4 adsorption. Ultimately, the potential theory was used to plot the curves of CH4 adsorption capacity versus various burial depths of shale reservoirs. Results indicate that CH4 adsorption on marine gas-bearing shale matrices typically follows micropore filling. Hence, the supercritical Dubinin–Astakhov (D–A) model derived from the potential theory is capable of describing CH4 adsorption equilibrium on shale matrices. The adsorption characteristic curve via combining the Polanyi potential theory and the supercritical D–A model well coincides within the entire adsorption temperature range. Therefore, the adsorption characteristic curve is competent to predict CH4 adsorption isotherms at a given temperature. Moreover, the Polanyi potential theory approach suggests that the organic matter content of shale matrices shows a slightly positive correlation with its adsorption capability for CH4. The clay minerals exert a minor impact on the CH4 adsorption capability of the shale matrices with high organic matter contents. Instead, the contribution of clay minerals to the shale matrices with low TOC cannot be neglected. Finally, the potential theory is capable of plotting the variation curves of the CH4 adsorption capacity versus burial depth. The Polanyi potential theory can well estimate the CH4 adsorption capability of shale matrices with various burial depths, thereby benefiting shale gas assessment and production.

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Section: Resultssupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Methane Adsorption Equilibrium on Marine Gas-Bearing Shale Matrices: The Polanyi Potential Theory Approach

Tang

Cai

et al. 2023

Ind. Eng. Chem. Res.

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“…36 Apart from the bulk mineralogical analysis, oriented clay samples were prepared from all rock samples and then measured on the X-ray diffractometer. Detailed preparation guidelines can be found in the study by Hu et al 3 Specific clay mineral identification and quantification were made with Profex software.…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

“…Effect of thermal maturity on the Langmuir sorption capacity of organic matter is not clear at present as the superimposed influence of sample heterogeneity, particle size, burial history, and clay minerals on the overall sorption capacity is significant and larger than the "inverted U-shaped trend" due to thermal maturity. 3,13,14,21 As a part of inorganic constituent of shale or coal, clay minerals contribute significantly to the sorption capacity due to the relatively high specific surface area, especially for organic-lean shales. 22 For different types of clay minerals, a decreasing trend of sorption capacity was identified in this order: smectite > I−S mixed layer > kaolinite > chlorite > illite.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Shale Gas Potential of Marine-Continental Transitional Longtan Formation from Southwestern Guizhou Province, China

Hu,

Klitzsch,

Jin

et al. 2023

Energy Fuels

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In the past 2 decades, the shale gas industry and academia in China have mainly focused on marine shales due to the commercial success of marine shale plays in the United States. Marine-continental transitional shales have long been overlooked for high clay content, thin thickness, and poor lateral continuity. However, recent exploration activities and on-site canister desorption data indicate a high exploitation potential for these shales. Therefore, we comprehensively studied transitional Longtan shale and coal samples from southwestern Guizhou Province using petrophysical, mineralogical, petrographic, and geochemical methods. The shale samples have total organic carbon (TOC) contents between 2.9 and 11.6%, porosity of 3.12%, vitrinite reflectances between 1.2 and 1.6%, and Langmuir sorption capacity between 0.198 and 0.469 mmol/g. Thus, Longtan shale shows similar or even superior properties compared to other commercially exploited gas shale formations. Compared to the interbedded coals, Longtan shales exhibit higher porosity, larger N 2 mesopore volume, and smaller CO 2 micropore volume. For Longtan coals, both the maximum and Langmuir sorption capacities correlate with TOC contents. However, no such relationship exists in Longtan shales, which is attributed to the high average contribution (approximately 52%) of clay minerals to the total Langmuir sorption capacity. While the sorption capacity of Longtan shale depends on the micropore and fine mesopore amounts of clay minerals and organic matter, it is mainly controlled by the micropores of organic matter in Longtan coal. Based on our mathematic model, maximal gas-in-place of Longtan coal and shale occurs at depths between 700 and 800 m and in a much wider depth range between 1100 and 2100 m, respectively.

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“…Mercury injection porosimetry (MIP) and low-pressure nitrogen or carbon dioxide adsorption are widely used to characterize the pore structure of sedimentary rocks [20][21][22]. However, these characterizations are based on simplified pore geometry assumptions.…”

Section: Introductionmentioning

confidence: 99%

An Integrated Imaging Study of the Pore Structure of the Cobourg Limestone—A Potential Nuclear Waste Host Rock in Canada

Klaver

et al. 2021

Minerals

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With the development of imaging technology, tools to quantitatively describe pore structure, morphology, and connectivity have been widely applied on low permeable rocks; however, it is still questionable to what extent this information can be used to predict permeability. Applicability and comparability of different techniques are discussed here for the Middle Ordovician Cobourg limestone (Canada), a rock dominated by calcite grains of variable sizes (µm–cm) and heterogeneously distributed quartz, dolomite, pyrite, and meshy clay minerals. Absolute porosities determined by helium pycnometry (HP) in literature are approximately 1.6% (±0.9%), and gas permeabilities range from 10−20 to 10−19 m2. Porosities obtained from BIB-SEM are much smaller compared to those from HP (16–69% of HP). Pores found in clays are smaller, slit-shaped, and more densely spaced when compared to those in calcite minerals. Connectivity between pores could not be resolved with 3D micro-CT or FIB-SEM reconstructions, which have a resolution limit of 8 µm and 10 nm, respectively. However, assuming the pores to be connected, laboratory-derived permeability data could be fitted using a simple capillary bundle model, including information about the visible pore size distributions obtained from BIB-SEM images and a tortuosity range of 8 to 15.

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Pore structure and sorption capacity investigations of Ediacaran and Lower Silurian gas shales from the Upper Yangtze platform, China

Cited by 8 publications

References 84 publications

Methane Adsorption Equilibrium on Marine Gas-Bearing Shale Matrices: The Polanyi Potential Theory Approach

Methane Adsorption Equilibrium on Marine Gas-Bearing Shale Matrices: The Polanyi Potential Theory Approach

Assessment of Shale Gas Potential of Marine-Continental Transitional Longtan Formation from Southwestern Guizhou Province, China

An Integrated Imaging Study of the Pore Structure of the Cobourg Limestone—A Potential Nuclear Waste Host Rock in Canada

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