Influence of organic matter type on porosity development in the Wufeng-Longmaxi Shale: A combined microscopy, neutron scattering and physisorption approach

Piane, Claudio Delle; Ansari, Humera; Li, Zhongsheng; Mata, Jitendra; Rickard, William D.A.; Pini, Ronny; Dewhurst, David N.; Sherwood, Neil

doi:10.1016/j.coal.2021.103880

Cited by 16 publications

(19 citation statements)

References 57 publications

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“…Sample ML has been obtained from a well in the postmature part of the Marcellus shale in the northeast of Pennsylvania . The Longmaxi shale samples (LG3, LG4, and LG5) were retrieved from sections WX-1, WX-5 (in the same well), and WX-7 (in another well) in the Jiaoshiba area (Fuling gas field) and Dingshan area (west of Fuling), respectively . The mineralogy of all samples is reported in Table S1, and details on the associated experimental procedures can be found in the publications listed above.…”

Section: Methodsmentioning

confidence: 99%

“…The samples are composed of a variety of clay minerals, and they differ in both their organic content and degree of thermal maturity. The Marcellus and Bowland shales have a maximum vitrinite reflectance of approximately 4.0% and 1.1%, respectively, and the Longmaxi shales have an equivalent vitrinite reflectance (as they are vitrinite-free) of approximately 3.3–4.6% . This is also reflected in their visual appearance: the B samples are light gray, while ML and LG samples are much darker and almost black.…”

Section: Methodsmentioning

confidence: 99%

“… a Data have been obtained from the following references: B6/B8, unpublished measurements from University College London; LG4, Delle Piane et al; and ML, Delle Piane et al …”

Section: Methodsmentioning

confidence: 99%

“…48 The Longmaxi shale samples (LG3, LG4, and LG5) were retrieved from sections WX-1, WX-5 (in the same well), and WX-7 (in another well) in the Jiaoshiba area (Fuling gas field) and Dingshan area (west of Fuling), respectively. 49 The mineralogy of all samples is reported in Table S1, and details on the associated experimental procedures can be found in the publications listed above. The samples are composed of a variety of clay minerals, and they differ in both their organic content and degree of thermal maturity.…”

Section: Methodsmentioning

confidence: 99%

“…The Marcellus and Bowland shales have a maximum vitrinite reflectance of approximately 4.0% 48 and 1.1%, 46 respectively, and the Longmaxi shales have an equivalent vitrinite reflectance (as they are vitrinite-free) of approximately 3.3−4.6%. 49 This is also reflected in their visual appearance: the B samples are light gray, while ML and LG samples are much darker and almost black. All shale samples were prepared for the study by crushing and sieving to below a 100 μm particle size.…”

Section: Methodsmentioning

confidence: 99%

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Hybrid Pore-Scale Adsorption Model for CO₂ and CH₄ Storage in Shale

et al. 2022

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Making reliable estimates of gas adsorption in shale remains a challenge because the variability in their mineralogy and thermal maturity results in a broad distribution of pore-scale properties, including size, morphology and surface chemistry. Here, we demonstrate the development and application of a hybrid pore-scale model that uses surrogate surfaces to describe supercritical gas adsorption in shale. The model is based on the lattice density functional theory (DFT) and considers both slits and cylindrical pores to mimic the texture of shale. Inorganic and organic surfaces associated with these pores are accounted for by using two distinct adsorbate−adsorbent interaction energies. The model is parametrized upon calibration against experimental adsorption data acquired on adsorbents featuring either pure clay or pure carbon surfaces. Therefore, in its application to shale, the hybrid lattice DFT model only requires knowledge of the shalespecific organic and clay content. We verify the reliability of the model predictions by comparison against high-pressure CO 2 and CH 4 adsorption isotherms measured at 40 °C in the pressure range 0.01−30 MPa on four samples from three distinct plays, namely, the Bowland (UK), Longmaxi (China), and Marcellus shale (USA). Because it uses only the relevant pore-scale properties, the proposed model can be applied to the analysis of other shales, minimizing the heavy experimental burden associated with highpressure experiments. Moreover, the proposed development has general applicability meaning that the hybrid lattice DFT can be used for the characterization of any adsorbent featuring morphologically and chemically heterogeneous surfaces.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“… a Data have been obtained from the following references: B6/B8, unpublished measurements from University College London; LG4, Delle Piane et al; and ML, Delle Piane et al …”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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