Model construction of micro-pores in shale: A case study of Silurian Longmaxi Formation shale in Dianqianbei area, SW China

Chen, Keluo; Zhang, Tingshan; Chen, Xiaohui; He, Yingjie; Liang, Xing

doi:10.1016/s1876-3804(18)30046-6

Cited by 80 publications

(37 citation statements)

References 15 publications

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“…The adsorption/desorption isotherms presented in Figure 2 represent a type IV isotherm with a small H3 hysteresis loop observed in the p / p 0 range of 0.8–1.0. It indicates that samples belong to the mesopore group with groove pores structures [ 45 ]. The inset figure in Figure 2 shows the pore size curve, determined from the adsorption branch of the isotherm.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides

et al. 2021

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Copper-containing mixed metal oxides are one of the most promising catalysts of selective catalytic oxidation of ammonia. These materials are characterized by high catalytic efficiency; however, process selectivity to dinitrogen is still an open challenge. The set of Cu-Zn-Al-O and Ce/Cu-Zn-Al-O mixed metal oxides were tested as catalysts of selective catalytic oxidation of ammonia. At the low-temperature range, from 250 °C up to 350 °C, materials show high catalytic activity and relatively high selectivity to dinitrogen. Samples with the highest Cu loading 12 and 15 mol.% of total cation content were found to be the most active materials. Additional sample modification by wet impregnation of cerium (8 wt.%) improves catalytic efficiency, especially N2 selectivity. The comparison of catalytic tests with results of physicochemical characterization allows connecting the catalysts efficiency with the form and distribution of CuO on the samples’ surface. The bulk-like well-developed phases were associated with sample activity, while the dispersed CuO phases with dinitrogen selectivity. Material characterization included phase composition analysis (X-ray powder diffraction, UV-Vis diffuse reflectance spectroscopy), determination of textural properties (low-temperature N2 sorption, scanning electron microscopy) and sample reducibility analysis (H2 temperature-programmed reduction).

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Section: Resultsmentioning

confidence: 99%

Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides

et al. 2021

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“…As a multi-stage superimposed basin developed on the Upper Yangtze platform, the Dianqianbei Depression is adjacent to the southern margin of the Sichuan Basin in the north, the Dianqian uplift in the south (Fig. 1), and the Diandongbei Depression in the west (Chen et al 2018c). The depression is featured by strong tectonics in the south and west, and it is tectonically a typical slotted east-west extended fold belt composed of wide anticlines and closed synclines (Liang et al 2011;He et al 2019).…”

Section: Geological Settingmentioning

confidence: 99%

Geochemical characteristics and genetic mechanism of the high-N2 shale gas reservoir in the Longmaxi Formation, Dianqianbei Area, China

Zhang

et al. 2020

Pet. Sci.

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As an important pilot target for shale gas exploration and development in China, the Longmaxi Formation shale in the Dianqianbei Area is characterized by high content of nitrogen, which severely increases exploration risk. Accordingly, this study explores the genesis of shale gas reservoir and the mechanism of nitrogen enrichment through investigating shale gas compositions, isotope features, and geochemical characteristics of associated gases. The high-nitrogen shale gas reservoir in the Longmaxi Formation is demonstrated to be a typical dry gas reservoir. Specifically, the alkane carbon isotope reversal is ascribed to the secondary cracking of crude oil and the Rayleigh fractionation induced by the basalt mantle plume. Such a thermogenic oil-type gas reservoir is composed of both oil-cracking gas and kerogen-cracking gas. The normally high nitrogen content (18.05%–40.92%) is attributed to organic matter cracking and thermal ammoniation in the high-maturity stage. Specifically, the high heat flow effect of the Emeishan mantle plume exacerbates the thermal cracking of organic matter in the Longmaxi Formation shale, accompanied by nitrogen generation. In comparison, the abnormally high nitrogen content (86.79%–98.54%) is ascribed to the communication between the atmosphere and deep underground fluids by deep faults, which results in hydrocarbon loss and nitrogen intrusion, acting as the key factor for deconstruction of the primary shale gas reservoir. Results of this study not only enrich research on genetic mechanism of high-maturity N2 shale gas reservoirs, but also provide theoretical guidance for subsequent gas reservoir resource evaluation and well-drilling deployment in this area.

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“…(1) Atomic-scale geometrically heterogeneous surfaces: statistical self-similarity, a typical geometric feature of surface heterogeneity that can hardly be described by Euclidean geometry, is a ubiquitous characteristic of most materials in nature . Thanks to the fractal theory advanced by Mandelbrot, , the surface fractal dimension functions as an applicable measure of surface geometric heterogeneity. − The fractal pore morphology has been examined by mercury intrusion porosimetry (MIP), − the fractal Frenkel–Halsey–Hill (FHH) adsorption isotherm equation based on nitrogen adsorption, − ,− nuclear magnetic resonance, ,, small-angle and ultrasmall-angle neutron scattering, ,− ...…”

Section: Introductionmentioning

confidence: 99%

“…These findings indicate marked surface geometric heterogeneity at the atomic scale. (2) Slitlike shape: the pore shape can be determined from the shape of the hysteresis loop of the nitrogen adsorption and desorption isotherms (see refs − , , , , − , − , − , − , − , , , − , − , , , , ) according to the classification by the International Union of Pure and Applied Chemistry (IUPAC) or by the field emission scanning electron microscope (see refs , , , − , , , , , , − , , , , , , , , , , , , , ) and MIP. ,,, The summary statistics reveal that slit pores constitute the largest...…”

Section: Introductionmentioning

confidence: 99%

“…(3) Nanoscale average diameter: IUPAC refreshed the pore classification by size, defining nanopores as the pores with diameters to an upper limit of about 100 nm . Usually, the average pore diameter ( d ) is calculated from the cylindrical pore model ( d = 4 v / a ) with the specific pore surface area ( a ) and the specific pore volume ( v ) obtained in carbon dioxide or nitrogen adsorption experiments (see refs − , − , − , , , − , − , , , − , , , , ). The distribution indicates that the overwhelming majority of the average diameters lies in the range of 0–50 nm (Figure c), which conforms to the definition of nanopores.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Methane, Nitrogen, and Carbon Dioxide in Atomic-Scale Fractal Nanopores by Monte Carlo Simulation I: Single-Component Adsorption

et al. 2019

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The atomic-scale surface fractal, which can notably affect gas adsorption, is a prominent form of geometric heterogeneity at the surfaces of the pore structure of shale. Systematically evaluating the effect of the atomic-scale surface fractal on gas adsorption remains an open research question. In this study, we investigated the single-component adsorption of methane, nitrogen, and carbon dioxide in fractal shale nanopores at 298 K by Monte Carlo simulations in the grand canonical ensemble. We carved out the atomistic nanopore models by fractal surfaces created using the diamond-square algorithm with the surface fractal dimension ranging from 2 to 2.9. We evaluated the variation in the adsorption energy, the absolute and excess adsorbed density, and the adsorption layer density with the surface fractal dimension, which indicates that the atomic-scale surface fractal is an unfavorable factor for the single-component adsorption of methane, nitrogen, and carbon dioxide. The findings may enhance our understanding of the mechanism for heterogeneous gas adsorption in shale.

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Model construction of micro-pores in shale: A case study of Silurian Longmaxi Formation shale in Dianqianbei area, SW China

Cited by 80 publications

References 15 publications

Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides

Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides

Geochemical characteristics and genetic mechanism of the high-N2 shale gas reservoir in the Longmaxi Formation, Dianqianbei Area, China

Adsorption of Methane, Nitrogen, and Carbon Dioxide in Atomic-Scale Fractal Nanopores by Monte Carlo Simulation I: Single-Component Adsorption

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