Rare Earth Element Characteristics of Shales from Wufeng–Longmaxi Formations in Deep-Buried Areas of the Northern Sichuan Basin, Southern China: Implications for Provenance, Depositional Conditions, and Paleoclimate

Xiao, Bin; Guo, Dongxu; Li, Sheng; Xiong, Shuzhen; Jing, Zhaoyi; Feng, Mingfei; Fu, Xiang; Zhao, Zhonghai

doi:10.1021/acsomega.3c03086

Cited by 13 publications

(10 citation statements)

References 60 publications

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“…(3) In terms of microfluidic experiments. Microfluidics is a method of visualizing multiphase flow in porous structures to obtain experimental data. − This method focuses on studying the relationship between permeability and effective porosity in porous media. , …”

Section: Experimental Methods For Gas Injection Enhanced Coal Seam Me...mentioning

confidence: 99%

Experimental Investigations on Enhanced Coal Seam Methane Extraction by Injecting Gas: A Review

Wen,

Fan,

Jiang

et al. 2024

Energy Fuels

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Enhanced coal seam methane extraction by injecting gas is an emerging technology to both reduce greenhouse gas emissions and improve coal seam methane recovery. In this paper, the experimental and field research progress on gas injection for driving and displacing coal seam methane are reviewed from the perspectives of the micro, meso, and macro scales. The microscopic scale perspective involves intuitively analyzing the interaction process and relationship between strong adsorption gases (CO 2 , LCO 2 , and SCCO 2 ) and relatively weak adsorption gases (CH 4 , N 2 ) injected into coal samples, the changes in the number of micropores, mesopores, and macropores in coal samples by using NMR and low-temperature nitrogen adsorption equipment, and visualizing the multiphase flow process in pore structures using microfluidic methods. For the mesoscopic scale, multiple equipment means (SEM, NMR, liquid nitrogen adsorption, etc.) were used to quantitatively analyze the effects of different fracture widths, different degrees of metamorphism, and composition on gas seepage and adsorption−desorption rate. For the macroscopic scale, the physical and mechanical properties of coal and rock were analyzed using different pseudotriaxial or true triaxial seepage experimental equipment during the changes of gas injection process parameters and the effects of axial pressure and confining pressure, especially in adsorption−desorption and seepage related experiments in single component and multicomponent gases. Moreover, from future perspectives, some key, emerging, and intelligent technologies and equipment of gas injection enhanced coal seam methane extraction will be put forward.

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Section: Experimental Methods For Gas Injection Enhanced Coal Seam Me...mentioning

confidence: 99%

Experimental Investigations on Enhanced Coal Seam Methane Extraction by Injecting Gas: A Review

Wen,

Fan,

Jiang

et al. 2024

Energy Fuels

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“…Coal particle methane desorption is a comprehensive course of methane desorption, diffusion in coal, and transfusion in fractures. With the increase in the number of desorption damage tests, the variation in the interior structure of coal is more intense, which will have different effects on the above three processes. − Among them, the variation in gas diffusion ability created by the variation in coal damage is the significant reason for the change in methane desorption amount.…”

Section: Quantitative Index Of Desorption Damagementioning

confidence: 99%

Characterization of Coal Particle Methane Desorption and Optimization of Desorption Model Based on Desorption Damage

Fu,

Liu,

et al. 2024

ACS Omega

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In view of the current situation where most studies on gas desorption characteristics are limited to the atmospheric pressure desorption environment, we have independently developed a coal methane desorption instrument to test the nonatmospheric pressure desorption characteristics for coal particle gas beneath the condition of desorption damage. The instrument can arbitrarily adjust the gas pressure in the range of measurement while controlling the instantaneous release of excess gas to keep the desorption environment pressure constant. We measured the methane desorption amount of coal samples with different desorption times within 3 h and calculated the desorption velocity. The results show that the final desorption amount and desorption velocity of gas scale up with the increase of times, and the final desorption amount of coal sample W-01 increases the most, which is 18.5%. With the passage of time, the diffusion coefficient decreases gradually, and the number of desorption times is directly proportional to the diffusion coefficient. Its relative deviation of diffusion coefficient between different desorption times of the same coal sample can reach up to 40%, and the desorption time in the range of 5 to 30 min is the area with high relative deviation. A quantitative index K i of a double-parameter damage model based on desorption conditions and adsorption pressure is proposed, and the damage extent of each sample is evaluated. The damage quantitative index of coal sample W-01 is the highest, which is 0.87. The methane desorption model of coal under the condition of desorption damage is constructed, and more than 30 groups of experiments are verified.

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“…All of the above studies introduce the characterization of coal sample permeability into the microlevel through CT scanning and three-dimensional reconstruction technology but with the ignorance of the influence of the size of the model after three-dimensional reconstruction on the permeability of coal sample . In this paper, CT scanning is used to characterize and reconstruct the micropores and fractures of coal with the purpose of calculating the permeability of three-dimensional models at different sizes.…”

Section: Introductionmentioning

confidence: 99%

Scale Effect of Coal Porosity and Permeability Characteristics Based on CT 3D Reconstruction from a Microperspective

Fan,

Jiang,

Fan

et al. 2024

Energy Fuels

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In order to explore the impact of the scale effect on the coal seepage from a microscopic perspective, CT scanning experiments were carried out on coal samples selected from the Zhangcun Coal Mine in Shanxi Province. The scanned images were processed by means of the Avizo software, and the real pore fracture model of coal samples was established through the three-dimensional reconstruction technology. Based on the qualitative characterization of pores and fissures in the model, the microstructure of pores and fissures in coal is analyzed. The influence of the scale effect on the porosity and permeability characteristics of a coal seam is discussed by numerical simulation of the representative pores and fissures. The results show that the fractures in the coal sample are developed and have strong connectivity. 87% of the fractures are longer than 5000 μm and wider than 1000 μm. The permeability of coal samples is between 0.079 and 0.298 mD. With the increase of the scale of coal samples, the change process of the permeability can be divided into three stages: gradually increasing, slowly decreasing, and keeping steady. From the microscopic perspective, the porosity and permeability of coal samples are in accord with the cubic function relationship.

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Rare Earth Element Characteristics of Shales from Wufeng–Longmaxi Formations in Deep-Buried Areas of the Northern Sichuan Basin, Southern China: Implications for Provenance, Depositional Conditions, and Paleoclimate

Cited by 13 publications

References 60 publications

Experimental Investigations on Enhanced Coal Seam Methane Extraction by Injecting Gas: A Review

Experimental Investigations on Enhanced Coal Seam Methane Extraction by Injecting Gas: A Review

Characterization of Coal Particle Methane Desorption and Optimization of Desorption Model Based on Desorption Damage

Scale Effect of Coal Porosity and Permeability Characteristics Based on CT 3D Reconstruction from a Microperspective

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