Natural Resources Research, Journal Year: 2025, Volume and Issue: unknown
Published: April 18, 2025
Language: Английский
Energy, Journal Year: 2023, Volume and Issue: 282, P. 128277 - 128277
Published: July 6, 2023
Language: Английский
Citations
15
Processes, Journal Year: 2023, Volume and Issue: 11(11), P. 3093 - 3093
Published: Oct. 27, 2023
The potential of deep coalbed methane resources is substantial. Gas content an important parameter for resource assessment. At present, the gas test method commonly used shallow coal reservoirs not suitable determining content. Therefore, it urgent to establish a prediction This study aims quantitatively predict in and uncover its influencing factors. For this purpose, we selected Daning-Jixian area, region China with relatively advanced development methane, as case study. It established model adsorbed free through series experimental tests, encompassing content, quality, isothermal adsorption, nuclear magnetic resonance. sheds light on impact coal-rock characteristics, quality attributes, pore characteristics results show that dominates high metamorphic degree average proportion under reservoir burial depth 80.15%. approximately 1800~2000 m, turning point observed where begins decline. Beyond range, detrimental effect temperature surpasses beneficial pressure. Coal play major role controlling increase water ash yield significantly reduces adsorption performance reservoirs. increases depth, factors primarily being confining pressure porosity. micropores pores has adverse gas. gradually decreases while rises depth. cannot be overlooked exploration methane.
Language: Английский
Citations
14
ACS Omega, Journal Year: 2024, Volume and Issue: 9(13), P. 15468 - 15480
Published: March 20, 2024
Protective layer mining is one of the most effective measures to control outbursts coal seam gas in mines. Accurately grasping overlying rock movement and pressure-relief migration patterns under protective conditions a prerequisite for efficient surface coalbed methane extraction; it basis green emission reduction A physical model was established using Ji
Language: Английский
Citations
5
Physics of Fluids, Journal Year: 2023, Volume and Issue: 35(8)
Published: Aug. 1, 2023
Fracture networks are of significance in the production coalbed methane from unconventional reservoirs. However, complex distribution and geometry fracture make effective predictions their permeability difficult. This study obtains shape a natural network coal based on stereomicroscopy experiment analyzes structural characteristics using graph theory. The fractal scaling law for branch length fractures relationships among dimensions distribution, area, porosity, connectivity, ratio maximum to minimum established. A new model is developed theory, two important characteristics, namely, tortuosity considered. verified results previous studies seepage tests, influence characteristic parameters analyzed. show that increases with increasing dimension, proportionality coefficient, length, connectivity decreases dimension dip angle.
Language: Английский
Citations
13
Energy, Journal Year: 2023, Volume and Issue: 290, P. 130010 - 130010
Published: Dec. 15, 2023
Language: Английский
Citations
12
Energy & Fuels, Journal Year: 2023, Volume and Issue: 37(17), P. 12889 - 12904
Published: Aug. 16, 2023
Shale gas exploration and development is regarded as one of the vital areas in which breakthroughs are urgently needed. The Longmaxi Formation shale Weiyuan Block was considered a case study. Based on analysis physical evolution, burial history, thermal well hydrocarbon generation history shales, impact uplift amplitude reservoirs, transport pattern direction adjustment stage, enrichment discussed this results from study showed that (1) could reach maximum depth Late Middle Cretaceous, then there uplifting erosion strata, with an amount 2000–4200 m. (2) migration mostly contributed by Darcy flow slippage flow. In addition, to larger migration, about 100 times occurs 13.7% pores shale. (3) can be significantly impacted amplitude. reservoirs amplitudes higher than 3000 m lower differ terms their characteristics, pressure coefficients, concentrations. (4) separated into five categories based amplitudes, coefficients: lost reservoir, enriched reservoir first loss, loss enrichment, supply reservoir. Although occupies largest area, key zone for analysis, Block.
Language: Английский
Citations
11
Petroleum Science and Technology, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 20
Published: Jan. 2, 2025
Coalbed methane wells on the ground in coal mining areas are used to extract a large amount of gas from working face, but activities can cause strata movement, resulting casing deformation. Numerical simulation was study shear stress loading under thick alluvial conditions. The found that will have peak points at interface between aquifer, layer and bedrock, mudstone with intensity 49.9–77.1 MPa. point aquifer appear 4 m below floor as face is mined. junction bedrock increases linearly depth, appears just above junction. section fluctuates periodically lithology changes, mostly weak rock formations such mudstone. introduction non-uniform theory explains reasons for deformation these layers, proposes suggestions control. This provide reference formulation control methods.
Language: Английский
Citations
0
Gas Science and Engineering, Journal Year: 2025, Volume and Issue: 134, P. 205540 - 205540
Published: Jan. 8, 2025
Language: Английский
Citations
0
Minerals, Journal Year: 2025, Volume and Issue: 15(2), P. 116 - 116
Published: Jan. 24, 2025
To clarify the micropore structure and fractal characteristics of Danning–Jixian block on eastern margin Ordos Basin, this study focuses deep coal rock Benxi Formation in that area. On basis an analysis quality physical properties, qualitative quantitative studies pore structures with different diameters were conducted via techniques such as field emission scanning electron microscopy (FE-SEM), low-pressure CO2 adsorption (LP-CO2A), low-temperature N2 (LT-N2A), high-pressure mercury intrusion (HPMI). By applying theory integrating results from LP-CO2A, LT-N2A, HPMI experiments, dimensions pores obtained to characterize complexity heterogeneity samples. The indicate reservoirs have abundant nanometer-scale organic matter gas pores, tissue a small number intergranular showing strong influenced by microscopic components forms distribution matter. exhibits significant cross-scale effects is predominantly composed micropores account for more than 90% total volume; affected mainly degree coalification, vitrinite group, ash yield. Fractal reveals macropores greater mesopores micropores. This may be attributed smaller sizes concentrated distributions micropores, which are less diagenesis, resulting simpler lower dimensions. In contrast, macropores, larger broader distributions, exhibit diverse origins reflecting heterogeneity. storage space self-similarity facilitate occurrence, flow, extraction coalbed methane.
Language: Английский
Citations
0
Fuel, Journal Year: 2025, Volume and Issue: 390, P. 134666 - 134666
Published: Feb. 17, 2025
Language: Английский
Citations
0