The effect of Cenozoic basin inversion on coal-bed methane in Liupanshui Coalfield, Southern China

Chen, Biying; Stuart, Finlay M.; Xu, Sheng; Gyӧre, Domokos; Liu, Cong‐Qiang

doi:10.1016/j.coal.2021.103910

Cited by 6 publications

(3 citation statements)

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“…14-4 14-5 14-6 14-7 14-8 14-9 14-10 The CBM geology in Guizhou is characterized by high gas content, pressure, and resource abundance, indicating superior CBM resource potential [26]. There are a total of 40 coal seams in the Dahebian block in Liupanshui coalfield, with a minable thickness of about 20 m. The total potential coal resources are 103.881 million tons [27].…”

Section: Geological Conditions In the Study Areamentioning

confidence: 99%

“…Previous studies have shown that the burial depth of coal seams in the Dahebian block exceeds 3000 m in the Early and Middle Triassic. The Yanshanian and Himalayan orogenies since the Late Jurassic have destroyed the prototype of the basin, leading to an inversion of 500-600 m, as well as uplift and erosion [27]. The formation of the Liupanshui coal basin was formed under the control of the Ziyun-Yadoufault (the northwest section of the WZL fault zone) and the Liupanshui fault [31] (Figure 2).…”

Section: Geological Development History Of Coal-bearing Basinmentioning

confidence: 99%

Section: Geological Development History Of Coal-bearing Basinmentioning

confidence: 99%

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Paleotectonic Stress and Present Geostress Fields and Their Implications for Coalbed Methane Exploitation: A Case Study from Dahebian Block, Liupanshui Coalfield, Guizhou, China

Wang,

Zhou

et al. 2023

Energies

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The macroscopic structural fractures (joints) and geostress distribution characteristics of coal reservoirs are important factors affecting the exploitation of coalbed methane (CBM). In this study, the joints in the sedimentary strata of the Dahebian block in Liupanshui area, Guizhou Province were investigated. Directional coal samples were collected for observation and statistical analysis of coal microfractures, the paleotectonic stress fields of the study area were reconstructed, and the tectonic evolution was elucidated. The geostress distribution characteristics of the target coal seam (coal seam No. 11, P3l) in the study area were analyzed using the finite element numerical simulation method. The results indicate that the structural evolution of the Dahebian syncline in the study area can be divided into two stages. The Late Jurassic–Early Cretaceous stage (Early Yanshanian) is the first stage. Affected by the sinistral strike slip of the Weining–Ziyun–Luodian (WZL) fault zone, the derived stress field in the study area exhibits maximum principal stress (σ1) in the NEE–SWW direction. The Late Cretaceous stage (Late Yanshanian) is the second stage. Affected by the dextral strike slip of the WZL fault zone, the derived stress field exhibits σ1 in the NNW–SSE direction. The folds and faults formed in the first stage were modified by the structural deformation in the second stage. The dominant strikes of joints in the sedimentary strata are found to be in the NW–NNW (300°–360°) and NE (30°–60°) directions, with dip angles mostly ranging from 60° to 90°. The dominant strikes of coal microfractures are in the NW (285°–304°) and NE (43°–53°) directions. The distribution of geostress in the study area is characterized by high levels of geostress in the syncline center, decreasing towards the surrounding periphery. The overall trend of the geostress contour line is similar to the shape of the syncline and is influenced by folds and faults. The σ1 of coal seam No. 11 is vertical stress. The prediction results show that the joint density of coal seam No. 11 in the block is 36–50 joints/m, and the shape of the joint density contour line is also affected by the axial direction of the Dahebian syncline and the surrounding faults. The variation in coal seam joint density and the control effect of geostress on joints opening or closing affects the permeability of coal reservoirs. The study results provide significant guidance for the exploitation of CBM.

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Section: Geological Conditions In the Study Areamentioning

confidence: 99%

Section: Geological Development History Of Coal-bearing Basinmentioning

confidence: 99%