Model of T-Type Fracture in Coal Fracturing and Analysis of Influence Factors of Fracture Morphology

Li, Yuwei; Jia, Dechang; Li, Wei; Zhang, Kunpeng

doi:10.3390/en11051196

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…Combined with finite element simulation, the fractures of a coal reservoir can be predicted [21][22][23]. In the hydraulic fracturing of CBM development, the stress state of the coal reservoir also affects the shape, type, and expansion direction of fractures [24,25]. Clarifying the advantageous orientation of fractures and the principal stress orientation in coal reservoirs can be beneficial in the design of CBM wells [11].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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Numerical investigation of the interactions between hydraulic fracture and bedding planes with non-orthogonal approach angle

Tang

et al. 2018

Engineering Fracture Mechanics

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Experimental of hydraulic fracture propagation using fixed-point multistage fracturing in a vertical well in tight sandstone reservoir

Yang

Zhao

et al. 2018

Journal of Petroleum Science and Engineering

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Model of T-Type Fracture in Coal Fracturing and Analysis of Influence Factors of Fracture Morphology

Cited by 3 publications

References 24 publications

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

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

Numerical investigation of the interactions between hydraulic fracture and bedding planes with non-orthogonal approach angle

Experimental of hydraulic fracture propagation using fixed-point multistage fracturing in a vertical well in tight sandstone reservoir

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