Thermal effects of magmatic sills on coal seam metamorphism and gas occurrence

Wang, Liang; Cheng, Long-biao; Cheng, Yuanping; Yin, Guangzhi; Cai, Chun-cheng; Xu, Chao; Jin, Kan

doi:10.1007/s00445-014-0803-0

Cited by 27 publications

(18 citation statements)

References 25 publications

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“…Along with the magma squeezed into the strata with an average thickness of 120 m, the coal mass of the No. 7 coal seam under extremely thick magmatic rock was affected by both the gravity stress of the overlying rocks and the large extrusion stress caused by the magmatic intrusion (Stewart et al, 2005;Wang et al, 2014b), and the extrusion stress proportionally increased as the thickness of the overlying magmatic rocks increased. Geological exploration indicates that the thickest of the overlying magmatic rocks in the No.…”

Section: Damage Caused By the Magmatic Intrusionmentioning

confidence: 98%

Pulverization characteristics of coal from a strong outburst-prone coal seam and their impact on gas desorption and diffusion properties

Guo

Wang

Ren

et al. 2016

Journal of Natural Gas Science and Engineering

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Section: Damage Caused By the Magmatic Intrusionmentioning

confidence: 98%

Pulverization characteristics of coal from a strong outburst-prone coal seam and their impact on gas desorption and diffusion properties

Guo

Wang

Ren

et al. 2016

Journal of Natural Gas Science and Engineering

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“…The magmatic stratum has thermal evolution and sealing effects [4]. Firstly, the thermal evolution of the magnetic stratum promotes secondary hydrocarbon generation of coal seams and changes the metamorphism degree of coal seams and pore/fracture structure of coals, thus increasing content and pressure of coal seam gases [150]. Secondly, the significantly thick and dense magmatic rocks can seal up coal seam gases and prevent escaping of coal seam gases effectively [4].…”

Section: Geofluidsmentioning

confidence: 99%

Analysis of the Coal and Gas Outburst Mechanism from the Perspective of Tectonic Movement

Cheng

Xue

et al. 2021

Geofluids

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Coal and gas outburst is the extreme instability caused by stress, gas, and coal. In this review article, dominant factors and inducing factors of outburst were summarized; geologic features of typical outburst cases and the effects of tectonic movement on outbursts were analyzed; the outburst stages with considerations to geologic factors were divided. It was found that inducing factors, including buried depth, tectonic movement, gas composition, coal seam conditions, overlying/underlying rock conditions, and mining mode, control the outburst by influencing the dominant factors (stress, gas, and coal). Among them, tectonic movement is the key of outburst. Influenced by tectonic movement, the primary structure of coals is damaged/pulverized due to the tectonic stress and unique tectonic mode, resulting in the formation of tectonic coals. When external dynamic factors are changed, tectonic coals are crucial to outburst control for its evolution of porous structure as well as the unique mechanical behaviors and gas flowing responses. Besides, the preparation stage of outburst includes the tectonic process and mining process. The former one refers to the restructuring process of the original coal-bearing strata by tectonic movement, while the mining process is the prerequisite of outburst and it refers to the disturbance of human mining activities to the initial coal seams. It is suggested that more work is required on geological factors of outburst, and a few research areas are proposed for future research.

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“…Magmatic intrusion into coal-bearing strata occurs in many regions worldwide, such as the Colorado (Dutcher et al 1968;Finkelman et al 1998) in the United States, the Huaibei Mining District (Wang et al 2014) in China, the Kyushu region (Sasaki 1959) in Japan, the west coast of Australia (Charles et al 1998), and the Karoo Basin (Aarnes et al 2011) in South Africa. Statistics of coal and gas protrusion accident cases show that the magma intrusion zone is a high incidence area for protrusion accidents (Beamish and Crosdale 1998; Golab and Carr 2004;Sachsenhofer et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of magma intrusion on the thermal evolution of low-rank coal

et al. 2021

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To study the effect of magma intrusion on the thermal evolution of low-rank coal with high water content, the mathematical relationship between water content variation and thermal conductivity of low-rank coal was analyzed by COMSOL Multiphysics numerical simulation and field validation. Taking Daxing Mine in Tiefa coalfield as the research background, the effects of magma finite time intrusion mechanism and water volatilization in coal on thermal evolution and organic maturity of coal seam are investigated in this paper. The results show that as the sill thickness increases, the thermal evolution temperature of the coal seam increases, the required thermal evolution time increases and the final retention temperature increases after the coal seam is cooled down. Approaching the magma, the maximum temperature that the coal seam can reach increases, the maximum temperature lasts longer, and the final temperature retained by the coal seam becomes higher. The increase of water content of coal makes the thermal conductivity increase, and the rate of heat transfer from coal seam is accelerated, and more heat is transferred to distant places in the same time. At the same time, the heat lost by the magma in the same time increases, the time required for the cooling of the magma decreases, and the maximum temperature reached by the underlying coal seam is significantly lower. The presence of moisture weakens the thermal evolution of the magma to the coal seam and reduces the expected maturity of the coal. The results of average random vitrinite reflectance (R o ) and moisture examination of coal samples collected at the Daxing Mine site verified the numerical simulation results of magma thermal evolution.

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Thermal effects of magmatic sills on coal seam metamorphism and gas occurrence

Cited by 27 publications

References 25 publications

Pulverization characteristics of coal from a strong outburst-prone coal seam and their impact on gas desorption and diffusion properties

Pulverization characteristics of coal from a strong outburst-prone coal seam and their impact on gas desorption and diffusion properties

Analysis of the Coal and Gas Outburst Mechanism from the Perspective of Tectonic Movement

Numerical simulation of magma intrusion on the thermal evolution of low-rank coal

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