Mechanism of methane flow through sheared coals and its role on methane recovery☆

Li, Huoyin; Ogawa, Yujiro; Shimada, Sohei

doi:10.1016/s0016-2361(03)00020-6

Cited by 106 publications

(67 citation statements)

References 10 publications

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“…Combating gasogeodynamic hazard in copper mining can include identifying those areas of the rock mass that have different structural properties as well as finding socalled gas pockets (Li et al 2003;Jiang et al 2011;Wierzbicki and Młynarczuk 2013). The joint application of optical, porosimetric and densitometric analyses presented in this paper, allowed to obtain a complete view of the porous structure of the rocks comprising micro-, meso-and macropores.…”

Section: Discussionmentioning

confidence: 97%

“…Moreover, Zechstein Main Dolomite formations located to the north, on the area of the Polish Lowland, are host and reservoir rocks for hydrocarbons deposits (Czekański et al 2010). Based on the studies of the rocks from Polish mine workings (Pajdak and Kudasik 2016;Godyń 2016), and by the IUPAC standards (Rouquérol et al 1994), typical dolomites have mainly macropores with diameter size D [ 0.050 lm and mesopores (0.002 lm B D B 0.050 lm) (Li et al 2003).…”

Section: Geological Settingmentioning

confidence: 99%

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The use of selected research methods to describe the pore space of dolomite from copper ore mine, Poland

et al. 2017

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Basic knowledge of the characteristics of copper-bearing rock such as dolomite is essential to locate those areas of the deposit which have different structural and textural properties. Those regions can be important in terms of the assessment of the possibilities of gas accumulating in them as well as in terms of gasogeodynamic hazard. To better understand those threats, it is necessary to locate, monitor and analyse those areas in detail. This article characterises the structural and textural parameters of dolomite from the Polkowice-Sieroszowice copper mine in Poland. The study involved five samples from various areas of the mine. A number of research methods were selected. Reflected and transmitted light microscopy (MS), computer microtomography (Micro-CT), gas adsorption porosimetry (LPNA), mercury porosimetry (MIP), helium and quasi-fluid pycnometry (Pycno. He, DryFlo). Each of the methods examined a different scope of the pore size, which enabled to achieve a full view of the porous nature of those rocks. We determined their porosity (open, closed, total), surface area as well as mean size and volume of the pores. Also, we studied the character and the pore size distribution from a few nm to a few mm. Comprehensive dolomite properties analyses showed that these rocks are characterised by high structural variability. They have mesopores and macropores but few micropores. The analyses presented in this paper are determined by a large petrographic diversity of the deposits containing dolomite. This article is an example of a comprehensive approach to the rock analysis in copper ore mines.

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Section: Discussionmentioning

confidence: 97%

Section: Geological Settingmentioning

confidence: 99%

The use of selected research methods to describe the pore space of dolomite from copper ore mine, Poland

et al. 2017

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“…Information on the properties of sheared coals can be found in Beamish and Crosdale (1998) and Cao et al (2000). An important parameter influencing the start of an outburst is coal permeability (Li et al, 2003;Zhang, 1995). The third aspect in which permeability plays an important role is CO 2 sequestration in the coal seam.…”

Section: Inroductionmentioning

confidence: 99%

Permeability Changes of Coal Cores and Briquettes under Tri-Axial Stress Conditions

Wierzbicki¹,

Konečný²,

Kožušníková³

2014

Archives of Mining Sciences

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The paper is dealing with the permeability of coal in triaxial state of stress. The permeability of coal, besides coal's methane capacity, is the main parameter determining the quantity of methane inflow into underground excavations. The stress in a coal seam is one of the most important factors influencing coal permeability therefore the permeability measurements were performed in tri-axial state of stress. The hydrostatic three-axial state of stress was gradually increased from 5 MPa with steps of 5 MPa up to a maximum of 30 MPa. Nitrogen was applied as a gas medium in all experiments.The results of the permeability measurements of coal cores from the "Zofiówka" mine, Poland, and three mines from the Czech Republic are presented in this paper. As a "reference", permeability measurements were also taken for coal briquettes prepared from coal dust with defined porosity.It was confirmed that the decreasing porosity of coal briquettes affects the decreasing permeability. The advantage of experimentation on coal briquettes is its good repeatability.From the experimental results, an empirical relation between gas permeability and confining pressure has also been identified. The empirical relation for coal briquettes is in good correspondence with published results. However, for coal cores, the character of change differs. The influence of confining pressure has a different character and the decrease in permeability is stronger due to the increasing confining pressure.

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“…A rock and gas outburst is defined as a process of rock crushing and a dynamic movement of the rock and gas mixture into the excavation area (Lama and Bodziony [9], Beamish and Crosdale [2], Cao et al [5]). According to the majority of theories and scientific research, a rock and gas outburst is triggered mainly by the energy of gases released from a rock mass and a necessary condition for it to occur is the presence of gas pockets in a rock mass (Li et al [10], Jiang et al [7]). Additional factors that contribute to the occurrence of an outburst are among others different structural properties of a rock mass in its restricted areas, changes of tensions of a rock mass due to its exploitation as well as a working face approaching faults (Shepherd et al [15], Xue et al [18], Lianchong et al [11], Wierzbicki and Młynarczuk [17]).…”

Section: Introductionmentioning

confidence: 99%

Structural and Textural Characteristics of Selected Copper-Bearing Rocks as One of the Elements Aiding in the Assessment of Gasogeodynamic Hazard

Pajdak

Kudasik

2017

Studia Geotechnica Et Mechanica

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Abstract:The characteristics of copper-bearing rocks that include the structural and textural parameters are an important factor determining a possible gas accumulation in those rocks. In September 2009, in the Rudna copper mine in Poland, an outburst of gases and dolomite occurred. The analysis of the outburst mass showed that one of the main causes of the outburst was the different structural properties such as high porosity and presence of gas in the pores. This paper presents data from the structural analysis of dolomite from the Polkowice-Sieroszowice copper mine and the Rudna copper mine. Seven rock samples from various areas of the mines were tested by the following methods: mercury porosimetry (MIP), low pressure gas adsorption (LPNA), scanning electron microscopy (SEM), computed microtomography (micro-CT). The SEM analyses of the rock samples allowed pores of various sizes and shapes to the observed. The porosity (MIP) of the dolomite changed in the range of 3-15%. The total micro and mesopore volume (LPNA) was from 0.002 cm 3 /g to 0.005 cm 3 /g. The macropore volume (MIP) was from 0.01 cm 3 /g to 0.06 cm 3 /g and the mean macropore diameter was from 0.09 µm to 0.18 µm. The dolomite samples varied in the surface area (LPNA) (0.7-1.5 m 2 /g) and the pore distribution. The structure of dolomite determines the possibility of the occurrence of gasogeodynamic phenomena and hence it is urgent that research be conducted into its changeability. To better understand the gasogeodynamic processes in copper-bearing rocks, it is necessary to constantly monitor and analyse in detail those areas that have different structural properties.

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Mechanism of methane flow through sheared coals and its role on methane recovery☆

Cited by 106 publications

References 10 publications

The use of selected research methods to describe the pore space of dolomite from copper ore mine, Poland

The use of selected research methods to describe the pore space of dolomite from copper ore mine, Poland

Permeability Changes of Coal Cores and Briquettes under Tri-Axial Stress Conditions

Structural and Textural Characteristics of Selected Copper-Bearing Rocks as One of the Elements Aiding in the Assessment of Gasogeodynamic Hazard

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