Geochemical characteristics and identification of thermogenic CBM generated during the low and middle coalification stages

Bao, Yuan; Wei, Chongtao; Wang, Chaoyong; Li, Laicheng; Sun, Yimin

doi:10.2343/geochemj.2.0265

Cited by 16 publications

(23 citation statements)

References 27 publications

(17 reference statements)

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“…Through a pyrolysis experiment, Bao et al 51 established an amendatory relationship between the δ 13 C CH 4 of thermogenic gas and the maximum maturity (R 0,max ) of coal as follows: …”

Section: Proportions Of Gases Of Different Originmentioning

confidence: 99%

Composition, Origin, and Distribution of Coalbed Methane in the Huaibei Coalfield, China

Bao

et al. 2015

Energy Fuels

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This study researched the geochemical origin of coalbed methane (CBM) in three mining areas of the Huaibei coalfield and the distribution of different origin gases. The Rock-Eval data indicate that coal and coaly mudstone in this coalfield are both good gas-source rocks and are within the gas generation window. The large ranges of isotope data (δ 13 C CH 4 = −42.8‰ to −75.5‰; δD CH 4 = −153.2‰ to −228.1‰; δ 13 C CO 2 = +8.2‰ to −24.3‰) reflect the complicated formation mechanism and evolutionary process of CBM. Both thermogenic and biogenic gas are present within the mining areas to varying degrees, with the biogenic gas being predominately generated via the CO 2 reduction pathway. Gas migration was most prevalent in the Suixiao mining area, low in the Linhuan mining area, and not identified in the Suzhou mining area. An appropriate distribution model for the gases of different origin is, from bottom to top, a thermogenic gas zone, a mixture zone, a secondary biogenic gas zone, and a gas-weathered zone. Spatially, secondary biogenic gas was in the basin margins, thermogenic gas in the central part, and the mixed gas in the transitional zone. The CBM prospectivity is greatest in the Suzhou mining area, moderate in the Linhuan mining area, and worst in the Suixiao mining area.

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“…Through a pyrolysis experiment, Bao et al 51 established an amendatory relationship between the δ 13 C CH 4 of thermogenic gas and the maximum maturity (R 0,max ) of coal as follows: …”

Section: Proportions Of Gases Of Different Originmentioning

confidence: 99%

Composition, Origin, and Distribution of Coalbed Methane in the Huaibei Coalfield, China

Bao

et al. 2015

Energy Fuels

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“…Coals with different ranks have different growth characteristics of pores due to the lithostatic pressure, tectonism, and degree of metamorphism (Gan et al, 1972;Hakimi et al, 2013;Wang et al, 2009;Zhou et al, 2015). During the early stages of coalification (usually corresponding to the mean maximum reflectance values of vitrinite R o,max <0.65 %), the aromatic layer of coal is small and nearly randomly distributed (Bao et al, 2013;Hirsch, 1954;Xia et al, 2013;Zhou et al, 2015). Pores in such coals are developed in each scale of pore width with large pore volume and internal surface area (Bao et al, 2013;Xia et al, 2013;Zhou et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…During the early stages of coalification (usually corresponding to the mean maximum reflectance values of vitrinite R o,max <0.65 %), the aromatic layer of coal is small and nearly randomly distributed (Bao et al, 2013;Hirsch, 1954;Xia et al, 2013;Zhou et al, 2015). Pores in such coals are developed in each scale of pore width with large pore volume and internal surface area (Bao et al, 2013;Xia et al, 2013;Zhou et al, 2015). During the high-volatile bituminous coal and medium-volatile bituminous coal stages (R o,max =0.65-1.2 %), with the increase in coal rank and under the mechanical compaction and dehydration effects, pore volume reduces, especially macropores and mesopores (Bao et al, 2013;Liu et al, 2013;Xia et al, 2013;Zhou et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Pores in such coals are developed in each scale of pore width with large pore volume and internal surface area (Bao et al, 2013;Xia et al, 2013;Zhou et al, 2015). During the high-volatile bituminous coal and medium-volatile bituminous coal stages (R o,max =0.65-1.2 %), with the increase in coal rank and under the mechanical compaction and dehydration effects, pore volume reduces, especially macropores and mesopores (Bao et al, 2013;Liu et al, 2013;Xia et al, 2013;Zhou et al, 2015). At the low-volatile bituminous coal stage (R o,max =1.3-1.7%), humic gelation completes dehydration and compaction, and the micropore content furtherdeclines.…”

Section: Introductionmentioning

confidence: 99%

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FIB-SEM and X-ray CT characterization of interconnected pores in high-rank coal formed from regional metamorphism

Liu¹,

Sang

Wang

et al. 2017

Journal of Petroleum Science and Engineering

129

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Pores in coal and their connectivity are important properties of coal, providing network or channels for gas storage and migration within coal, e.g. during the coalbed methane (CBM) recovery. To investigate the growth characteristics and genetic types of pores in coal in terms of macropore and mesopore, the pores of a high-rank coal were measured by various techniques such as the mercury intrusion method, nitrogen adsorption, focused ion beam scanning electron microscopy (FIB-SEM), and X-ray micro-CT (Computed Tomography). Two high-rank coals formed from regional metamorphism collected from the southern Qinshui basin were selected. The FIB-SEM and X-ray micro-CT provides detailed experimental information for development of a three dimensional (3D) pore network model, which was further used to characterize the pore connectivity. Volume percent of pores of these high-rank coals are dominated by mesopores of approximately 10-50 nm in width, and then followed by micropores, along with the smallest volume percent of macropores. The connectivity within this high-rank coal was mesopore-dominated pore network. Electron microscopy observations further revealed there are coalification-related pores and mineral-related pores in the high-rank coal. The coalification-related pores can be classified as secondary gas pores in organic matter and shrinkage-induced pores around quartz and clay minerals; and the mineral-related pores are developed within minerals, and can be classified as dissolution-created pores and intercrystalline pores. The secondary gas pores are macropores and have poor connectivity. The mineral-related pores can be both macropores and mesopores, and have little influence on pore connectivity due to small content of carbonate minerals in these samples. Under electron microscopy, the shrinkage-induced pores are mainly mesopores. The regional metamorphism, with a high abnormal old thermal field in the research area, is the precondition of the formation of the shrinkage-induced pores. The quartz and clay minerals in the coal provide different formation conditions and hence form different shapes of the shrinkage-induced pores. The coal samples include a large number of shrinkage-induced pores that act as the interconnected pores in the coal and exhibit good connectivity. The quartz and clay minerals play a significant role in developing the interconnected pores in the high-rank coal formed from regional metamorphism.

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“…Due to ongoing high pressure and temperature-associated compaction processes from the deposition of overlaying strata, the coal was naturally buried to varying depths depending on the extent of forces experienced by the associated geology [8,16,18]. This coal formation process is known as coalification [4,19]. Depending on the geological history, the coal is classified into different ranks which are defined as the extent or level of coal maturation [8,20,21].…”

Section: Csg Extractionmentioning

confidence: 99%

Economic Synergies from Tighter Agri-Business and Coal Seam Gas Integration

Mehreen¹,

Underschultz²

2018

Agricultural Value Chain

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In addition to government royalties, Australia's coal seam gas (CSG) development has been beneficial in terms of facilitating regional economic development and growth, expansion of remote populations and facilities, increased employment opportunities and improved regional infrastructure, mainly in regional Queensland. There is substantial revenue potential for the Australian economy from the export of the resource to international energy markets. Many current CSG operations in Australia are located in prime agricultural-cattle grazing regions. Failure to identify potential coexistence opportunities between agribusiness promoting industries (API's) and the CSG industry could limit the agriculture value chain and consequently restrict Australia's food security and agricultural export potential. The economic benefits of the CSG industry combined with the importance of a sustained agricultural industry lay the foundation for investigating coexistence opportunities between these industries. Emphasis has been placed on potential synergies exhibited by the CSG industry (namely from CSG by-products) and the local agricultural industry which is typically dominated by API's.

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Geochemical characteristics and identification of thermogenic CBM generated during the low and middle coalification stages

Cited by 16 publications

References 27 publications

Composition, Origin, and Distribution of Coalbed Methane in the Huaibei Coalfield, China

Composition, Origin, and Distribution of Coalbed Methane in the Huaibei Coalfield, China

FIB-SEM and X-ray CT characterization of interconnected pores in high-rank coal formed from regional metamorphism

Economic Synergies from Tighter Agri-Business and Coal Seam Gas Integration

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