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Journal Article
Journal: AAPG Bulletin
Published: 01 October 2023
AAPG Bulletin (2023) 107 (10): 1781–1797.
...Lei Han; Jian Shen; Jing Qu; Changjiang Ji; Huijie Cheng Abstract The micro-occurrence state and the mobility of irreducible water in coal is important in achieving high coalbed methane (CBM) production. Displacement system and computed tomography experiments were conducted using high-rank coals...
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Journal Article
Journal: AAPG Bulletin
Published: 01 February 2023
AAPG Bulletin (2023) 107 (2): 213–241.
...Haihai Hou; Longyi Shao; Yue Tang; Zhen Li; Sheng Zhao; Minglei Yao; Xuetian Wang; Jiaqiang Zhang ABSTRACT This study aimed to quantitatively characterize pore structure of middle- and high-ranked coal reservoirs in northern China. A total of 51 coal samples from the three coalbed methane (CBM...
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Journal Article
Journal: Geophysics
Published: 18 November 2019
Geophysics (2020) 85 (1): S1–S10.
... possess sparse characteristics, and the diffractions adhering to Huygens’ principle behave as low-rank components. Therefore, we have developed a 3D low-rank diffraction imaging method that uses the Mahalanobis-based low-rank and sparse matrix decomposition method for separating and imaging 3D...
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Journal Article
Journal: AAPG Bulletin
Published: 15 July 2019
AAPG Bulletin (2019) 103 (7): 1653–1690.
... and, being rich in coal and coalbed methane (CBM) resources, has become one of the key research basins for China’s low-rank CBM exploration and development ( Sun et al., 2008 ). The total CBM resources with a burial depth of less than 2000 m (<6600 ft) in China is approximately 36.8 trillion m 3 (∼396.1...
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Journal Article
Journal: AAPG Bulletin
Published: 15 June 2019
AAPG Bulletin (2019) 103 (6): 1297–1319.
...Junpeng Zou; Weizhong Chen; Diansen Yang; Jingqiang Yuan; Yu-Yong Jiao ABSTRACT Low-rank coal reserves account for nearly 55% of the national coal reserves in China, and it is extremely important to understand their anisotropic microstructure and coalbed methane storage and sorption characteristics...
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Series: GSA Special Papers
Published: 14 June 2019
DOI: 10.1130/2018.2541(10)
EISBN: 9780813795416
.... These maturity variations along regional fault zones are connected with varying deformation intensity and explained by unequal conductive heat flow. In the Kap Washington Group, the high coal rank attaining 5.4% R r is associated with ductile deformation, and is additionally influenced by magmatic activity, i.e...
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Journal Article
Journal: AAPG Bulletin
Published: 15 January 2019
AAPG Bulletin (2019) 103 (1): 189–213.
..., and areas with C 1 /C 2+ ratio ranging from 58 to 1000 are mainly present in the deep area (i.e., 801–1396 m [2628–4580 ft]) ( Table 2 ). In contrast to some typical low- to medium-rank coal basins around the world, the CH 4 composition in the southern Junggar Basin is significantly lower than...
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Journal Article
Journal: Interpretation
Published: 09 March 2018
Interpretation (2018) 6 (2): T271–T281.
... in situ stress field of a coal reservoir with a high coal rank. The results indicated that the horizontal stress field within the coal reservoir is controlled by the burial depth, folding, and faulting. The σ H and σ h values within the coal reservoir are 1–2.5 MPa higher than those within the clastic...
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Journal Article
Published: 01 March 2018
Russ. Geol. Geophys. (2018) 59 (3): 299–312.
... bed Ordos Basin Permeability of the coal reservoir greatly affects the productivity and commercial exploitation of coalbed methane (CBM). Influencing factors of permeability, i.e. coal rank, macerals, burial depth, coal texture, in-situ stress, fracture (joint and cleat) and etc., have been...
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Journal Article
Journal: AAPG Bulletin
Published: 01 January 2018
AAPG Bulletin (2018) 102 (1): 153–174.
...Chenghua Ou; Chaochun Li; Dongming Zhi; Lie Xue; Shuguang Yang ABSTRACT To reveal the resource potential of low-rank coalbed methane (LRCBM) and determine the favorable area from six different zones in the southern Junggar Basin in China, a new LRCBM assessment methodology was developed...
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Journal Article
Journal: Palynology
Published: 22 December 2017
Palynology (2017) 41 (0): 221–246.
... ), which is indicative of a high volatile carbon (C) bituminous rank assignment (Stach et al. 1982 ). The stratigraphically lower Vancleve coal bed, which is in close proximity to the overlying Betsie Shale Member, was found to have average dry, ash-free volatile matter contents of 46.2% (Eble & Greb...
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Journal Article
Published: 22 April 2016
Geological Magazine (2017) 154 (3): 591–608.
...-sedimentary complexes attained high maturation levels, equivalent to anthracite coal rank (3.0–3.5% R oran ), which pre-dates the middle Moscovian Santa Susana Basin. The Santa Susana Basin attained moderate maturation levels equivalent to bituminous coal rank (1.35–1.5% R oran ) recording a second episode...
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Journal Article
Journal: AAPG Bulletin
Published: 01 November 2015
AAPG Bulletin (2015) 99 (11): 2099–2119.
...Changan Shan; Tingshan Zhang; Junjie Guo; Zhao Zhang; Yang Yang ABSTRACT To gain a better understanding of the characteristics of micropore systems in high-rank coal reservoirs, 51 coal core samples collected from 16 wells were examined by maceral analysis, proximate analysis, scanning electron...
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Journal Article
Journal: AAPG Bulletin
Published: 01 October 2015
AAPG Bulletin (2015) 99 (10): 1803–1825.
...Jorge Mariño; Stephen Marshak; Maria Mastalerz ABSTRACT Coal rank reflects the temperature of coalification, with higher rank coal forming at higher temperatures. If the temperature of coalification depended only on the Earth’s geothermal gradient, then the maximum rank of coal in a sedimentary...
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Journal Article
Journal: AAPG Bulletin
Published: 01 December 2014
AAPG Bulletin (2014) 98 (12): 2581–2610.
...M. D. Lewan; M. J. Kotarba ABSTRACT Hydrous-pyrolysis experiments at 360°C (680°F) for 72 h were conducted on 53 humic coals representing ranks from lignite through anthracite to determine the upper maturity limit for hydrocarbon-gas generation from their kerogen and associated bitumen (i.e...
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Journal Article
Journal: AAPG Bulletin
Published: 01 February 2014
AAPG Bulletin (2014) 98 (2): 395–420.
...Yves Gensterblum; Alexej Merkel; Andreas Busch; Bernhard M. Krooss; Ralf Littke Abstract The influence of moisture, temperature, coal rank, and differential enthalpy on the methane (CH 4 ) and carbon dioxide (CO 2 ) sorption capacity of coals of different rank has been investigated by using high...
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Journal Article
Journal: AAPG Bulletin
Published: 01 August 2013
AAPG Bulletin (2013) 97 (8): 1371–1393.
... determine the heterogeneous distribution of gas in the Weibei coalbed methane (CBM) field. The coal rank of the Pennsylvanian no. 5 coal seam is mainly low-volatile bituminous and semianthracite. The total gas content is 2.69 to 16.15 m 3 /t (95.00–570.33 scf/t), and gas saturation is 26.0% to 93.2%. Burial...
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Journal Article
Published: 03 June 2010
Geological Magazine (2011) 148 (1): 35–49.
.... Several methods may be used for this purpose, such as the conodont colour alteration index (CAI), microscopic analysis of the textural modifications of these microfossils, the illite Kübler index (KI), X-ray diffraction analyses of clay mineralogy, vitrinite reflectance (Rr%), coal rank, palynomorph...
Journal Article
Journal: AAPG Bulletin
Published: 01 August 2008
AAPG Bulletin (2008) 92 (8): 1077–1106.
... the mapping of coal-rank and coalbed gas potential. Quantities of methane generated at approximately 1.2% R o are about 300 standard cubic feet per ton (scf/ton) and more than 2500 scf/ton (in-situ dry-ash-free coal) at R o values reaching 1.9%. Gases generated in both low- and high-maturity coals are less...
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Journal Article
Journal: AAPG Bulletin
Published: 01 January 2008
AAPG Bulletin (2008) 92 (1): 77–86.
...Amanda M. M. Bustin; R. Marc Bustin Abstract Methane adsorption isotherms measured for a series of coals with varying rank at a wide range of temperatures and pressures allows the prediction of the change in sorption capacity as a function of tectonic history. Changes in sorption capacity...
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