Published

2019-10-01

Coal Seam Roof: Lithology and Influence on the Enrichment of Coalbed Methane

Cimas con gas de filones de carbón: litología e influencia en el enriquecimiento de metano en capas de carbón

DOI:

https://doi.org/10.15446/esrj.v23n4.84394

Keywords:

Low frequency, Rock petrophysics, Lithology, Coalbed methane, Enrichment (en)
baja frecuencia, petrofísica de roca, litología, carbón metano, enriquecimiento (es)

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Authors

  • Yunlan He State Key Laboratory of Coal Resources and Safety Mining, China University of Mining & Technology, Beijing 100083, China
  • Xikai Wang College of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China
  • Hongjie Sun College of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China
  • Zhenguo Xing College of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China
  • Shan Chong State Key Laboratory of Coal Resources and Safety Mining, China University of Mining & Technology, Beijing 100083, China
  • Dongjing Xu Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, College of Earth Science & Engineering, Shandong University of Science and Technology, Qingdao 266590, China
  • Feisheng Feng College of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China

To identify the lithology of coal seam roof and explore the influence of these roofs on the enrichment of coalbed methane, low-frequency rock petrophysics experiments, seismic analyses and gas-bearing trend analyses were performed. The results show that the sound wave propagation speed in rock at seismic frequencies was lower than that at ultrasound frequencies. Additionally, the P-wave velocities of gritstone, fine sandstone, argillaceous siltstone and mudstone were 1,651 m/s, 2,840 m/s, 3,191 m/s and 4,214 m/s, respectively. The surface properties of the coal seam roofs were extracted through 3D seismic wave impedance inversion. The theoretical P-wave impedance was calculated after the tested P-wave velocity was determined. By matching the theoretical P-wave impedance of the four types of rocks with that of the coal seam roofs, we identified the lithology of the roofs. By analyzing known borehole data, we found that the identified lithology was consistent with that revealed by the data. By comparing and analyzing the coal seam roof lithology and the gas-bearing trends in the study area, we discovered that the coal seam roof lithology was related to the enrichment of coalbed methane. In the study area, areas with high gas contents mainly coincided with roof zones composed of mudstone and argillaceous siltstone, and those with low gas contents were mainly associated with fine sandstone roof areas. Thus, highly compact areas of coal seam roof are favorable for the formation and preservation of coalbed methane. 

Para identificar la litología de una cima con gas de filones de carbón y explorar la influencia de estas cimas en el enriquecimiento de metano en capas de carbón, se realizaron experimentos de petrofísica en rocas de baja frecuencia, análisis sísmicos y análisis de tendencias con gas. Los resultados muestran que la velocidad de propagación de la onda de sonido en roca a frecuencias sísmicas fue menor que la de las frecuencias de ultrasonido. Además, las velocidades de la onda P de arenisca, arenisca fina, limolita arcillosa y lutita fueron 1.651 m/s, 2.840 m/s, 3.191 m/s y 4.214 m/s, respectivamente. Las propiedades de la superficie de los techos con gas de filones de carbón se extrajeron mediante inversión de impedancia de onda sísmica 3D. La impedancia teórica de la onda P se calculó después de determinar la velocidad de la onda P probada. Al hacer coincidir la impedancia teórica de la onda P de los cuatro tipos de rocas con la de las cimas con gas de filones de carbón, se identificó la litología de las cimas. Al analizar los datos conocidos del pozo, se encontró que la litología identificada era consistente con la revelada por los datos. Al comparar y analizar la litología de la cima con gas de filones de carbón y las tendencias con gas en el área de estudio, descubrimos que la litología de esta cima estaba relacionada con el enriquecimiento del metano de las capas de carbón. En el área de estudio, las áreas con alto contenido de gas coincidieron principalmente con zonas de techo compuestas de lutita y limolita arcillosa, y aquellas con bajo contenido de gas se asociaron principalmente con áreas de techo de arenisca fina. Por lo tanto, las áreas altamente compactas del techo con vetas de carbón son favorables para la formación y preservación del metano de las capas de carbón.

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How to Cite

APA

He, Y., Wang, X., Sun, H., Xing, Z., Chong, S., Xu, D. and Feng, F. (2019). Coal Seam Roof: Lithology and Influence on the Enrichment of Coalbed Methane. Earth Sciences Research Journal, 23(4), 359–364. https://doi.org/10.15446/esrj.v23n4.84394

ACM

[1]
He, Y., Wang, X., Sun, H., Xing, Z., Chong, S., Xu, D. and Feng, F. 2019. Coal Seam Roof: Lithology and Influence on the Enrichment of Coalbed Methane. Earth Sciences Research Journal. 23, 4 (Oct. 2019), 359–364. DOI:https://doi.org/10.15446/esrj.v23n4.84394.

ACS

(1)
He, Y.; Wang, X.; Sun, H.; Xing, Z.; Chong, S.; Xu, D.; Feng, F. Coal Seam Roof: Lithology and Influence on the Enrichment of Coalbed Methane. Earth sci. res. j. 2019, 23, 359-364.

ABNT

HE, Y.; WANG, X.; SUN, H.; XING, Z.; CHONG, S.; XU, D.; FENG, F. Coal Seam Roof: Lithology and Influence on the Enrichment of Coalbed Methane. Earth Sciences Research Journal, [S. l.], v. 23, n. 4, p. 359–364, 2019. DOI: 10.15446/esrj.v23n4.84394. Disponível em: https://revistas.unal.edu.co/index.php/esrj/article/view/84394. Acesso em: 14 jul. 2024.

Chicago

He, Yunlan, Xikai Wang, Hongjie Sun, Zhenguo Xing, Shan Chong, Dongjing Xu, and Feisheng Feng. 2019. “Coal Seam Roof: Lithology and Influence on the Enrichment of Coalbed Methane”. Earth Sciences Research Journal 23 (4):359-64. https://doi.org/10.15446/esrj.v23n4.84394.

Harvard

He, Y., Wang, X., Sun, H., Xing, Z., Chong, S., Xu, D. and Feng, F. (2019) “Coal Seam Roof: Lithology and Influence on the Enrichment of Coalbed Methane”, Earth Sciences Research Journal, 23(4), pp. 359–364. doi: 10.15446/esrj.v23n4.84394.

IEEE

[1]
Y. He, “Coal Seam Roof: Lithology and Influence on the Enrichment of Coalbed Methane”, Earth sci. res. j., vol. 23, no. 4, pp. 359–364, Oct. 2019.

MLA

He, Y., X. Wang, H. Sun, Z. Xing, S. Chong, D. Xu, and F. Feng. “Coal Seam Roof: Lithology and Influence on the Enrichment of Coalbed Methane”. Earth Sciences Research Journal, vol. 23, no. 4, Oct. 2019, pp. 359-64, doi:10.15446/esrj.v23n4.84394.

Turabian

He, Yunlan, Xikai Wang, Hongjie Sun, Zhenguo Xing, Shan Chong, Dongjing Xu, and Feisheng Feng. “Coal Seam Roof: Lithology and Influence on the Enrichment of Coalbed Methane”. Earth Sciences Research Journal 23, no. 4 (October 1, 2019): 359–364. Accessed July 14, 2024. https://revistas.unal.edu.co/index.php/esrj/article/view/84394.

Vancouver

1.
He Y, Wang X, Sun H, Xing Z, Chong S, Xu D, Feng F. Coal Seam Roof: Lithology and Influence on the Enrichment of Coalbed Methane. Earth sci. res. j. [Internet]. 2019 Oct. 1 [cited 2024 Jul. 14];23(4):359-64. Available from: https://revistas.unal.edu.co/index.php/esrj/article/view/84394

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1. Kun Xiao, Zhongyi Duan, Yaxin Yang, Hongxing Li, Zhen Qin, Qibin Luo. (2022). Experimental study of relationship among acoustic wave, resistivity and fluid saturation in coalbed methane reservoir. Acta Geophysica, 71(3), p.1241. https://doi.org/10.1007/s11600-022-00983-5.

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