Gas content evaluation in deep coal seam with an improved method and its geological controls

Haiqi LI, Shida CHEN, Dazhen TANG, Shuling TANG, Jiaosheng YANG

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PDF(7118 KB)
Front. Earth Sci. ›› 2024, Vol. 18 ›› Issue (3) : 623-636. DOI: 10.1007/s11707-024-1103-4
RESEARCH ARTICLE

Gas content evaluation in deep coal seam with an improved method and its geological controls

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Abstract

An improved evaluation method for estimating gas content during the inversion process of deep-burial coal was established based on the on-site natural desorption curves. The accuracy of the US Bureau of Mines (USBM), Polynomial fitting, Amoco, and the improved evaluation methods in the predicting of lost gas volume in deep seams in the Mabidong Block of the Qinshui Basin were then compared. Furthermore, the calculation errors of these different methods in simulating lost gas content based on coring time were compared. A newly established nonlinear equation was developed to estimate the minimum error value, by controlling the lost time within 16 min, the related errors can be reduced. The improved evaluation was shown to accurately and rapidly predict the gas content in deep seams. The results show that the deep coal bed methane accumulation is influenced by various factors, including geological structure, hydrodynamic conditions, roof lithology, and coalification. Reverse faults and weak groundwater runoff can hinder the escape of methane, and these factors should be considered in the future exploration and development of coalbed methane.

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Keywords

deep coalbed methane / Mabidong Block / lost gas / geological controls

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Haiqi LI, Shida CHEN, Dazhen TANG, Shuling TANG, Jiaosheng YANG. Gas content evaluation in deep coal seam with an improved method and its geological controls. Front. Earth Sci., 2024, 18(3): 623‒636 https://doi.org/10.1007/s11707-024-1103-4

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Acknowledgments

The authors thank the China Petroleum Exploration and Development Research Institute for facilitating the work. This work was supported by the National Natural Science Foundation of China (Grant No. 42130802), and PetroChina Company Limited “14th Five Year Plan” Science and Technology Major Project (No. 2021DJ2301).

Competing interests

The authors declare that they have no competing interests.

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