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Prediction of Critical Desorption Pressure of Coalbed Methane in Multi-coal Seams Reservoir of Medium and High Coal Rank: A Case Study of Eastern Yunnan and Western Guizhou, China

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Abstract

In the process of multiseam combined drainage, the critical desorption pressure (Pcd) is the basic measurement index for determining whether a multigas-bearing system can be combined with drainage, and it is the basic index for identifying effectively the contributions of productive strata. In actual exploration and development processes, the Pcd is constrained by geological factors, engineering factors and economic factors, and the Pcd of some key coal seams cannot be determined effectively, which restricts the efficient development and utilization of coalbed methane. Accurate prediction of the Pcd of multiple coal seams under formation conditions has become a key requirement. In this study, medium-rank and high-rank coal samples were collected from the main synclines in Eastern Yunnan and Western Guizhou. By introducing the fractal dimension using nuclear magnetic resonance and the Pearson–Spearman correlation coefficient, the influences of coal metamorphism, pore structure, coal quality, temperature (T), and others on coal adsorption capacity were revealed. The results showed that, affected by the hydrocarbon generation and evolutionary processes of coal, fractal dimensions of adsorption pore (D3) and seepage pore (D4), the ratio of vitrinite to inertinite (V/I), the Langmuir volume (VL) and Langmuir pressure (PL) showed segmentation as the degree of metamorphism increased significantly. Bounded by random reflectance Rr = 1.30%, before Rr = 1.30%, with increase in metamorphic grade, VL and Rr showed “U” type change due to the change of molecular structure, maceral content, and structure of seepage pore, and then the evolution of hydrocarbon generation was weakened mainly by the influence of coal and rock components, showing linear change. The slopes of PL and Rr were larger before Rr = 1.30% than after Rr = 1.30%. The variation in PL with metamorphic degree was controlled mainly by the seepage capacity of coal rock, followed by the macerals of coal rock. Based on these results, the Levenberg–Marquardt algorithm was used with Rr and T as independent variables, VL and PL as dependent variables, and the R2 as the judgment value. A piecewise equation for calculating adsorption parameters with a high-fitting degree was obtained. Combined with the Langmuir equation, the prediction equation of Pcd can be calculated under the conditions of Rr and T and the measured gas content of known key coal seams. The correlation between the prediction equation and the measured parameters was high, and the identification template of Pcd of medium–high-rank coal in the study area was given. The new calculation method is more convenient for obtaining parameters and can be applied effectively to coal seams without the need to perform isothermal adsorption tests.

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Acknowledgments

Financial support for this work was provided by the National Natural Science Foundation of China (No. 41772155), the National Major Research Program for Science and Technology of China (No. 2016ZX05044002), and Major Science and Technology Special Funding Projects of Shanxi (20201102001).

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Correspondence to Zhaobiao Yang.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Li, C., Yang, Z., Chen, J. et al. Prediction of Critical Desorption Pressure of Coalbed Methane in Multi-coal Seams Reservoir of Medium and High Coal Rank: A Case Study of Eastern Yunnan and Western Guizhou, China. Nat Resour Res 31, 1443–1461 (2022). https://doi.org/10.1007/s11053-022-10034-x

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