Abstract
Isotope geochemical experiments were conducted on coalbed methane (CBM) from the Zhengzhuang (ZZ) block to understand its formation history and aggregation pattern in the southern Qingshui Basin. The study analyzed the correlation between methane carbon isotope (δ13C1) and factors such as burial depth, gas content, tectonics, and hydrodynamic conditions in 3# coal seam of the Shanxi Formation and 15# coal seam of the Taiyuan Formation. The findings reveal that the δ13C1 values of CBM in 15# coal seam (average −29.4‰), which is at a greater depth, are slightly higher than those in 3# coal seam (average −30.0‰). Positive correlations were observed between δ13C1, gas content, and burial depth. Variations in tectonic and hydrodynamic conditions between 3# and 15# seams account for differences in the spatial distribution of δ13C1 values. Geochemical data, including drainage water analysis, suggest the presence of a potential hidden structure in the northwestern region. Since the Cenozoic Era, gas reservoirs in the area have undergone restructuring, with δ13C1 influenced mainly by desorption, diffusion, transport, and water-solvation effects. The study's results provide valuable insights for applying CBM δ13C1 data in exploration and production.
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