Geochemical Characteristics of Shale Desorbed Gas in the Shanxi Formation of the Ordos Basin
DOI:
https://doi.org/10.62051/ajmse.v1n2.11Keywords:
Shale Desorbed Gas, Shanxi Formation, Organic Matter Abundance, Ordos BasinAbstract
The Shanxi Formation in the Ordos Basin is an important strata for continental shale gas exploration in China. The study of the geochemical characteristics of its desorbed gas and the main controlling factors of reservoir formation is of great significance for resource potential assessment and development optimization. Based on the core samples from Well Chang96 and Well Yan2156 in the southeastern part of the basin, this paper systematically analyzes the characteristics of desorbed gas from shales in the Shanxi Formation. The research results show that: (1) The shale gas in the Shanxi Formation is mainly high-maturity thermogenic dry gas. The proportion of methane ranges from 80% to 93% (with an average of 80.05% in Member 1 and 84.02% in Member 2). The content of heavy hydrocarbons is extremely low (<0.3%), and the methane coefficient is >0.99. The non-hydrocarbon gases are mainly CO₂ and N₂ (with an average of 14% - 16%), and some are affected by air mixing. (2) The content of desorbed gas is closely related to lithology and organic matter abundance. Carbonaceous mudstone has the highest desorbed gas content, while fine-grained rocks such as mudstone and siltstone have significantly lower desorbed gas content, which is mainly controlled by differences in organic carbon content. (3) The desorbed gas content of shale gas in the Shanxi Formation of the Ordos Basin is low, which restricts resource potential assessment and favorable area prediction. This study provides a scientific basis for the efficient exploration and development of shale gas in the Ordos Basin and contributes to the improvement of the theoretical and technical systems for continental shale gas.
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