Simulation Study on the Effect of Gypsum-salt Content on Hydrocarbon Generation in Mature Stage Shale

doi:10.3969/j.issn.1006-6535.2022.05.016

Abstract

Abstract: Gypsum-salt rock layers of different thicknesses are developed in the source rock strata of marine and continental basins in China. In order to investigate the influence of the variation of paste rock content on the hydrocarbon generation process and product characteristics of source rocks, taking the shale of Eagle Ford Formation in Permian Basin of the United States as source rock, hydrocarbon generation simulations were made by adding natural gypsum-salt rocks with different mass fractions to analyze the characteristics of the liquid products retained in the solid reactants. The results showed that: with the increase of the mass fraction of gypsum-salt rock, the retained hydrocarbon yield of the marine source rock presented a U-shaped curve of “decreasing then increasing”, and the content of gypsum-salt rock had a linear relationship with the relative content of saturated hydrocarbons, indicating that the gypsum-salt rock could significantly improve the quality of crude oil; the content of gypsum-salt rock was positively correlated with the parameter values of Pr/Ph, U/R and other biomarker compounds, and the influence of gypsum-salt rock content should be fully considered in the application of parameters. The results of the study are important reference for the accurate evaluation of shale oil reserve potential and the identification of the main controlling factors of shale oil quality variation.

Key words: gypsum-salt rock, residual hydrocarbon, hydrocarbon generation, shale, Eagle Ford Formation

CLC Number:

TE122.2

Meng Qingqiang, Li Jingzhou, Liu Wenhui, Fu Qi, Wang Xiaofeng, Wang Jie. Simulation Study on the Effect of Gypsum-salt Content on Hydrocarbon Generation in Mature Stage Shale[J]. Special Oil & Gas Reservoirs, 2022, 29(5): 113-118.

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