Simulation experiments on the reaction system of CH4-MgSO4-H2O |
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Authors: | Ding KangLe Li ShuYuan Yue ChangTao Zhong NingNing |
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Institution: | (1) State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, China;(2) Faculty of Natural Resource and Information Technology, China University of Petroleum, Beijing, 102249, China |
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Abstract: | H2S-rich gas in carbonate reservoirs is usually attributed to thermochemical sulfate reduction (TSR). In this paper, thermal
simulation experiments on the reaction system of CH4-MgSO4-H2O were carried out using autoclave at 425°C–525°C. The threshold temperature for initiating TSR is much lower than our previous
studies (550°C). Properties of the reaction products were analyzed by microcoulometry, gas-chromatography (GC), Fourier transform-infrared
spectrometry (FT-IR) and X-ray diffraction (XRD) methods. Thermodynamics and reaction kinetics of TSR processes were investigated
on the basis of the experimental data. The results show that thermochemical reduction of magnesium sulfate with methane can
proceed spontaneously to produce magnesium oxide, hydrogen sulfur, and carbon dioxide as the main products, and high temperature
is thermodynamically favorable to the reaction. According to the reaction model, the calculated activation energy of TSR is
101.894 kJ/mol, which is lower than that by most previous studies. Mg2+ may have played a role of catalytic action in the process of TSR. The elementary steps of TSR and reaction mechanism were
discussed tentatively. The study can provide important information on the explanation of geochemical depth limit for natural
gas and on the generation of high H2S gas in deep carbonates reservoirs.
Supported by the National Natural Science Foundation of China (Grant Nos. 40472076 and 40702019) and Item of Cooperative Fund
of Beijing Educational Committee (Grant No. XK114140479) |
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Keywords: | H2S thermochemical sulfate reduction (TSR) thermal simulation experiments reaction system of CH4-MgSO4-H2O thermodynamics and kinetics reaction mechanism |
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