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《Geochimica》 2003-06
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Simulation experiments on thermochemical sulfate reduction of methane with solid calcium sulfate

YUE Chang-LI Shu-yuan, DING Kang-le, ZHONG Ning-ning (State Key Lab of Heavy Oil Processing, University of Petroleum, Beijing 102249, China)  
The association of sulfate and hydrocarbon is thermodynamically unstable in deep carbonate diagenetic environment. Hence, the redox reactions occur and hydrocarbons disappear inorganically (thermochemical sulfate reduction; TSR). The work on this field has been the subject of much research in recent years. In this paper, the thermodynamic problem between methane and calcium sulfate is discussed to investigate the possibility of this reaction. It is found that the reaction occurs spontaneously and increasing temperature is favored. Thermal simulation experiments on methane and solid calcium sulfate are carried out using autoclave on the conditions of high temperature and high pressure. The properties of the products of the reaction are analyzed by microcoulometry, gas chromatogram and Fourier transform infrared spectrum (FT IR) methods. According to the results, hydrogen sulfide, calcium carbonate and water are the main products during the reaction. Further research on this subject is necessary in future to understand more details of the TSR system and issue of hydrocarbon destruction in gas reservoirs.
【Fund】: 国家自然科学基金(40172047);; 国家重点基础研究规划项目(G1999043307)
【CateGory Index】: P618.13
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