The Formation of Ferric Sulfide in the TSR System for the Carbonate Rock

YUE Chang tao; LI Shu yuan; DING Kang le; ZHONG Ning ning

Organic -inorganic reactions in the process TSR (Thermochemical Sulfate Reduction) are the main reasons to re - sult in hydrocarbon disappearance. Metal sulfide formation is very important in geochemical cycle of C -S -O system. In this paper, thermal simulation experiments were carried out using autoclave at definite temperature and pressure. The properties of the products were characterized by X -ray diffraction method to investigate the reaction pathway. The thermodynamics and kinetics of H ₂ S -Fe ₂ O ₃ systemswere discussed. It is found that H ₂ S -Fe ₂ O ₃ reaction can proceed spontaneously and increasing temperature is disfavored for H ₂ S -Fe ₂ O ₃ system. The products of H ₂ S -Fe ₂ O ₃ systems were complex Fe -S materials and the primary compound is FeS ₂ . On the basis of the experimental data, the reaction mechanism was discussed tentatively. The study on the formation of ferric sulfide in the TSR system for the carbonate rock is a novel way to explain the organic -inor - ganic reactions in deep environment. Further research on this subject is necessary in the future to understand more details of the TSR system and issue of hydrocarbon destruction in gas reservoirs.

The Formation of Ferric Sulfide in the TSR System for the Carbonate Rock

State Key Lab of Heavy Oil Processing, School of Chemical Engineering, University of Petroleum, Beijing 102249

Received Date: 2003-10-24

Rev Recd Date: 2004-02-13

Publish Date: 2004-12-10

Key words:

Abstract: Organic -inorganic reactions in the process TSR (Thermochemical Sulfate Reduction) are the main reasons to re - sult in hydrocarbon disappearance. Metal sulfide formation is very important in geochemical cycle of C -S -O system. In this paper, thermal simulation experiments were carried out using autoclave at definite temperature and pressure. The properties of the products were characterized by X -ray diffraction method to investigate the reaction pathway. The thermodynamics and kinetics of H ₂ S -Fe ₂ O ₃ systemswere discussed. It is found that H ₂ S -Fe ₂ O ₃ reaction can proceed spontaneously and increasing temperature is disfavored for H ₂ S -Fe ₂ O ₃ system. The products of H ₂ S -Fe ₂ O ₃ systems were complex Fe -S materials and the primary compound is FeS ₂ . On the basis of the experimental data, the reaction mechanism was discussed tentatively. The study on the formation of ferric sulfide in the TSR system for the carbonate rock is a novel way to explain the organic -inor - ganic reactions in deep environment. Further research on this subject is necessary in the future to understand more details of the TSR system and issue of hydrocarbon destruction in gas reservoirs.

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Reference (14)

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The Formation of Ferric Sulfide in the TSR System for the Carbonate Rock

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