• 责任者：He Kun (State Key Laboratory of Enhanced Oil Recovery ; Research Institute of Petroleum Exploration and Development ; PetroChina ; Beijing 100083 ; China) ; Zhang Shuichang
• 刊名：Acta Petrolei Sinica
• 出版年：2013
• 卷期：34(4)
• 关键词：原油 ; crude oil ; 裂解气 ; cracked gas
• 页码：p.720-726
• 图表：illus., 37 refs.
• 分类号：1003
• issnNo：ISSN0253-2697
• isbnNo：CN11-2128/TE

     Thermochemical sulfate reduction （TSR） might alter the stability of oils and the yield of cracked gas in reservoirs because its reaction pathway or mechanism differs from that of oil cracking. In order to ascertain the effect of TSR on the generation of cracked gas from oils, we performed a series of non-isothermal pyrolysis experiments involving different sulfates and an oil （QB3） with a gold-tube system. The generation of considerable amounts of non-hydrocarbon gases （including H2 S） indicates that TSR is in- itiated by the presence of gypsum and magnesium sulfate （MgSO4）. Comparatively, the yield and generation activation energy of gaseous hydrocarbons are not obviously affected by TSR involving gypsum. Whereas TSR involving MgSOg leads to about 13.1% decrease in the methane yield and also a remarkable decrease in the stability of C2＋ , and the addition of MgC12 to the MgSO4 system results in a further increase in the H2S yield but a further decrease in the hydrocarbon gas yield. Moreover, the redox reaction be- tween C2＋ and actively structured HNO4 - can take place in the MgSO4 pyroysis system, which is attributed to an important cause for decreasing the yield of gaseous hydrocarbons. Therefore, the effect of TSR on the generation of cracked gas is significantly domina- ted by sulfate types and the concentration of active species in formation water.