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《Oil & Gas Geology》 2010-03
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Influences of sulfur on composition of oil cracked gas and carbon isotopes

Yin Qin~(1,2),Song Zhiguang~1 and Liu Jinzhong~1 (1.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,Guangdong 510640,China; 2.Graduate School,Chinese Academy of Sciences,Beijing 100049,China)  
A series of thermal simulation experiments were carried out with crude samples(from the Lungu area of Tarim Basin) and samples mixed with elementary sulfur or n-propyl mercaptan in a confined system of gold tube-autoclave.The influences of sulfur on cracked gas of oil and the isotope composition of hydrocarbon gas are studied through comparing the yields of experimental products and their isotope compositions in each experiment.The results show that adding sulfur or organic sulfide slightly inhibits,as a whole,the generation of methane and other hydrocarbon gas,but facilitates the production of non-hydrocarbon gases such as hydrogen and carbon dioxide.Besides,the amount of elementary sulfur or organic sulfide has an apparent effect over the composition of the products.Adding sulfur will exert a significant impact upon the carbon isotope composition of hydrocarbon gas,causing the carbon isotope generated at low temperature to be heavier.The influence of organic sulfide over the products is especially significant,resulting in a positive difference of as high as 7‰upon the carbon isotope of methane,and 5‰upon that of ethane and propane.The study also suggests that the chemical state of sulfur has something to do with its influence upon the composition of oil-cracking products and that the mechanism of organic sulfide involving in cracking reaction is greatly different from that of elementary sulfur.
【Fund】: 中国科学院创新项目(KZCX-YW-114-1)
【CateGory Index】: P618.13
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