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《Acta Sedimentologica Sinica》 2002-03
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Carbon Isotopic Composition and Yield of Gaseous Hydrocarbon by Oil Hydrous Pyrolysis in Rock Medium

FENG Zi-hui 1 CHI Yuan-lin 1 DU Hong-wen 1 HUO Qiu-li 1 HOU Du-jie 2 1 (Exploration and Development Research Institute of Daqing Oilfield, Heilongjiang Daqing 163712) 2 (Jianghan Petroleum Institute, Jiangzhon Hubei 434102)  
Hydrous pyrolysis experiments of generating gas from the mixture of oil-water and reservoir rocks have been caried out in a closed system,the samples are derived from deep layer of the Songliao basin.The results show that yield quantities of gaseous hydrcarbon is very small at temperature below 350℃,which mainly derived from oil evaporation.When simulating temperature reaches 400℃,large quantities of gas are generated from oil.With increasing of temperature the proprtion of methane in the generated gas increases,while the heavier components decrease particularly the propane.The range of temperature for gas largely generated from the mixture of oil -water sandstone is 450~500℃,while the range from the mixture of oil—water and igneous rocks is 450~600℃.The quantities of gaseous hydrocarbon generated from both settings are similar and about 17m 3/t oil at the end,but the hydrocarbon yield is different at each temperature point.The maximal yield at 500℃is respectively 78.67m 3/t oil abd 66.11m 3/t oil for the two experiments hydrolysis and catalysis may be an important influence on the composition and yield of the simulated gas.The experiment also shows that δ 13C values of the gas generated from the experiment at temperature between 400~450℃(R o approximately 1.3%~1.8%) are relatively lower than that of gas derived from kerogen,and δ 13C 1 is -50.86‰~-48.43‰.When the temperature increases to 550~600℃ (R o approximately 2.8%~3.4%),δ 13C of the gas brcomes reativly higher than that of gas derived from kerogen,and kerogen,and δ 13C 1 is -39.61‰~-24.26‰.This fact indicates that fractionation of carbon isotopon of gas from the experiment is stronger than the gas directly derived from kerogen.The regular sequence of carbon isotope has been found at temperature between 400~450℃ i.e.δ 13C 1δ 13C 2δ 13C 3δ 13C 4.But partial opposites sequence of carbon isotope appeared at temperature above 500℃,the sequence is δ 13C 1δ 13C 2δ 13C 3δ 13C 4. Comparing the carbon isotopic composition between the mixture of oil-water and sandstone and the mixture of oil-water and igneous rocks,the latter is lighter 1.2‰~4.2‰ than the fromer at the temperature of 400~450℃ and heavier at the temperature above 550℃,which show a different influence of catalysis in various medium.This result is useful for identifying the origin and maturation of nature gas for the deep layer of the Songliao basin.
【Fund】: 中国石油天然气集团公司“九五”科技工程资助项目 (编号 :970 2 0 6 - 0 2 )
【CateGory Index】: P618.13
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