Urea- adduct paper chromatography has been applied in organic geochemistry for separating branched/cyclic hydrocarbons from n-alkanes in sedimentary rocks and oils.The adduct reaction is made in urea adsorbed on the p...Urea- adduct paper chromatography has been applied in organic geochemistry for separating branched/cyclic hydrocarbons from n-alkanes in sedimentary rocks and oils.The adduct reaction is made in urea adsorbed on the paper, and then developed by TLC(thin layer chromatography) technique. Experiments show that this method is of good efficiency. The whole procedure is simple and easily handled. This method is recommended for GC and GC-MS identification of organie components.展开更多
Steranoids and terpanoids in source rocks and crude oils from the Gaoyou depression have been analyzed by GC-MS.The fact that C20 sterane 14 α（H)17α(H)20S/14α（H）17α（H）20（R+S）%and C31 hopane 17α（H）21β（H...Steranoids and terpanoids in source rocks and crude oils from the Gaoyou depression have been analyzed by GC-MS.The fact that C20 sterane 14 α（H)17α(H)20S/14α（H）17α（H）20（R+S）%and C31 hopane 17α（H）21β（H）22S/17α（H）21β（H）22（R+S）%in the oils are higher than those in the source rocks,as has been revealed in this study,is eonsidered.to have resulted from,oil migration.By comparing steranes and hopanes in inmature oils from the eastern part of China with those in source rocks,it is suggested that the source rocks with over 10% C20 sterane 14α（H）17α（H），20S/14α（H）17α（H）20（R+S）%，over 3% C29 sterane 14β（H）17β（H）20（R+S）[14α（H）17α（H）20（R+S）+14β（H）17β（H）20（R+S）]% and≥50%,C31 hopane 17α（H）21β（H）22S/17α（H）21β（H）22(R+S)%in the eastern part of China may produce crude oils of commercial importance.It seems possible to find inmature oils in the sedimentary rocks at burial depths shallower than the oil-generating threshold and mature oils migrated from deep levels in shallow reservoirs.展开更多
文摘Urea- adduct paper chromatography has been applied in organic geochemistry for separating branched/cyclic hydrocarbons from n-alkanes in sedimentary rocks and oils.The adduct reaction is made in urea adsorbed on the paper, and then developed by TLC(thin layer chromatography) technique. Experiments show that this method is of good efficiency. The whole procedure is simple and easily handled. This method is recommended for GC and GC-MS identification of organie components.
文摘Steranoids and terpanoids in source rocks and crude oils from the Gaoyou depression have been analyzed by GC-MS.The fact that C20 sterane 14 α（H)17α(H)20S/14α（H）17α（H）20（R+S）%and C31 hopane 17α（H）21β（H）22S/17α（H）21β（H）22（R+S）%in the oils are higher than those in the source rocks,as has been revealed in this study,is eonsidered.to have resulted from,oil migration.By comparing steranes and hopanes in inmature oils from the eastern part of China with those in source rocks,it is suggested that the source rocks with over 10% C20 sterane 14α（H）17α（H），20S/14α（H）17α（H）20（R+S）%，over 3% C29 sterane 14β（H）17β（H）20（R+S）[14α（H）17α（H）20（R+S）+14β（H）17β（H）20（R+S）]% and≥50%,C31 hopane 17α（H）21β（H）22S/17α（H）21β（H）22(R+S)%in the eastern part of China may produce crude oils of commercial importance.It seems possible to find inmature oils in the sedimentary rocks at burial depths shallower than the oil-generating threshold and mature oils migrated from deep levels in shallow reservoirs.
