Abstract

Pr/nC17 and Ph/nC18 are normally available in geochemical analysis report. The data used to define sediment deposition environment and maturity. In this study, the comparison between Pr/nC17 and Ph/nC18 data from extracted mature rock and in crude oil regading to stratigraphy to reveal their relationship with oil&gas migration parth. The study results showed that Pr/nC17 and Ph/nC18 from extracted and crude oil reflect original oil and migration parth. Crude oil producing in Miocene & upper Oligocene and Lower Oligocene& Basement are mainly from Lower Oligocene+ Eocene? (E+F) source rock and one part of crude oil is generated from bottom part of formation D but only in most subsidising area of depression in central part of Cuu Long basin.