| In order to study the relation between sedimention of source rock and nitrogen-bearing containing, we have the sampling areas including Baise Basin, Tarim Basin, North part of Qaidam Basin and West part of Qaidam Basin, which are represent terrestial basin, marine basin, terrestial basin and saline basin. Over forty representive oils are analysed. All the crude oil samples were fractionated using a chromatography column .Gas chromatography (GC) and gas chromatography -mass spectrometry (GC-MS) were employed to analyze for pyrrolic nitrogen fractions. N-phenylcarbzole was added to the pyrrolic nitrogen fractions prior to GC-MS analysis and used as an internal standard to quantify individual pyrrolic compounds. And the main results we got are as follows:The terrestrial oils have low amount of notrogen from 5ug/g to 38ug/g, most of them are lower than 10ug/g, while the marine oils have the amount from 10ug/g to 55ug/g. The marine oils have a amount of methylcarbazole from 0.8ug/g to 2.3ug/g. Compared with the marine oils, the terrestrial oils have relatively low amount of methylcarbazole from 0.1ug/g to 0.7ug/g. The amount of benzocarbazole is higher in anoxic marine Basin(< 0.2ug/g) than oxic terrestrial environment(>0.2ug/g). The distribution of nitrogen compounds vary extinctly in various kinds of oils, which reflecting the difference in original organic matters and depositional environment.The ratios of 3-/4- methylcarbazole in terrestrial oils are higher than 1.0, while in marine oils the ratios are from 0.7 to 1.0. The ratios of 3-/4- methylcarbazole may reflecting different depositional environment of source rock..The amount of benzo[b]carbazole is higher in terrestrial basin(from 8% to 16%), compared with marine oils(from 0 to 8%). Benzo[b]carbazole might be indicative of terrigenous contributions. The ratios of a/(a+c) benzocarbazole(BC) is higher in baise basin than talimu basin, that means BC ratio is higher in terrestrial environment.
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