Characteristics of carbazole compounds in ultra-deep marine oil from Fuman oilfield, Tarim Basin: Significance for thermal maturity assessment of crude oil

•Carbazoles in crude oil of Fuman Oilfield is affected by thermal maturity.•The concentrations of carbazole in marine oil decrease as maturity increases.•%Rc = −0.0335(1,8-DMCa/1-ECa) + 1.2902, %Rc calculated from MPI1.•%Rc1 = −0.0405 (1,8-DMCa/1-ECa) + 1.3418, %Rc1 calculated from MPR. Carbazoles i...

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