Studies of biological marker compou nds in five oil samples from a profile wherenormal crude oil,low condensate oil and heavy oil are produced in the Karamay Oilfield have been carried out with great empha-sis on the biodegradation-resisting capability of 13,17 secosteranes,8,14 secohopanes,gammacerane and carotenes.Based on these studies,a sequence of biodegradation-resisting intensities has been established for saturated hydrocarbon biomarkers in crude oils from the Karamay Oilfield.
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