THE EFFECT OF BIODEGRADATION ON THE DISTRIBUTION AND COMPOSITION OF ALKYLNAPHTHALENE SERIES IN BIODEGRADED CRUDE OILS

Alkylnaphthalene series are the important geochemical parameters to indicate the thermal evolution.Fourteen biodegraded oil samples from Lengdong Oilfield of the Liaohe Basin have been analyzed.The distributions and relative compositions of dimethylnaphthalenes(DMNs),trimethylnaphthalenes(TMNs) and tetramethylnaphthalenes(TeMNs) in differently biodegraded oils have been studied.The biodegradation sequence has been set up,that is,the resistant ability for alkylnaphthalene series to biodegradation is DMNs