Could petroleum biodegradation be a joint achievement of aerobic and anaerobic microrganisms in deep sea reservoirs?

AMB Express

Table 1 Geological and geochemical bulk data.

Oil	Depth interval (m)	Age	Temp. (°C)	Reservoir	S (%)	Sat. HCs (%)	Arom. HCs (%)	NSOs (%)	° API	δ¹C_{VPDB (‰)}
P1	2812-2821	Early Cretaceus	85	Lagoa Feia Formation (coquinas)	0.18	50.70	25.35	23.94	30.7	-23.61
P2	2088-2100	Early Cretaceus	71	Macaé Formation (calcarenites)	0.65	42.55	23.68	33.77	19.7	-24.52