Formation and Identification of Unresolved Complex Mixtures in Lacustrine Biodegraded Oil from Nanxiang Basin, China

Table 2

Main geochemical parameters of oils from the northern slope.

Oil sample	Y3515	Y50714	YJ3624	B276	G412
C27/C27~C29-steranes	0.32	0.32	0.30	0.27	0.31
C28/C27~C29-steranes	0.33	0.33	0.34	0.33	0.31
C19/C23-tricyclic terpanes	0.05	0.03	0.03	0.12	0.07
C19~C22/C23~C26-tricyclic terpanes	0.62	0.50	0.50	1.17	0.74
C26-tricyclic/C24-tetracyclic terpane	2.24	2.32	2.38	1.72	2.51
C21~C22-pregnanes/(steranes + diasteranes)	0.02	0.02	0.01	0.03	0.03
C19~C29-tricyclic terpanes//:191	0.29	0.25	0.23	0.32	0.30
C19~C29-tricyclic terpanes/C30-hopane	1.30	1.12	0.97	1.49	1.33
C27~C29-diasteranes/steranes	0.05	0.05	0.05	0.06	0.06
Ts/(Ts + Tm)	0.15	0.15	0.15	0.10	0.14
C31~C35-homohopanes/C30-hopane	0.58	0.61	0.60	0.61	0.54