[Retracted] Geochemical Characteristics of Crude Oil in Member 7 of Yanchang Formation in Yanchang Oilfield

Table 3

Terpene crude oil maturity mark.

Specific value	Oil generation stage	Balance point	Overripe-over-ripe
Epihopane C31-αβ22S/(C31-αβ22S + C31-αβ22R)	0.5∼0.54	0.6	0.57∼0.63
β hopane/β α monane	1.0	4.0∼7.0	>7.0