Geochemical Characteristics and Origins of the Crude Oil of Triassic Yanchang Formation in Southwestern Yishan Slope, Ordos Basin

Figure 8

Cross plots of (C₁₉ tricyclic Terpanes + C₂₀ tricyclic Terpanes)/C₂₃ tricyclic Terpanes versus C₂₅ tricyclic Terpanes/C₂₆ tricyclic Terpanes (a) and gammacerane/αβ-C₃₀ Hopanes versus ∑ > C₃₀ Hopanes ratios (b) of the study crude oil and source rock samples in Southwestern of Yishan Slope.

(a)

(b)