Geochemistry and Genesis of Oil and Gas Seeps in the Junggar Basin, NW China: Implications for Hybrid Petroleum Systems

Figure 9

Plots of selected molecular geochemical parameters for oil-seep, crude-oil, and source-rock samples from the middle segment of the southern Junggar Basin. (a) δ¹³C (in ‰ relative to the VPDB standard) vs. Dia/Reg; (b) Pr/Ph vs. G/C₃₀H; (c) C₁₉T/C₂₀T vs. C₂₄Te/C₂₆T; (d) C₂₀T/C₂₁T vs. C₂₁T/C₂₃T; (e) Ts/Tm vs. Tm/C₃₀H; (f) C₂₉H/C₃₀H vs. C₃₅S/C₃₄S; (g) C₂₇/C₂₈ααα20R vs. C₂₈/C₂₉ααα20R; (h) C₂₉ααα20S/(20R+20S) vs. C₂₉αββ/(αββ+ααα). See Figure 5 for the abbreviations. Data from Table 2.

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