Light Hydrocarbon Geochemistry: Insight into Mississippian Crude Oil Sources from the Anadarko Basin, Oklahoma, USA

Figure 5

(a) Ternary diagram comparing the relative abundance of three different isomers of dimethyldiamantane, including 4,9-dimethyldiamantane, 4,8-dimethyldiamantane, and 3,4-dimethyldiamantane. Dimethyldiamantanes are measured from m/z 201 mass-fragmentogram. Polygons of different source rock facies is from Schulz et al. [37], (b) Cross-plot for evaluating extent of cracking and oil mixing, comparing 3- + 4-methyldiamantanes versus regular stigmastane biomarker, after [35].

(a)

(b)