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

Figure 4

(a) Cross-plot of heptane versus isoheptane ratios to assess crude oil maturity from Mississippian and Woodford of the three oils groups defined in Table 1. Heptane ratio: 100n-heptane/cyclohexane + 2-methylhexane + 1,1-dimethylcyclopentane (DMCP) + 3-methylhexane + 1-cis-3-DMCP + 1-trans-3DMCP + 1-trans-2-DMCP + n-heptane + methylcyclohexane; isoheptane ratio: 2-methylhexane +3-methylhexane/1-cis-3-DMCP + 1-trans-3DMCP + 1-trans-2-DMCP. (b) Regional maturity of the Woodford Shale created using correlation gridding based on vitrinite reflectance measurements available from literature [2, 26, 27].

(a)

(b)