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

Figure 3

Oil correlation star diagrams (OCSD) (left) and oil transformation star diagrams (OTSD) (right). P1: 2,2-dimethylpentane + 2,3 dimethylpentane + 2,4-dimethylpentane + 3,3-dimethylpentane + 3-ethylpentane. 2,2-DMP: 2,2-dimethylpentane/P1; 2,3-DMP: 2,3-dimethylpentane/P1; 2,4-DMP: 2,4-dimethylpentane/P1; 3,3-DMP: 3,3-dimethylpentane/P1; EtP: 3-ethylpentane/P1; X: 1,1-dimethylcyclopentane; P2: 2-methylhexane + 3-methylhexane; TR1: toluene/X; TR2: nC₇/X; TR3: 3-methylhexane/X; TR4: 2-methylhexane/X; TR5: P2/X; TR6: 1-cis-2-dimethylcyclopentane/X; TR7: 1-trans-3-dimethylcyclopentane/X; TR8: P1/P2; C₇ 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; isoC₇ ratio: 2-methylhexane + 3-methylhexane/1-cis-3-DMCP + 1-trans-3DMCP + 1-trans-2-DMCP [19].