H: C 29 Tm17 α (H)21 β (H)-norhopane; C 29 Ts: C 29 Ts18 α (H)-norneohopane; Normor: C 29 normoretane; C 30 H: C 30 17 α (H)-hopane; C 30 Ts: 17 α (H)-30-nor-29-homohopane; Mor: C 30 moretane; C31HS: C 31 22S 17 α (H) homohopane; C 31 HR: C 31 22R 17 α (H) homohopane; C 31 HS: C 31 22S 17 α (H

Fig. 9. Histogram of the distribution of the C 35 /C 34 homohopane ratio in oils from the Bazhenov horizon of the West Siberian petroleum province. The intervals of the C 35 /C 34 homohopane ratio on the abscissa are: 1 – 0.4–0.6; 2 – 0.6–0.8; 3 – 0.8–1.0; 4 – 1.0–1.2; 5 – 1.2–1.4. The ordinate

Figure 15. The mass-to-charge ratio (m/z) 191 and 205 chromatograms for the Woodford (A, C) and Viola (B, D) extracts. The m/z 205 is a fragment ion for the regular C 31 homohopanes, but it is more typically used to monitor the presence of the series of methylhopanes. The Viola extract has

Figure 8. Average values for extended homohopane abundances in Berea oils and source rock solvent extracts. The polygon labeled Berea oils encompasses all Berea oil compositions.

Figure 9. Gammacerane index (Gam/Hop; ratio of gammacerane to 17α, 21β-30-homohopane (22R)) versus pristane-to-phytane (Pr/Ph) for Berea oils and solvent extracts. Data for average ( n = 21) eastern (E.) Ohio Devonian oil from GeoMark (2015) . Red arrows point to high-maturity solvent extracts

Fig. 6. Correlation of oleanane/C 30 hopane and C 35 /(C 31 –C 35 ) homohopane of crude oils.

Figure 9 Homohopane distribution (C 31 –C 35 ) from Talara oil sample 1 (representative for all oils) indicates nonpreservation of the higher homohopanes, typical of suboxic bottom water during deposition.

Figure 5 The homohopane index of bitumen extracts from the Mowry shale (squares) and from Niger Delta oils (dashed line ranges) vs. the measured hydrogen index of the Mowry shale kerogen and the predicted hydrogen index values for the source rock of the Niger Delta oils, assuming the same

Fig. 11. Biomarker cross-plot of homohopane index (C 35 prominence - C 35 /ΣC 31 to C 35 ) versus the ratio of C 34 /C 33 extended hopanes (C 34 prominence).

Figure 6 —Representative homohopane distribution of oil families from the Mexican southeastern basins. Key calculation of percent of homohopanes is given in Table 2 .

Figure 6 —Viscosity vs. homohopane index in Cymric field produced oils. The regression excludes the oil from the 0219S well, which has an unusually large saturated hydrocarbon fraction and may represent an oil fractionated by the enhanced oil recovery process. The equation calculated here is used

Figure 6 —The C 35 homohopane index [100 ⋅ C 35 (Σ C 31 -C 35 )] for the group 1 oils increases offshore, suggesting a shift in the source rock to more reducing depositional conditions.

* BIO = biodegraded. The oleanane index and homohopane index are not reported for Beaufort samples with biodegradation ranks ≥ 5 ( Table 1 ). † Calculated as [the sum of the 17α and 17β, 24,28-bisnorlupane peak areas on m/z 341]/[the oleanane peak area on m/z = 191]. †† ND = no data

Figure 4 —Homohopane Index in rock extracts correlates strongly with kerogen H/C ratio and Hydrogen Index.

Table 4. C 31 to C 35 17#x03B1;, 21#x03B2;(H)-Homohopane Distributions for West Siberian Basin Samples, Russia

Figure 11 —West Siberian oils and bitumens show homohopane distributions that assist in differentiating groups ( Table 4 ). Homohopane distributions for nonbiodegraded Bazhenov-sourced oils (e.g., Fedorov 78, Urengoi 140) and bitumens from Bazhenov source rocks (Pokachev 58 and Salym 123

Table 8. C 31 to C 35 17α,21β(H)-Homohopane Distributions for West Siberian Basin Samples, Russia

= C 30 hopane; 8 = moretane; 9 = C 31 homohopanes; 10 = gammacerane; 11 = C 32 homohopanes; 12 = C 33 homohopanes; 13 = C 34 homohopanes; 14 = C 35 homohopanes. One section of the chromatogram for 01TC119 is expanded and shows the C 28 and C 29 tricyclics and T s (peak 3), which were used

Figure 6. Depth profiles of the C 40 aromatic carotenoids, paleorenieratane, isorenieratane, and renierapurpurane; the summed C 15 –C 31 2,3,6- and 3,4,5-aryl isoprenoids; the gammacerane index (gammacerane/C 30 hopane); the dinorhopane index (28,30-dinorhopane/C 30 hopane); the homohopane

; 30H = C30 17α (H), 21β (H)-hopane; M = C30 17β (H), 21α (H)-hopane; 31H = C31 17α (H), 21β (H)-homohopane 22S+22R; Gam = gammacerane; 31M = C31 17β (H), 21α (H)-homohopane; 32H = C32 17α (H), 21β (H)-homohopane 22S+22R; and 33H = C33 17α (H), 21β (H)-homohopane 22S+22R.