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- W2056569663 abstract "Numerous petroleum-geochemical analyses of deeply buried, high-rank, fine-grained rocks from ultra-deep wellbores by different investigators demonstrate that C15+ hydrocarbons (HCs) persist in moderate to high concentrations at vitrinite reflectance (R0) values of 2.0–5.0% and persist in measurable concentrations up to R0 = 7.0–8.0%, at which point the thermal deadline for C15+ HC's is finally approached. Qualitative analyses have been carried out on (1) high-rank gas condensates which have been exposed to the HC-thermal-destructive phase, (2) bitumens from high-temperature aqueous-pyrolysis experiments in the HC-thermal-destructive phase, and (3) bitumens from high-rank, fine-grained rocks near the HC-thermal-destructive phase. On the other hand, accepted petroleum-geochemical paradigms place rigid limits on HC thermal stability: C15+ HCs begin thermal cracking at R0 values of 0.9% and are completely thermally destroyed by R0 = 1.35%; C2-C4 HC gases are thermally destroyed by R0 = 2.0% and methane is thermally destroyed by R0 = 4.0%. Furthermore, published data and observations in many HC basins worldwide support these models; for example, (1) sharp basinal zonations of gas and oil deposits vs. maturation rank in HC basins and (2) decreasing C15+ HC concentrations in some fine-grained rocks at ranks of R0 ≥ 0.9%. The fact that observed data (C15+ HCs thermally stable to R0 = 7.0–8.0%) is so far removed from predicted behavior (C15+) HCs expected to be thermally destroyed by R0 = 1.35%) may be due to (1) a lack of recognition of some important possible controlling parameters of organic matter (OM) metamorphism and too much importance given to other assumed controlling parameters; and (2) assigning HC distribution patterns in petroleum basins to HC thermal cracking when such patterns may be due to other causes." @default.
- W2056569663 created "2016-06-24" @default.
- W2056569663 creator A5063446317 @default.
- W2056569663 date "1993-07-01" @default.
- W2056569663 modified "2023-10-11" @default.
- W2056569663 title "Thermal stability of hydrocarbons in nature: Limits, evidence, characteristics, and possible controls" @default.
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- W2056569663 doi "https://doi.org/10.1016/0016-7037(93)90539-9" @default.
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