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AAPG Bulletin; Year: 2018; Issue: June DOI: 10.1306/08291717097
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Figure 4. Changes in reflectance of immature samples subjected to hydrous pyrolysis at various temperatures for 72 hr. (A) Results from this study in which reflectance was measured on petrographically identified vitrinite (Ro) in coals and solid bitumen (BRo) in shales. (B) Results from studies by Lewan (1985, 1993a) in which the two trends were identified as Ro and suppressed-Ro trends. Oven temperatures are assumed to be accurate to ±1°C.
Figure 4. Changes in reflectance of immature samples subjected to hydrous pyrolysis at various temperatures for 72 hr. (A) Results from this study in which reflectance was measured on petrographically identified vitrinite (Ro) in coals and solid bitumen (BRo) in shales. (B) Results from studies by Lewan (1985, 1993a) in which the two trends were identified as Ro and suppressed-Ro trends. Oven temperatures are assumed to be accurate to ±1°C.