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- W2760785498 abstract "Solid bitumen is a common organic component of thermally mature shales and typically is identified by embayment against euhedral mineral terminations and by groundmass textures. However, because these textures are not always present, solid bitumen can be easily misidentified as vitrinite. Hydrous pyrolysis experiments (72 hours, 300-360°C) on shale and coal samples show solid bitumen reflectance (BRo) in shales is less responsive to thermal stress than vitrinite reflectance (VRo) in coal. This effect is most pronounced at lower experimental temperatures (300-320°C) whereas reflectance changes are more similar at higher temperatures (340-360°C). Neither a ‘vitrinite-like’ maceral or ‘suppressed vitrinite’ was identified or measured in our sample set; rather, the experiments show that solid bitumen matures slower than vitrinite. The data may explain some reports of ‘vitrinite reflectance suppression’, particularly at lower thermal maturity (VRo≤1.0%), as a simple case of solid bitumen being mistaken for vitrinite. Further, the experimental results confirm previous empirical observations that VRo and BRo are more similar at higher maturities (VRo>1.0%). It is suggested that ‘vitrinite reflectance suppression’, commonly reported from upper Paleozoic marine shales of early to mid-oil window maturity, is a misnomer. This observation has important implications to petroleum exploration models and resource assessment because it may change interpretations for the timing and spatial locations of kerogen maturation and petroleum generation." @default.
- W2760785498 created "2017-10-06" @default.
- W2760785498 creator A5044117230 @default.
- W2760785498 creator A5078640339 @default.
- W2760785498 date "2018-06-01" @default.
- W2760785498 modified "2023-10-16" @default.
- W2760785498 title "Understanding and distinguishing reflectance measurements of solid bitumen and vitrinite using hydrous pyrolysis: Implications to petroleum assessment" @default.
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- W2760785498 doi "https://doi.org/10.1306/08291717097" @default.
- W2760785498 hasPublicationYear "2018" @default.
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