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Petrology and organic geochemistry of the Baishaping and Damaidi Devonian cutinitic liptobioliths,west of the Kangdian Uplift,China

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Petroleum Science 2022年第5期19卷 1978-1992页

作者： Dao-Fu Song Tie-Guan Wang Ping Li Mai Zhang An-Liang Liu Jia-Dong Yan State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China

Devonian cutinitic liptobiolith is a special type of coal formed during the early evolutionary stage of land *** Baishaping and Damaidi Devonian coals are notable for their distinct papery,sheet-like texture,and unusually high cutinite content(>50%),belonging to typical cutinitic *** are bituminous coals and have a suppressed vitrinite *** with typical typeⅢkerogen,these liptobioliths are characterized by extremely high yields of volatile matter and high hydrogen contents owing to their enhanced cutinite *** indicated by pyrolysis and elemental analysis results,the Devonian cutinitic liptobioliths are dominated by typeⅠ-Ⅱkerogens and have an excellent potential to generate liquid *** Baishaping cutinitic liptobioliths are mainly composed of ribbon-like thick-walled cutinites,with small amounts of thin-walled *** is only present in trace amounts and is dominated by ***,the Damaidi Devonian coals are primarily composed of ribbon-like thin-walled cutinites,followed by collotelinites which are usually sandwiched by *** different petrological characteristics of the Baishaping and Damaidi liptobioliths might indicate a structural variation in the coal-forming plant cuticles and two distinct coal-forming *** molecular bio markers in the Devonian coals are mainly composed of C_(18)-C_(20)tetracyclic diterpenoids,which are assumed to be the dominant soluble constituent of the Devonian land-plant cuticles and might have played an important role in early land plant *** molecules include aromatic tetracyclic diterpenoids,3-5 ring polycyclic aromatic hydrocarbons and their methylated counterparts,and C_(16)-and C_(18)-monocarboxylic acids.n-Alkanes are present only in small *** molecular composition of the cutinite-rich coals is unexpected,because cuticular waxes are one of the most important sources of *** general,the petrology and geochemistry

关键词： Coal chemistry Macerals Hydrocarbon potential Plant cuticles tetracyclic diterpenoids

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