Journal
ORGANIC GEOCHEMISTRY
Volume 76, Issue -, Pages 48-61Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.orggeochem.2014.07.014
Keywords
Overprinting; Maturity; Aromatic hydrocarbon; Sterane; Light oils; Chepaizi High; Junggar Basin
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Funding
- Major National Science and Technology Project of China [2011ZX05003-001]
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The saturated and aromatic hydrocarbon maturity characteristics of crude oils from the eastern Chepaizi High in the Junggar Basin of northwest China were analyzed in detail. The results show that sterane maturity parameters for light oils from the Neogene Shawan Formation differ from other maturity parameters. Sterane alpha alpha alpha C-29 20S/(20S + 20R) and C-29 beta beta/(beta beta + alpha alpha) ratios indicate low maturity, while aromatic hydrocarbons indicate high maturity. We infer that light oils from the Shawan Formation have higher maturity than Cretaceous and Jurassic crude oils and were generated at equivalent vitrinite reflectance of similar to 0.9-1.2%. It can be concluded that the Shawan light oils originated mainly from deeply buried, highly mature Jurassic source rocks, southeast of Sikeshu Sag, southwest of Shawan Sag, and west of Huomatu Anticline Belt. During upward migration, crude oils generated from Jurassic source rock dissolved less mature Cretaceous bitumen resulting in a mixture with apparently conflicting parameters. Phase fractionation during migration also could have contributed to the anomalously low sterane maturity parameters. (C) 2014 Elsevier Ltd. All rights reserved.
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