The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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AAPG Bulletin; Year: 2020; Issue: June DOI: 10.1306/0122201618217407
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Figure 23. Plot of C29ααα 20R stigmastane against 3-methyldiamantane + 4-methyldiamantane (3 + 4 MD) concentrations (modified after He et al., 2012), indicating thermal cracking and mixing in Niger Delta oils. Oils should plot within the oval lines based on maturity and cracking alone and without mixing of high-maturity oils and low-maturity ones. The arrows indicate maturity and cracking trends in samples that are not mixed.
Figure 23. Plot of C29ααα 20R stigmastane against 3-methyldiamantane + 4-methyldiamantane (3 + 4 MD) concentrations (modified after He et al., 2012), indicating thermal cracking and mixing in Niger Delta oils. Oils should plot within the oval lines based on maturity and cracking alone and without mixing of high-maturity oils and low-maturity ones. The arrows indicate maturity and cracking trends in samples that are not mixed.