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- Title
The characteristics and significances of cheilanthane tricyclic terpanes and bicyclic sesquiterpanes in source rocks and oils under different depositional environments in Zhu III Depression, Pearl River Mouth Basin.
- Authors
Jun-jun YOU; Xi-bing YANG; Ming-zhu LEI; Gang LIANG; Zi-ling WANG
- Abstract
The depositional environments and the oil-source relationship of the three important source rocks and their relative oils in Wenchang A/B Sag of Pearl River Mouth Basin have been elaborated by applying biomarkers of cheilanthane tricyclic terpanes and bicyclic sesquiterpanes in this article. The results suggest that the distribution characteristics of these two biomarkers in source rocks and oils are controlled by different sedimentary environments and variety inputs: (1)The mid-deep lacustrine source rocks and oils from Wenchang Formation have a very low abundance of rearrange drimanes, but a high abundance of 8β(H)-drimane, the C20-C21-C23 tricyclic terpanes appear to have similar mountain type distribution, indicating they are dominated by Lower biological algaes and formed in a partial reducing environment. (2)The shallow lacustrine source rocks and oils from Wenchang Formation have a middle abundance of drimanes and rearrange drimanes, the C19-C23 tricyclic terpanes appear to be rising type distribution with C23 the highest or decline gradually with C20 the highest, indicating they are dominated both by lower biological algaes and high plants inputs and formed in a reduction-oxidation environment. (3)The shallow lacustrine source rocks and oils from Enping Formation have a rich abundance of rearrange drimanes, but low abundance of drimanes, and the C19-C26 tricyclic terpanes decline quickly with C20 the highest, indicating they are dominated by high plants input and formed in an oxidation environment.
- Subjects
WATERSHEDS; ROCKS; PETROLEUM; MORPHOLOGY; VEGETABLE oils
- Publication
Natural Gas Geoscience, 2020, Vol 31, Issue 7, p2
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2020.03.010