Identification and formation of sulfur-containing steroids in sulfur-rich heavy oils in the Jinxian Sag, Bohai Bay Basin, North China

High abundant sulfur-containing steroids were identified and detected in saturate hydrocarbon fractions of heavy oil with a high sulfur content in the Jinxian Sag, Bohai Bay Basin, North China. These sulfur-containing steroids were structurally merged into the D-ring of steroid nucleus with thiophen...

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Bibliographic Details
Published in:Science China. Earth sciences 2013-11, Vol.56 (11), p.1953-1961
Main Authors: Lu, Hong, Wang, QingTao, Jiang, LinXiang, Zhang, Hui, Liu, JinZhong, Sheng, GuoYing, Peng, PingAn
Format: Article
Language:English
Subjects:
Basins
Bonding
China
Earth and Environmental Science
Earth Sciences
Geochemistry
Hydrogen sulfide
Hydrogenation
Research Paper
Rocks
Sag
Steroids
Sulfur
Sulfurization
中国
凹陷
渤海湾盆地
甾族化合物
类固醇
重油
鉴定
高含硫
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Summary:High abundant sulfur-containing steroids were identified and detected in saturate hydrocarbon fractions of heavy oil with a high sulfur content in the Jinxian Sag, Bohai Bay Basin, North China. These sulfur-containing steroids were structurally merged into the D-ring of steroid nucleus with thiophene ring and/or combined into the C-22 in the side-chain. Based on the previous reports of sulfur-containing steroids with methylthio- steroids and intra-molecular form, four formation mechanisms of sulfur-containing steroids and diagenetic pathway of steroids under S-rich conditions were proposed in this paper according to the double bond positions in the sterene compounds. Hydrogenation and sulfurization both occurred in the diagenetic pro- cesses of olefinic bond in the side-chain of steroids： abiogenic chemical hydrogenation of H2S and HS- leads to the formation of regular steranes; a successful sulfurization process leads to the formation of the side-chain sulfur-containing steroids where- as unsuccessful cyclization and/or sulfurization result in the generation of short-chain steranes. This kind of mechanism of hy- drogenation/sulfurization of side-chain olefinic bond provides a potential genesis clue for the occurrence of high abundance of short-chain steranes （higher than the common regular steroids, phytane and n-alkanes） in S-rich heavy oils and source rocks in the Jinxian Sag, Bohai Bay Basin, North China.
ISSN:1674-7313
1869-1897
DOI:10.1007/s11430-013-4651-0