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

作　　者：LU Hong WANG QingTao JIANG LinXiang ZHANG Hui LIU JinZhong SHENG GuoYing PENG PingAn 

机构地区：[1]State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry, Chinese Academy of Sciences [2]Exploration and Development Institute of Changqing Oilfield,China National Petroleum Corporation

出　　处：《Science China Earth Sciences》2013年第11期1953-1961,共9页中国科学（地球科学英文版）

基　　金：supported by National Basic Research Program of China(Grant No.2012CB701404);Major National Science and Technology Project(Grant No.2011ZX05008-002-33);National Natural Science Foundation of China(Grant Nos.40873048,41173053);Gas Hydrate Survey in South Sea of China(Grant No.GZH2011003-05-04-01);This isa contribution to No.IS-1689 from Guangzhou Institute of Geochemistry,Chinese Academy of Sciences

摘　　要：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 processes 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 whereas unsuccessful cyclization and/or sulfurization result in the generation of short-chain steranes.This kind of mechanism of hydrogenation/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.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.

关 键 词：sulfur-containing steroids short-chain steranes SULFURIZATION hydrogenation C-S bond H2S Jinxian Sag 

分 类 号：P618.13[天文地球—矿床学]