| UNUSUAL DISTRIBUTION OF TRITERPANE AND STERANE TERRESTRIAL BIOMARKERS IN YACHENG CONDENSATES FROM YING-QIONG BASINS, SOUTH CHINA SEA |
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| 作者姓名： | 周毅 盛国英 傅家膜 耿安松 陈军红 张启明 潘贤庄 黄保家 |
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| 作者单位： | [1]StateKeyLaboratoryofOrganicGeochemistry,GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences,Guangzhou510640,China [2]InstituteofOceanology,ChineseAcademyofSciences,Qingdao266071，China [3]ResearchInstituteofPetroleumExplorationandDevelopment,NanhaiWestOilCorporation,Zhanfiang524057,China |
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| 基金项目： | theMinistryofScienceandTechnologyofChina ,GrantNo.85 1 0 2 1 0 2andtheNationalNatu ralScienceFoundationofChina (No.30 1 0 0 1 39) |
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| 摘 要： | The condensates from the Yacheng Gas Field, Ying-Qiong Basins, have unusual chemical characteristics, with distribution dominated by terpanes and steranes derived from higher-plants. Pr/Ph ratios (6- 11 ) are very high. Drimane, cadinanes and homocadinanes exist in high concentration. Anomalously abundant 18α(H)-oleanane and remarkably abundant bicadinanes are present in Yacheng condensates, while 17α( H)-hopanes are in extremely low concentration. Taraxastane and significantlyabundant 17α(H)-diabopanes occur in the condensates. In addition, a number of C29 and C30 unknown pentacyclic triterpanes were monitored in the condensates, some of which are abundant. The unknown compounds may be terrestrial biomarkers or their occurrence may suggest a sub-oxic (dyacrobic) clay-rich depositional environment. C29 homologues are relatively predominant in regular and rearranged steranes. The concentration of diasteranes is markedly higher than that of regular steranes. The characteristics of Yacheng condensates are indicative of terrestrial source input. Based on condensate-condensate and con-densate-rock correlations, combined with results of studies on sedimentary facies. Yacheng condensates may be sourced from Yacheng and Lingshui Formations in the Qiongdongnan Basin. The maturity of Yacheng condensate is relatively high, at late oil window stage ( corresponding to 0.9 % - 1.3 % R0 ),based on sterane and terpane maturity parameters.
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| 关 键 词： | 三萜烷 冷凝物 天然气田 南海 中国 |
| 收稿时间： | 7 April 2000 |
| 修稿时间： | 4 August 2001 |
Unusual distribution of triterpane and sterane terrestrial biomarkers in yacheng condensates from Ying-Qiong basins,South China sea |
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| Zhou Yi,Sheng Guo-ying,Fu Jia-mo,Geng An-song,Chen Jun-heng,Zhang Qi-ming,Pan Xian-zhuang,Huang Bao-jia.UNUSUAL DISTRIBUTION OF TRITERPANE AND STERANE TERRESTRIAL BIOMARKERS IN YACHENG CONDENSATES FROM YING-QIONG BASINS, SOUTH CHINA SEA[J].Chinese Journal of Oceanology and Limnology,2002,20(2):182-190. |
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| Authors: | Zhou Yi Sheng Guo-ying Fu Jia-mo Geng An-song Chen Jun-heng Zhang Qi-ming Pan Xian-zhuang Huang Bao-jia |
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| Institution: | (1) State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China;(2) Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao, China;(3) Research Institute of Petroleum Exploration and Development, Nanhai West Oil Corporation, 524057 Zhanjiang, China |
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| Abstract: | The condensates from the Yacheng Gas Field, Ying-Qiong Basins, have unusual chemical characteristics, with distribution dominated
by terpanes and steranes derived from higher-plants. Pr/Ph ratios (6–11) are very high. Drimane, cadinanes and homocadinanes
exist in high concentration. Anomalously abundant 18α(H)-oleanane and remarkably abundant bicadinanes are present in Yacheng
condensates, while 17α(H)-hopanes are in extremely low concentration. Taraxastane and significantly abundant 17α(H)-diahopanes
occur in the condensates. In addition, a number of C29 and C30 unknown pentacyclic triterpanes were monitored in the condensates, some of which are abundant. The unknown compounds may
be terrestrial biomarkers or their occurrence may suggest a sub-oxic (dyacrobic) clay-rich depositional environment. C29 homologues are relatively predominant in regular and rearranged steranes. The concentration of diasteranes is markedly higher
than that of regular steranes. The characteristics of Yacheng condensates are indicative of terrestrial source input. Based
on condensate-condensate and condensate-rock correlations, combined with results of studies on sedimentary facies. Yacheng
condensates may be sourced from Yacheng and Lingshui Formations in the Qiongdongnan Basin. The maturity of Yacheng condensate
is relatively high, at late oil window stage (corresponding to 0.9%–1.3% R0), based on sterane and terpane maturity parameters.
This work was supported by the Ministry of Science and Technology of China, Grant No. 85-102-10-2 and the National Natural
Science Foundation of China (No. 30100139). |
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| Keywords: | Yacheng condensates triterpanes steranes terrestrial biomarkers unknown pentacyclic triterpanes |
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