Unusual distribution of triterpane and sterane terrestrial biomarkers in yacheng condensates from Ying-Qiong basins, South China sea

Zhou Yi; Sheng Guo-ying; Fu Jia-mo; Geng An-song; Chen Jun-heng; Zhang Qi-ming; Pan Xian-zhuang; Huang Bao-jia

doi:10.1007/BF02849657

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Unusual distribution of triterpane and sterane terrestrial biomarkers in yacheng condensates from Ying-Qiong basins, South China sea

Updated：2023-05-16

- Unusual distribution of triterpane and sterane terrestrial biomarkers in yacheng condensates from Ying-Qiong basins, South China sea
- Journal of Oceanology and Limnology Vol. 20, Issue 2, Pages: 182-190(2002)
- Affiliations：
  
  1. State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences
  2. Institute of Oceanology Chinese Academy of Sciences
  3. Research Institute of Petroleum Exploration and Development Nanhai West Oil Corporation
- Author bio：
- Funds：
- DOI：10.1007/BF02849657
  CLC：
- Published：2002
- Accepted：
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Yi, Z., Guo-ying, S., Jia-mo, F. et al. Unusual distribution of triterpane and sterane terrestrial biomarkers in yacheng condensates from Ying-Qiong basins, South China sea., Chin. J. Ocean. Limnol. 20, 182–190 (2002). https://doi.org/10.1007/BF02849657
DOI：

Yi, Z., Guo-ying, S., Jia-mo, F. et al. Unusual distribution of triterpane and sterane terrestrial biomarkers in yacheng condensates from Ying-Qiong basins, South China sea., Chin. J. Ocean. Limnol. 20, 182–190 (2002). https://doi.org/10.1007/BF02849657 DOI：

摘要

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.

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references

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