Triterpane and sterane biomarkers in the YA13-1 condensates from Qiongdongnan Basin, South China Sea

doi:10.1016/S0009-2541(03)00123-2

	Triterpane and sterane biomarkers in the YA13-1 condensates from Qiongdongnan Basin, South China Sea
	Zhou, Y; Sheng, GY ; Fu, JM ; Geng, AS ; Chen, JH ; Xiong, YQ ; Zhang, QM
	2003-09-15
发表期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
卷号	199 期号:3-4 页码:343-359
文章类型	Article
摘要	Triterpanes and steranes in condensates from the YA13-1 gas field, Qiongdongnan Basin, were monitored. The YA13-1 condensates have unusual biomarker distributions dominated by terpanes and steranes derived from higher plants. Anomalously abundant 1 got-oleanane and remarkably abundant bicadinanes are present in the YA13-1 condensates, whereas the 17alpha-hopane contents are extremely low. Taraxastane and significantly abundant 17alpha-diahopanes occur in the condensates. In addition, a number of unknown C-29 and C-30 pentacyclic triterpanes including previously unreported compounds were detected in the condensates, some of which are significantly abundant. The unknown compounds may be terrestrial biomarkers. C-29 homologues are relatively predominant among the regular and rearranged steranes. The diasterane concentrations are markedly higher than those of regular steranes. The maturity of the YA13-1 condensates is relatively high, at the peak to late oil generation stage (corresponding to 0.85-1.10% Ro), based on sterane and terpane and including bicadinane maturity parameters (i.e. T/(T-1 + R) and 2T/R bicadinane ratios). The above maturity assessment result is different from that based on diamondoid maturity parameters (%Ro = 1.60-1.70) [Org. Geochem. 25 (1996) 179], which can be explained by a contribution of hydrocarbons from two sources at different depths. The YA13-1 condensates were probably generated from the Yacheng and Lingshui coal-bearing source rocks buried both in the Qiongdongnan Basin (3400-5000 m) and in the Yinggehai Basin (>5000 m). The possible contribution of lower maturity hydrocarbons from the Yacheng and Lingshui Formations (3400-4100 m) in the Qiongdongnan Basin to the YA13-1 gases and condensates should not be neglected. (C) 2003 Elsevier Science B.V. All rights reserved.; Triterpanes and steranes in condensates from the YA13-1 gas field, Qiongdongnan Basin, were monitored. The YA13-1 condensates have unusual biomarker distributions dominated by terpanes and steranes derived from higher plants. Anomalously abundant 1 got-oleanane and remarkably abundant bicadinanes are present in the YA13-1 condensates, whereas the 17alpha-hopane contents are extremely low. Taraxastane and significantly abundant 17alpha-diahopanes occur in the condensates. In addition, a number of unknown C-29 and C-30 pentacyclic triterpanes including previously unreported compounds were detected in the condensates, some of which are significantly abundant. The unknown compounds may be terrestrial biomarkers. C-29 homologues are relatively predominant among the regular and rearranged steranes. The diasterane concentrations are markedly higher than those of regular steranes. The maturity of the YA13-1 condensates is relatively high, at the peak to late oil generation stage (corresponding to 0.85-1.10% Ro), based on sterane and terpane and including bicadinane maturity parameters (i.e. T/(T-1 + R) and 2T/R bicadinane ratios). The above maturity assessment result is different from that based on diamondoid maturity parameters (%Ro = 1.60-1.70) [Org. Geochem. 25 (1996) 179], which can be explained by a contribution of hydrocarbons from two sources at different depths. The YA13-1 condensates were probably generated from the Yacheng and Lingshui coal-bearing source rocks buried both in the Qiongdongnan Basin (3400-5000 m) and in the Yinggehai Basin (>5000 m). The possible contribution of lower maturity hydrocarbons from the Yacheng and Lingshui Formations (3400-4100 m) in the Qiongdongnan Basin to the YA13-1 gases and condensates should not be neglected. (C) 2003 Elsevier Science B.V. All rights reserved.
关键词	Triterpanes Steranes Terrestrial Biomarkers Unknown Pentacyclic Triterpanes Molecular Maturity Ya13-1 Condensates Qiongdongnan Basin Yinggehai Basin China
学科领域	Geochemistry & Geophysics
DOI	10.1016/S0009-2541(03)00123-2
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000184681300011
引用统计	被引频次：16[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/2812
专题	海洋生态与环境科学重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 3.Nanhai W Oil Corp, Inst Petr Explorat & Dev, Zhanjiang 524057, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Y,Sheng, GY,Fu, JM,et al. Triterpane and sterane biomarkers in the YA13-1 condensates from Qiongdongnan Basin, South China Sea[J]. CHEMICAL GEOLOGY,2003,199(3-4):343-359.
APA	Zhou, Y.,Sheng, GY.,Fu, JM.,Geng, AS.,Chen, JH.,...&Zhang, QM.(2003).Triterpane and sterane biomarkers in the YA13-1 condensates from Qiongdongnan Basin, South China Sea.CHEMICAL GEOLOGY,199(3-4),343-359.
MLA	Zhou, Y,et al."Triterpane and sterane biomarkers in the YA13-1 condensates from Qiongdongnan Basin, South China Sea".CHEMICAL GEOLOGY 199.3-4(2003):343-359.

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