西湖凹陷始新统平湖组煤系烃源岩分子地球化学特征

doi:10.7623/syxb201201004

石油学报 ›› 2012, Vol. 33 ›› Issue (1): 32-39.DOI: 10.7623/syxb201201004

西湖凹陷始新统平湖组煤系烃源岩分子地球化学特征

朱扬明　周　洁　顾圣啸　李　颖

浙江大学地球科学系　浙江杭州　310027

收稿日期:2011-05-27 修回日期:2011-09-24 出版日期:2012-01-25 发布日期:2012-03-22
通讯作者: 朱扬明
作者简介:朱扬明，男，1954年11月生，1997年获中国科学院广州地球化学研究所博士学位，现为浙江大学地球科学系教授、博士生导师，主要从事有机地球化学研究与教学工作。
基金资助:
国家高技术研究发展计划（863）项目“海上油气地球化学快速探测技术”（2007AA09Z308）资助。

Molecular geochemistry of Eocene Pinghu Formation coal-bearing source rocks in the Xihu Depression, East China Sea Shelf Basin

ZHU Yangming　ZHOU Jie　GU Shengxiao　LI Ying

Received:2011-05-27 Revised:2011-09-24 Online:2012-01-25 Published:2012-03-22

摘要/Abstract

摘要：

60个饱和烃和芳烃组分的GC－MS分析资料表明，东海盆地西湖凹陷平湖组煤系烃源岩饱和烃中富含源于针叶树脂的二萜烷类生物标志物，甾烷中普遍以C₂₉化合物占优势（>45%），芳烃组分中惹烯、1，7-二甲基菲等陆源标志物含量异常高，这些结果反映该煤系烃源岩的成烃母质主要来源于陆源高等植物。相对于煤及碳质泥岩，暗色泥岩中C₂₇甾烷有较高含量，且正构烷烃呈双峰型分布，说明其有机质生物源中水生生物占有一定比例。该煤系烃源岩的Pr/Ph值大多分布在3.5~8.5，二苯并呋喃类化合物较多，指示这套烃源层主要形成于氧化性较强的湖沼相环境;部分暗色泥岩Pr/Ph值在1.5左右，可能属弱还原—弱氧化的半深湖相沉积。煤及碳质泥岩以高C₂₉甾烷（大于80%）、低伽马蜡烷（与C₃₀藿烷的比值低于0.05）与暗色泥岩形成区别。

关键词: 西湖凹陷, 煤系烃源岩, 生物标志物, 芳烃, 有机质生物源, 东海陆架盆地

Abstract:

GC/MS analytical data of 60 saturated and aromatic fractions revealed that saturated hydrocarbons from Pinghu Formation coal-bearing source rocks in the Xihu Depression of the East China Sea Shelf Basin are characterized by abundant diterpenoid compounds originated from resins of coniferous trees and dominant C₂₉in steranes（>45%）. Moreover, aromatic fractions are abnormally rich in terrigenous biomarkers, such as retene and 1,7-dimethylphenanthrene, indicating a predominant source of organic matter derived from terrigenous higher plants. Compared with coals and carbonaceous mudstones, dark mudstones show a relatively higher content of C₂₇ sterane and a bimodal distribution in n-alkanes, suggesting a certain proportion of aquatic organism contributions in the organic matter source. Source rocks as a whole are believed to be deposited in an oxic limnetic-facies environment, as reflected by high Pr/Ph ratios ranging mostly from 3.5 to 8.5 and abundant dibenzofuranes. However, some dark mudstones show relatively lower Pr/Ph values (round 1.5), suggesting a weakly reducing to suboxic semi-deep lake setting. Coals and carbonaceous mudstones can be distinguished from dark mudstones by a higher relative concentration of C₂₉ sterane (>80%) and lower gammacerane /C₃₀ hopane ratio (<0.05).

Key words: Xihu Depression, coal－bearing source rock, biomarker, aromatic hydrocarbon, biological source of organic matter, East China Sea Shelf Basin

朱扬明　周　洁　顾圣啸　李　颖. 西湖凹陷始新统平湖组煤系烃源岩分子地球化学特征[J]. 石油学报, 2012, 33(1): 32-39.

ZHU Yangming　ZHOU Jie　GU Shengxiao　LI Ying. Molecular geochemistry of Eocene Pinghu Formation coal-bearing source rocks in the Xihu Depression, East China Sea Shelf Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(1): 32-39.

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西湖凹陷始新统平湖组煤系烃源岩分子地球化学特征

Molecular geochemistry of Eocene Pinghu Formation coal-bearing source rocks in the Xihu Depression, East China Sea Shelf Basin

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