东海盆地西湖凹陷原油轻烃地球化学特征及油源区分
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  • 英文篇名:Oil's light hydrocarbon,geochemical characteristics and sources in Xihu sag,the east China sea basin
  • 作者:吴江 ; 侯读杰 ; 许汇源 ; 许婷 ; 徐发 ; 曹冰 ; 陈晓东
  • 英文作者:WU Jiang;HOU Dujie;XU Huiyuan;XU Ting;XU Fa;CAO Bing;CHEN Xiaodong;School of Energy Resources,China University of Geosciences(Beijing);MOE Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism,China University of Geosciences(Beijing);Shanghai Branch of CNOOC Limited;
  • 关键词:西湖凹陷 ; 轻烃 ; 油源分析 ; ; 泥岩 ; 蒸发分馏
  • 英文关键词:Xihu sag;;light hydrocarbon;;oil correlation;;coal;;mudstone;;evaporative fractionation
  • 中文刊名:DQSY
  • 英文刊名:Journal of Northeast Petroleum University
  • 机构:中国地质大学(北京)能源学院;中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室;中海石油(中国)有限公司上海分公司;
  • 出版日期:2015-11-10 11:46
  • 出版单位:东北石油大学学报
  • 年:2015
  • 期:v.39;No.195
  • 基金:国家科技重大专项(2011ZX05023003-001-010)
  • 语种:中文;
  • 页:DQSY201505004
  • 页数:10
  • CN:05
  • ISSN:23-1582/TE
  • 分类号:6+35-43
摘要
为了研究西湖凹陷原油轻烃地球化学特征及区分油气来源,利用气相色谱仪分析西湖凹陷16个原油样品,采用庚烷值与异庚烷值对原油成熟度进行划分.结果表明:西湖凹陷原油富含芳烃和环烷烃,直链烷烃含量低,以陆源有机质贡献为主;原油经历较为明显的蒸发分馏作用;异庚烷值与正庚烷值分别介于0.69~1.90和11.5~21.9之间,原油处于成熟油阶段.西湖凹陷不同地区的原油在轻烃组分上存在明显差异,指示原油母质来源的不同.同时,利用原油C7轻烃三角图和Halpern C7星状图,并结合原油碳同位素与芳烷指数,可以进一步区分各地区原油的母质来源.平湖地区原油主要为来自平湖组煤与泥岩的混合贡献,黄岩地区原油主要为花港组与平湖组泥岩贡献.
        Coal and mudstone source rocks were widely developed in the Xihu sag of east China sea basin,where oil and gas were mainly sourced from two types of source rocks.In order to study the light hydrocarbon geochemical characteristics of crude oil in Xihu sag and the source of oil and gas,16 crude oil samples in Xihu sag were analyzed by gas chromatography.The results show that the oils in Xihu sag have a relatively high content of aromatics and naphthenic hydrocarbon while a low content of straight chain alkanes,indicating that a great contribution from the terrestrial organic matters was made.The oils have obviously experienced the evaporative fractionation;the thermal maturity of oils is at the mature stage according to the isoheptane value and heptane value are between 0.69%~1.90% and 11.5%~21.9% respectively.The oils from different regions of Xihu sag have significant differences in light hydrocarbon components,indicating the different original source of oils.By means of oils C7 light hydrocarbon triangular diagram and the Halpern C7 star correlation diagram,combining with oil carbon isotope and aralkyl index,the original source of oils in various regions can be further distinguished.From all analyses above,it is concluded that the oils in Pinghu area were main from coal mixed with mudstone source rocks of Pinghu formation,and the oils in Huangyan area were mainly contributed from the Huagang and Pinghu mudstone measures.
引文
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