收稿日期: 2009-02-25
修回日期: 2009-06-30
网络出版日期: 2009-12-10
基金资助
中国石油冀东油田公司项目（编号：JDYJ-2006-JS-0026）资助.
Geochemical Characteristics of Es43 Source Rocks and Its Oil-source Contribution in Nanpu Sag, Bohai Bay Basin
Received date: 2009-02-25
Revised date: 2009-06-30
Online published: 2009-12-10
南堡凹陷为环渤海湾盆地一个小而富油的生烃凹陷，勘探前景极为广阔，其中沙三段四亚段(Es43)泥岩厚度大，分布范围广，为研究区最主要的烃源岩之一。通过对Es43段烃源岩的有机岩石学与有机地球化学常规分析，对该套烃源岩系统的研究与评价，并且结合原油与烃源岩的生物标志化合物的对比与分析，探讨其油源贡献。研究结果表明，Es43段部分层段生烃条件较好，有机质丰度与类型达到好烃源岩标准，依据生物标志化合物特征划分为2类，第一类烃源岩处于成熟阶段，主要形成于淡水的还原环境，生源构成为混合型，以低等水生生物和高等植物混源贡献为主;第二类烃源岩处于未熟—低熟阶段，主要形成于淡水氧化环境，以陆源高等植物输入为主，对油气贡献较少。油源对比结果表明，南堡凹陷高柳地区沙河街组的原油主要来源于Es43段第一类烃源岩。
梅玲,张枝焕,范有余,王旭东 . 南堡凹陷Es43段烃源岩有机地球化学特征及其油源贡献[J]. 天然气地球科学, 2009 , 20(6) : 961 -967 . DOI: 10.11764/j.issn.1672-1926.2009.06.961
The Nanpu sag is one of the oil-rich depressions in the Bohai Bay basin.The 4th section of the 3rd member of the Shahejie Formation (Es43) is the organic-rich source rock, playing a very important role in hydrocarbon generation in the Nanpu sag.The contribution of Es43 source rocks to petroleum reservoir has been discussed in this paper by evaluating source rocks and analyzing the geochemical features.The results show that the Es43 source rocks have good generation condition with high organic carbon and good type of kerogen.TheEs43 source rocks are classified into two types.The first type source rock is mature, deposited in a reducing environment, and originated from ordinary aquatic organisms and higher plants; the second type source rock is immature, deposited in a oxidation environment, and originated from primarily higher plants with minor contribution for oil accumulation.Oil-source correlation shows that the oil in the Shahejie Formation in the Gaoliu area sourced from the type I source rock.
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