东营凹陷古近系红层油气来源及勘探潜力分析
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摘要
利用沉积学和地球化学相结合的研究方法,分析了东营凹陷古近系Es4下、Es4上和Es3下3套烃源岩基本特征及其分布规律。在此基础上进一步研究了红层中已发现原油的物理性质、族组分和生物标志化合物特征,并对红层原油类型进行了划分,通过油源对比,明确了每类原油的来源。研究表明,红层原油的主力油源层不仅仅只有Es4上和Es3下2套烃源岩,以往认识较为薄弱的Es4下烃源岩也做出了较大贡献。综合分析认为,东营凹陷古近系红层具有较大的勘探潜力,为近期增储上产的主要领域。
Through the combination of sedimentological and geochemical analyses,characteristics and distribution rules of the Paleogene source rocks of Lower Es4,Upper Es4 and Lower Es3 Members are analyzed in this paper.Then the physical properties,group compositions and biomarker features of the discovered oils in red rocks are further studied.The oils in the red rocks can be divided into different types.On the basis of oil-source correlation,the origins of the oils are determined.The results show that not only Upper Es4 and Lower Es3 Members,but Lower Es4 Member which was poorly understood in the past make great contributions to oil formation in red rocks.It can be concluded that Paleogene red rocks in the Dongying sag have great exploration potential.They will be the major areas for reserve and production increase in the near future.
Through the combination of sedimentological and geochemical analyses,characteristics and distribution rules of the Paleogene source rocks of Lower Es4,Upper Es4 and Lower Es3 Members are analyzed in this paper.Then the physical properties,group compositions and biomarker features of the discovered oils in red rocks are further studied.The oils in the red rocks can be divided into different types.On the basis of oil-source correlation,the origins of the oils are determined.The results show that not only Upper Es4 and Lower Es3 Members,but Lower Es4 Member which was poorly understood in the past make great contributions to oil formation in red rocks.It can be concluded that Paleogene red rocks in the Dongying sag have great exploration potential.They will be the major areas for reserve and production increase in the near future.
引文
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[2]Pan Yuanlin,Li Sitian.Study of Large-scale Continental RiftBasin Sequence Stratigraphy and Subtle Oil and Gas Reser-voir:Taking Jiyang Depression for Example[M].Beijing:Pe-troleum Industry Press,2004:57-81.[潘元林,李思田.大型陆相断陷盆地层序地层与隐蔽油气藏研究——以济阳坳陷为例[M].北京:石油工业出版社,2004:57-81.]
[3]Zhang Linye,Kong Xiangxing,Zhang Chunrong,et al.High-quality oil-prone source rocks in Jiyang depression[J].Geo-chemistry,2003,32(1):35-42.[张林晔,孔祥星,张春荣,等.济阳坳陷下第三系优质烃源岩的发育及其意义[J].地球化学,2003,32(1):35-42.]
[4]Zhang Linye,Liu Qing,Zhang Chunrong.Study on the Genet-ic Relationships between Hydrocarbon Occurrence and PoolsFormation in Dongying Depression[M].Beijing:Geology Press,2005:49-64.[张林晔,刘庆,张春荣.东营凹陷成烃与成藏关系研究[M].北京:地质出版社,2005:49-64.]
[5]Wang Ru.Geochemical characteristics and oil source study of lightoil in the deep Es4lower layers underlying layers in the northernDongying sag[J].Natural Gas Geoscience,2009,20(2):278-281.[王茹.东营凹陷北带深层Es4下盐下段轻质油地球化学特征及油源探讨[J].天然气地球科学,2009,20(2):278-281.]
[6]LüHui,Chen Zhilin,Wang Zhong,et al.Distribution of highmolecular weight hydrocarbons and genesis of high wax con-tent oil from the south slope zone of the Dongying sag,theJiyang depression[J].Oil and Gas Geology,2008,29(3):355-360.[吕慧,陈致林,王忠,等.济阳坳陷东营凹陷南斜坡高蜡原油高分子量烃类分布及高蜡成因[J].石油与天然气地质,2008,29(3):355-360.]
[7]Wang Jufeng.Background for oil and gas accumulation of Es4sub-salt reservoir in Dongying sag,Shandong[J].Geoscience,2009,23(2):313-318.[王居峰.山东东营凹陷沙四段盐下层油气成藏条件分析[J].现代地质,2009,23(2):313-318.]
[8]Zhang Haijun,Xue Tianqing.Es4sedimentary faces in mid-northof Dongying depression[J].Journal of Jianghan Petroleum Institu-te,2003,25(3):38-39.[张海君,薛天庆.东营凹陷中北部沙四段沉积相研究[J].江汉石油学院学报,2003,25(3):38-39.]
[9]Zhang Linye,Zhang Chunrong.Formation Mechanism and Pe-troleum System of Immature Oil[M].Beijing:Geology Press,1999:22-23.[张林晔,张春荣.低熟油生成机理及成油体系——以济阳坳陷牛庄洼陷南部斜坡为例[M].北京:地质出版社,1999:22-23.]
[10]Zhu Guangyou,Jin Qiang,Dai Jinxing,et al.Investigation on thesalt lake source rocks for middle Shasi column of Dongying de-pression[J].Geological Journal of China Universitie,2004,10(2):257-266.[朱光有,金强,戴金星,等.东营凹陷沙四中亚段盐湖相烃源岩研究[J].高校地质学报,2004,10(2):257-266.]
[11]Yang Chupeng,Chen Jianyu.Petroleum genetic types and indepth exploration potential in the Boxing subsag[J].Petrole-um Geology and Recovery Efficiency,2004,11(3):34-37.[杨楚鹏,陈建渝.博兴洼陷油气成因类型及深层勘探潜力[J].油气地质与采收率,2004,11(3):34-37.]
[12]Wang Juan,Jin Qiang,Ma Guozheng,et al.Catalytic action of sul-phate evaporates in pyrolytic gas generation of source rocks[J].Natural Gas Geoscience,2009,20(1):26-31.[王娟,金强,马国政,等.高成熟阶段膏岩等盐类物质在烃源岩热解生烃过程中的催化作用[J].天然气地球科学,2009,20(1):26-31.]
[13]Wang Xiang,Zhang Min,Liu Yuhua.Compositions and geo-chemical characteristics of light hydrocarbons in northernslope of Tazhong[J].Natural Gas Geoscience,2008,19(5):713-717.[王祥,张敏,刘玉华.塔中北斜坡原油轻烃组成及地球化学特征[J].天然气地球科学,2008,19(5):713-717.]
[14]Van Graas G W,Gilje A E,Isom T P,et al.The effects of phasefractionation on the composition of oils,condensates and gases[J].Organic Geochemistry,2000,31(12):1419-1439.