| 渤中坳陷BZ26-2油田油气地球化学特征及其成藏意义 |
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| 引用本文： | 陈斌,郝芳,邹华耀.渤中坳陷BZ26-2油田油气地球化学特征及其成藏意义[J].西安石油大学学报(自然科学版),2006,21(6):1-4. |
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| 作者姓名： | 陈斌 郝芳 邹华耀 |
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| 作者单位： | 中国石油大学(北京)石油天然气成藏机理教育部重点实验室,北京,102249;中国石油大学(北京)资源与信息学院,北京,102249 |
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| 基金项目： | 国家自然科学基金;中国石油天然气集团公司资助项目 |
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| 摘 要： | 渤中坳陷BZ26-2油田发现正常油藏和凝析气藏两类油气藏.馆陶组原油中25-降霍烷系列与完整的链烷烃系列共存表明至少存在两期油气成藏.通过原油单体烃碳同位素和生物标志化合物的对比表明,油田具有双向油气来源,凝析油气来源于北部渤中凹陷,而正常原油主要来源于南部黄河口凹陷.原油异常密度梯度和轻烃参数表明,深层凝析气藏为热成因,浅层凝析气藏为蒸发分馏成因.综合分析表明BZ26-2油田是一个具有双向油气来源、多期次充注、经历多种后生作用的复合成因油气田.
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| 关 键 词： | 渤中坳陷 地球化学特征 多期成藏 生物降解 蒸发分馏作用 |
| 文章编号： | 1673-064X(2006)06-0001-04 |
| 修稿时间： | 2005年12月28 |
Geochemical Character of the hydrocarbon in BZ26-20ilfield,Bozhong Depression and its implication for petroleum accumulation |
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| CHEN Bin,HAO Fang,ZOU Hua-yao.Geochemical Character of the hydrocarbon in BZ26-20ilfield,Bozhong Depression and its implication for petroleum accumulation[J].Journal of Xian Shiyou University,2006,21(6):1-4. |
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| Authors: | CHEN Bin HAO Fang ZOU Hua-yao |
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| Abstract: | Oil and condensate oil & gas reservoirs are found in BZ26-2 Oilfield.25-norhopane series and intact alkenes series coexist in the crude oil of Guantao Formation,which implies that there are two-stage hydrocarbon-fillings at least.The comparison of the carbon isotopes of the crude oil monomers with the biomarkers of the crude oil indicates that the condensate oil & gas in the oilfield comes from northern Bozhong Sag(NBS) but the normal crude oil comes from southern Huanghekou Sag(SHS).By analyzing lighter hydrocarbons parameters and the changes in oil density,it is suggested that the deep condensate gas reservoir is dominated by thermal maturation and the shallow one is formed by evaporative fractionation.Therefore,the BZ26-2 Oilfield is a two-source multi-stage filled composite-genesis oil-gas field. |
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| Keywords: | Bozhong Depression geochemical feature multi-stage petroleum accumulation biodegradation evaporative fractionation |
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