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    Melut盆地富含CO2油气藏的成因及期次

    李威 窦立荣 文志刚 张光亚 程顶胜

    李威, 窦立荣, 文志刚, 张光亚, 程顶胜, 2022. Melut盆地富含CO2油气藏的成因及期次. 地球科学, 47(4): 1459-1469. doi: 10.3799/dqkx.2018.539
    引用本文: 李威, 窦立荣, 文志刚, 张光亚, 程顶胜, 2022. Melut盆地富含CO2油气藏的成因及期次. 地球科学, 47(4): 1459-1469. doi: 10.3799/dqkx.2018.539
    Li Wei, Dou Lirong, Wen Zhigang, Zhang Guangya, Cheng Dingsheng, 2022. Genetic Origin of CO2-Rich Oil Reservoirs and Pool-Forming Period in Melut Basin, Southern Sudan. Earth Science, 47(4): 1459-1469. doi: 10.3799/dqkx.2018.539
    Citation: Li Wei, Dou Lirong, Wen Zhigang, Zhang Guangya, Cheng Dingsheng, 2022. Genetic Origin of CO2-Rich Oil Reservoirs and Pool-Forming Period in Melut Basin, Southern Sudan. Earth Science, 47(4): 1459-1469. doi: 10.3799/dqkx.2018.539

    Melut盆地富含CO2油气藏的成因及期次

    doi: 10.3799/dqkx.2018.539
    基金项目: 

    国家油气重大专项项目 2011ZX05029

    中国石油天然气股份有限公司科技专项 2013D-0902

    详细信息
      作者简介:

      李威(1988-),男,工程师,从事油气藏形成与分布方面的研究工作.ORCID:0000-0002-1173-2675.E-mail:liwei173@cnooc.com.cn

      通讯作者:

      窦立荣,E-mail:doulirong@cnpcint.com

    • 中图分类号: P618; TE122

    Genetic Origin of CO2-Rich Oil Reservoirs and Pool-Forming Period in Melut Basin, Southern Sudan

    • 摘要: Palogue油田的发现打开了Melut盆地古近系勘探新方向,证实了北部凹陷为富油气凹陷.Palogue油田具有以下白垩统为主力烃源岩,古近系为主力成藏组合的跨时代运聚风格,幔源CO2气体对油气的聚集和改造具有不可忽略的作用.通过对CO2气体、原油特征、生标特征、包裹体特征进行研究,结合地层埋藏史,分析油气特征及成藏期次.结果表明:Palogue油田具有两期成藏的特征,古近纪中期发生第1期油气成藏事件,随后原油被降解;古近纪晚期-新近纪以来,伴随幔源CO2气体油气发生第2次运移充注事件,且CO2气体对油藏进行了强烈的气洗作用.

       

    • 图  1  Melut盆地构造单元划分及地层综合柱状图

      Fig.  1.  Classification of structural units and strata column of Melut basin

      图  2  Melut盆地Palogue油田剖面(剖面位置见图 1

      Fig.  2.  Oil reservoir cross section of the Palogue structural belt, Melut basin

      图  3  Palogue油田原油地球化学成因判别图

      Fig.  3.  Crude oil geochemical genesis discriminant diagrams in Palogue oilfield

      图  4  Palogue油气田储层流体组分组成

      Fig.  4.  Ternary diagram showing fluid components of reservoirs in Palogue oilfield

      图  5  Palogue油气田原油次生变化识别

      Fig.  5.  Dentification of secondary changes in crude oil in Palogue oilfield

      图  6  Palogue油田原油Pr/Ph、ααα-20RC27/C29与含蜡量的关系

      Fig.  6.  Diagram of Pr/Ph, ααα-20RC27/C29 and wax content of crude oil in Palogue oilfield

      图  7  原油中正构烷烃和25-降藿烷分布

      Fig.  7.  The distribution of alkanes and 25-norhopane in crude oil

      图  8  Palogue油田原油成熟度分布

      Fig.  8.  The maturity profile of crude oil in Palogue oilfield

      图  9  Palogue油田砂岩显微荧光照片

      a.颗粒边缘发棕褐色光,粒间发蓝白色光;b.粒间孔隙受烃类浸染,发蓝白色光,发光强度中

      Fig.  9.  Micrograghs of fluid inclusion in sandstone of Palogue oilfield

      图  10  Palogue油田埋藏热演化史及油气充注期次

      Fig.  10.  Burial-thermal history and oil accumulation stages of Palogue oilfield

      表  1  F-2井Yabus组砂岩样品烃类包裹体测试

      Table  1.   Hydrocarbon inclusion test of sandstone sample in Yabus Group of Well F-2

      类型 气液比(%) 分布特征 气相颜色 液相颜色 均一温度(℃)
      次生 6 石英加大边群体分布 浅褐色 无色 77.8
      6 石英中群体分布 浅褐色 无色 71.8
      8 石英中群体分布 无色 无色 235
      10 石英边部零星分布 浅褐色 无色 73.6
      6 石英愈合缝中 浅褐色 无色 89.7
      8 石英中群体分布 无色 无色 220
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