天然气地球科学 ›› 2021, Vol. 32 ›› Issue (9): 1384–1392.doi: 10.11764/j.issn.1672-1926.2021.04.004

• 天然气地球化学 • 上一篇    下一篇

准噶尔盆地莫索湾地区白垩系生物降解与成藏地球化学特征

李二庭1,2(),米巨磊1,2,周波1,2,马聪1,2,陈世加3,张晓刚1,2,刘翠敏1,2   

  1. 1.新疆砾岩油藏实验室,新疆 克拉玛依 834000
    2.中国石油新疆油田分公司实验检测研究院,新疆 克拉玛依 834000
    3.西南石油大学,四川 成都 610500
  • 收稿日期:2021-01-26 修回日期:2021-03-30 出版日期:2021-09-10 发布日期:2021-09-14
  • 作者简介:李二庭(1988-),男,安徽宿州人,高级工程师,博士,主要从事油气地球化学研究.E-mail:lierting@petrochina.com.cn.
  • 基金资助:
    中国石油重大工程技术现场试验项目“准噶尔南缘和玛湖等重点地区优快钻完井技术集成与试验”(2019F-33)

Biodegradation and geochemical conditions for hydrocarbon accumulation of Cretaceous reservoir in Mosuowan area of Junggar Basin

Erting LI1,2(),Julei MI1,2,Bo ZHOU1,2,Cong MA1,2,Shijia CHEN3,Xiaogang ZHANG1,2,Cuimin LIU1,2   

  1. 1.Xinjiang Laboratory of Petroleum Reserve in Conglomerate,Karamay 834000,China
    2.Research Institute of Experiment and Testing,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China
    3.Resource and Environmental Engineering College,Southwest Petroleum University,Chengdu 610500,China
  • Received:2021-01-26 Revised:2021-03-30 Online:2021-09-10 Published:2021-09-14
  • Supported by:
    The Major Engineering Technology Field Test Project of CNPC(2019F-33)

摘要:

通过分析准噶尔盆地莫索湾地区白垩系油藏原油25?降藿烷含量、烃类包裹体的均一温度及组分特征、地层埋藏史及热演化史,探讨了研究区生物降解分布、地点及时间,结合生物降解与未降解原油混合实验,揭示了不同期次油藏保存规模。结果表明:准噶尔盆地莫索湾地区白垩系普遍存在生物降解,纵向上生物降解受白垩系底部不整合面控制,导致垂向分布存在差异。油气存在2期成藏,早期成藏从早白垩世开始充注,并发生严重的本地生物降解,降解时间为早白垩世末—晚白垩世早期,受烃源岩排烃规模限制,第一期成藏油气规模小,对后期聚集的主成藏期油气破坏较小;第二期成藏为主成藏期,成藏时间对应下乌尔禾组大规模排烃期,即晚白垩世。

关键词: 白垩系, 生物降解, 成藏, 包裹体, 25?降藿烷, 准噶尔盆地

Abstract:

Content of 25-norhopane, homogenization temperature and composition of fluid inclusions, stratigraphic burial-thermal history and characteristic of rock fluorescence are analyzed. Distribution, location and time of biodegradation of Cretaceous reservoir in Mosuowan area of Junggar Basin were discussed. Combined with biodegradable and undegraded crude oil mixing experiment, the scale of sub-reservoir preservation in different periods was revealed. The results show that there is widespread biodegradation in Cretaceous reservoir in Mosuowan area of Junggar Basin, and vertical distribution of biodegradation is controlled by unconformity at the bottom of Cretaceous reservoir. There are two stages of oil accumulation in Cretaceous reservoir. Early accumulation began in Early Cretaceous, accompanied by severe local biodegradation. The degradation time was from the end of Early Cretaceous to the early of Late Cretaceous. However, due to limitation of the scale of hydrocarbon expulsion from source rocks, first stage of oil accumulation is small, resulting in a small impact of biodegradation on later oil accumulation. Second stage of accumulation is the main accumulation period, and accumulation time corresponds to large-scale hydrocarbon expulsion period of source rocks of the lower Wuerhe Formation, that is, during Late Cretaceous.

Key words: Cretaceous, Biodegradation, Accumulation, Inclusions, 25-norhopane, Junggar Basin

中图分类号: 

  • TE122.1+13

图1

准噶尔盆地腹部地区油气田及井位分布"

图2

准噶尔盆地腹部不同深度原油25-降藿烷/C29藿烷特征交会图"

图3

准噶尔盆地腹部陆29井白垩系储层自由态组分、束缚态组分和包裹体组分质谱"

图4

准噶尔盆地莫索湾地区储层流体包裹体均一温度分布"

表1

准噶尔盆地莫索湾地区白垩系储层流体包裹体单井均一温度特征"

井号均一温度/℃均一温度均值/℃
盆参271~85,90~9778,94
盆467~84,85~11475,104
盆562.5~68,103.2~11265,107.5
莫395.5~97.2,112.5~118.996.4,115.7

图5

准噶尔盆地盆1井西凹陷二叠系烃源岩生烃演化史"

图6

准噶尔盆地莫索湾地区未降解原油与生物降解原油混合实验中25-降藿烷/C29藿烷特征"

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