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    琼东南盆地水合物富集区储层特征及勘探启示

    樊奇 朱振宇 庞维新 李清平 周松望 李元平

    樊奇, 朱振宇, 庞维新, 李清平, 周松望, 李元平, 2024. 琼东南盆地水合物富集区储层特征及勘探启示. 地球科学, 49(4): 1421-1430. doi: 10.3799/dqkx.2023.123
    引用本文: 樊奇, 朱振宇, 庞维新, 李清平, 周松望, 李元平, 2024. 琼东南盆地水合物富集区储层特征及勘探启示. 地球科学, 49(4): 1421-1430. doi: 10.3799/dqkx.2023.123
    Fan Qi, Zhu Zhenyu, Pang Weixin, Li Qingping, Zhou Songwang, Li Yuanping, 2024. Reservoir Characteristics and Exploration Implications of Gas Hydrate Enrichment Area, Qiongdongnan Basin. Earth Science, 49(4): 1421-1430. doi: 10.3799/dqkx.2023.123
    Citation: Fan Qi, Zhu Zhenyu, Pang Weixin, Li Qingping, Zhou Songwang, Li Yuanping, 2024. Reservoir Characteristics and Exploration Implications of Gas Hydrate Enrichment Area, Qiongdongnan Basin. Earth Science, 49(4): 1421-1430. doi: 10.3799/dqkx.2023.123

    琼东南盆地水合物富集区储层特征及勘探启示

    doi: 10.3799/dqkx.2023.123
    基金项目: 

    国家自然科学基金企业联合基金 U19B2005

    国家自然科学基金企业联合基金 U20B6005

    中国海油重点实验室主任基金 2024—2025

    国家重点研发计划 2021YFC2800900

    中国工程科技发展战略课题 21-HN-ZD024

    详细信息
      作者简介:

      樊奇(1990-),男,高级工程师,博士,主要从事水合物和油气资源评价、烃源岩相关研究.ORCID:0000-0002-5490-4377. E-mail:fanqi@cnooc.com.cn

    • 中图分类号: P67

    Reservoir Characteristics and Exploration Implications of Gas Hydrate Enrichment Area, Qiongdongnan Basin

    • 摘要: 天然气水合物是海洋新能源的重要开拓领域,南海琼东南盆地是水合物富集区和热点研究区.为进一步摸清琼东南水合物富集区储层特征,选取国产自主技术装备收获的水合物岩心开展分析并获得第一手资料.通过粒度、岩矿分析(含扫描电镜)、随钻测井、红外热成像、氯离子饱和度法等综合分析,测得储层主要是由石英(含量23%)、斜绿泥石(含量17%)、绢云母(含量15%)、钠长石(含量14%)等组成的硅铝质粘土沉积,储层粒度中值15.1~34.1 μm,饱和度分布3%~54%,揭示了水合物储层“细粒性、未成岩、易溃散、高电阻、高声速、强非均质性”等六大特征;结合气源、储层分析和勘探认识,建立了“异地热成因气充注、本地微生物成因气补充、气烟囱顶部运移聚集、海底扇内横向成藏”的成藏模式,重点对123 mbsf和153 mbsf(mbsf全称为meter below seafloor,表示海底以下深度,以“m”为单位)两件原位保压岩心进行X射线和CT扫描,识别出泥质粉砂孔隙型储层(海底扇横向为主)和南海新发现的水合物储层类型泥质粉砂微裂缝型储层(气烟囱垂向为主)两类主要储层;提出了“以古气候-地质事件为节点关注珠江口-琼东南第四系大型砂体的赋存条件和资源潜力、加强传热传质在水合物成藏机理和资源评价中的研究”勘探启示.研究可为中国南海天然气水合物勘查和试采提供重要科学参考.

       

    • 图  1  研究区位置(红框)及琼东南盆地地层柱状图

      Fig.  1.  Location map (red frame) of study area and stratigraphic column of the Qiongdongnan basin

      图  2  琼东南盆地水合物岩心野外特征

      a.浅表层孔隙型水合物储层样品;b.富集层段点火试验;c.释压储层剖切和块状水合物岩心;d.岩心中的碳酸盐岩介壳及生物化石

      Fig.  2.  Field characteristics of hydrate cores in the Qiongdongnan basin

      图  3  琼东南盆地水合物H1井样品(153 mbsf样品)储层矿物组分和氧化物

      Fig.  3.  Mineral components and main oxide of hydrate samples of Well H1 in the Qiongdongnan basin

      图  4  琼东南盆地水合物富集区H1井重点层段储层岩心扫描电镜

      Fig.  4.  SEM images of representative samples of Well H1 in the Qiongdongnan basin

      图  5  琼东南盆地H1井水合物测井响应特征及综合分析

      Fig.  5.  Logging characteristics and comprehensive analysis of Well H1 in the Qiongdongnan basin

      图  6  琼东南盆地不同类型水合物储层X射线和CT扫描

      a~c.孔隙型储层;d~f.微裂隙型储层

      Fig.  6.  X-ray and CT scanning of coring of different reservoirs in the Qiongdongnan basin

      图  7  琼东南盆地水合物岩心热红外成像现场测试结果

      Fig.  7.  Thermal infrared imaging features of hydrate cores in the Qiongdongnan basin

      图  8  琼东南盆地水合物储层类型分布及成藏模式

      Fig.  8.  Distribution of different hydrate reservoirs and hydrate formation moderns of the Qiongdongnan basin

      表  1  琼东南盆地H1井水合物储层中位粒度

      Table  1.   Median particle size distribution of reservoir samples of Well H1 in the Qiongdongnan basin

      深度(m) 粒度中值(μm)
      0.10 24.856
      0.50 27.641
      0.80 34.112
      0.95 24.600
      11.20 24.760
      12.30 21.312
      27.20 15.055
      87.20 16.710
      100.70 17.946
      123.00 30.642
      127.20 27.784
      129.70 28.944
      137.20 21.804
      153.00 15.962
      172.00 25.555
      下载: 导出CSV

      表  2  琼东南盆地水合物样品饱和度估算结果

      Table  2.   Saturation estimation results of hydrate reservoir in the Qiongdongnan basin

      样品号 取样深度(m) 氯离子浓度(104 mg/L) 电导率(ms/cm) 氯离子估算饱和度(%)
      1 11.2 1.66 58.63 18.10
      2 27.2 1.49 53.82 27.16
      3 67.2 1.85 53.20 7.30
      4 87.2 1.76 52.42 12.35
      5 97.2 1.98 51.00 饱和度基准
      6 100.7 3.43 68.19 饱和度基准
      7 123 2.28 38.28 37.25
      8 129.7 2.82 39.67 19.76
      9 137.2 3.08 62.3 11.34
      10 153 1.74 82.86 54.75
      注:氯离子浓度计算公式为S=(1-Clpw/Clsw)/ρh,其中ρh指天然气水合物密度,Clpw指实测氯离子浓度,Clsw指基线氯离子浓度.
      下载: 导出CSV
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    • 收稿日期:  2022-12-27
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