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    巴西桑托斯盆地CO2区域分布及主控因素

    赵健 赵俊峰 任康绪 王童奎 许必锋

    赵健, 赵俊峰, 任康绪, 王童奎, 许必锋, 2021. 巴西桑托斯盆地CO2区域分布及主控因素. 地球科学, 46(9): 3217-3229. doi: 10.3799/dqkx.2020.359
    引用本文: 赵健, 赵俊峰, 任康绪, 王童奎, 许必锋, 2021. 巴西桑托斯盆地CO2区域分布及主控因素. 地球科学, 46(9): 3217-3229. doi: 10.3799/dqkx.2020.359
    Zhao Jian, Zhao Junfeng, Ren Kangxu, Wang Tongkui, Xu Bifeng, 2021. Distribution and Main Controlling Factors of CO2 in Santos Basin, Brazil. Earth Science, 46(9): 3217-3229. doi: 10.3799/dqkx.2020.359
    Citation: Zhao Jian, Zhao Junfeng, Ren Kangxu, Wang Tongkui, Xu Bifeng, 2021. Distribution and Main Controlling Factors of CO2 in Santos Basin, Brazil. Earth Science, 46(9): 3217-3229. doi: 10.3799/dqkx.2020.359

    巴西桑托斯盆地CO2区域分布及主控因素

    doi: 10.3799/dqkx.2020.359
    基金项目: 

    国家科技重大专项 2016ZX05029005

    详细信息
      作者简介:

      赵健(1982-), 男, 高级工程师, 主要从事海外油气勘探与石油地质综合研究工作, ORCID: 0000-0002-6323-6526.E-mail: Zhaojian@cnpcint.com

    • 中图分类号: P618.13

    Distribution and Main Controlling Factors of CO2 in Santos Basin, Brazil

    • 摘要: 桑托斯盆地盐下油气田中发现了大量CO2,给油气勘探开发和生产都带来诸多困难和挑战.利用地层测试、样品分析及文献资料等,明确了CO2成因及来源,统计分析了其区域分布特征,并基于区域重磁和深源地震等资料,剖析了控制CO2分布的地质因素.盆内CO2主要为幔源—岩浆成因,且幔源CO2贡献了至少92%的CO2总量.区域上,CO2自陆向海呈增加趋势,并相对集中在盆地东部隆起带上.地壳减薄和地幔局部隆升是控制CO2宏观分布最重要的背景因素.极端的地壳伸展造成了圣保罗地台下部陆壳强烈拉伸减薄,形成了一个面积约5.1×104 km2的地壳减薄区,造成了富含CO2的地幔物质上拱进入陆壳,宏观上决定了盆内CO2区域分布.此区域之外,出现高含量CO2的可能性大幅降低.岩浆侵入和活动断层都是沟通隆升地幔和浅部储层的重要路径,但以断裂沟通最常见.NW-SE向区域走滑断裂和NE-SW向I-II级正断层对CO2在浅部地层中的分配起控制作用,两组断裂交汇部位或周缘是幔源岩浆或CO2最集中发育区.

       

    • 图  1  桑托斯盆地构造单元划分及综合地层柱状简图

      图a据Sandwell and Smith(2009)编绘; 走滑断裂体系据Cobbold et al.(2001)Meisling et al.(2001)Evain et al.(2015)编绘; 地层柱状图据Moreira et al.(2007)编绘

      Fig.  1.  Structural unit division and integrated stratum column of Santos basin

      图  2  桑托斯盆地CO2同位素特征及幔源CO2含量估算

      a. CO2成因判识图,据Dai et al.(1996);b.幔源CO2含量估算图,据Santos et al.(2012)

      Fig.  2.  Carbon isotope of CO2 and mantle derived CO2 content estimation

      图  3  桑托斯盆地CO2分布及盆地深部地壳结构简图

      区块分布据http://rodadas.anp.gov.br/arquivos/Bienio/Mapas_LP7-8/R7_R8_LP_GERAL.pdf

      Fig.  3.  Sketch map of CO2 distribution and deep crustal structure in Santos basin

      图  4  Jp构造及周缘预测岩浆体与CO2分布对应关系

      Gamboa et al.(2019)改编;a. 磁力图一阶导数;b. 剩余布格重力图;c. 二维地质解释模型(位置见图a和b中黄色箭头)

      Fig.  4.  Distribution maps of predicted igneous rocks and CO2 around the Jp structure

      图  5  桑托斯盆地深源地震剖面及深部壳幔结构剖面

      剖面位置见图 3图 5a5d中二维地震剖面底图据Kumar et al.(2012)修编;图 5b5c中San Ba地震剖面底图据Evain et al.(2015)修编,其中白色虚线为Zalán et al.(2011)解释出的基底构造和莫霍顶面

      Fig.  5.  Deep crustal structure profiles from deep-source seismic data in Santos basin

      图  6  桑托斯盆地Lb区块断裂与CO2分布

      区块位置见图 3;图a据Rancan et al.(2018)Zhao et al.(2019);图b为地震速度剖面;图c和d为常规地震剖面,其中c未带解释方案剖面,d为带解释方案剖面;黄色箭头指CO2,黑色箭头为岩浆

      Fig.  6.  Distribution map of faults and CO2 in Lb block

      表  1  Lb区块不同构造位置CO2含量及流体性质统计

      Table  1.   Statistic table of CO2 content and fluid properties in Lb block

      样品位置 取样位置 样品类型 闪蒸气体中CO2(摩尔百分比) 原位地层中CO2(摩尔百分比) 气油比(m3/m3 原油密度(°API)
      样点1 67.16 65.26 3 077.17 36.36
      67.55 65.37 2 834.43 37.67
      67.58 65.51 2 954.30 37.25
      67.32 65.31 2 958.99 37.01
      66.95 64.88 2 931.61 37.57
      样点2 43.40 37.29 436.13 27.28
      43.37 37.25 438.64 27.15
      注:取样位置见图 6c.
      下载: 导出CSV
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    • 收稿日期:  2020-07-26
    • 网络出版日期:  2021-10-14
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