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    准噶尔盆地阜康凹陷侏罗系超压成因、垂向传导及油气成藏

    宫亚军 张奎华 曾治平 秦峰 牛靖靖 范婕 刘慧

    宫亚军, 张奎华, 曾治平, 秦峰, 牛靖靖, 范婕, 刘慧, 2021. 准噶尔盆地阜康凹陷侏罗系超压成因、垂向传导及油气成藏. 地球科学, 46(10): 3588-3600. doi: 10.3799/dqkx.2020.366
    引用本文: 宫亚军, 张奎华, 曾治平, 秦峰, 牛靖靖, 范婕, 刘慧, 2021. 准噶尔盆地阜康凹陷侏罗系超压成因、垂向传导及油气成藏. 地球科学, 46(10): 3588-3600. doi: 10.3799/dqkx.2020.366
    Gong Yajun, Zhang Kuihua, Zeng Zhiping, Qin Feng, Niu Jingjing, Fan Jie, Liu Hui, 2021. Origin of Overpressure, Vertical Transfer and Hydrocarbon Accumulation of Jurassic in Fukang Sag, Junggar Basin. Earth Science, 46(10): 3588-3600. doi: 10.3799/dqkx.2020.366
    Citation: Gong Yajun, Zhang Kuihua, Zeng Zhiping, Qin Feng, Niu Jingjing, Fan Jie, Liu Hui, 2021. Origin of Overpressure, Vertical Transfer and Hydrocarbon Accumulation of Jurassic in Fukang Sag, Junggar Basin. Earth Science, 46(10): 3588-3600. doi: 10.3799/dqkx.2020.366

    准噶尔盆地阜康凹陷侏罗系超压成因、垂向传导及油气成藏

    doi: 10.3799/dqkx.2020.366
    基金项目: 

    国家重大科技攻关项目 2016ZX05002-002

    中国石油化工股份有限公司重点课题 P20062-5

    中国石油化工股份有限公司重点课题 P19016-1

    详细信息
      作者简介:

      宫亚军(1984-), 男, 副研究员, 硕士, 主要从事区域油气成藏研究.ORCID: 0000-0003-4505-5358.E-mail: 278365907@qq.com

    • 中图分类号: P624

    Origin of Overpressure, Vertical Transfer and Hydrocarbon Accumulation of Jurassic in Fukang Sag, Junggar Basin

    • 摘要: 沉积盆地中超压广受关注,但对超压传导规律认识的不足制约了高压领域的油气勘探.以准噶尔盆地阜康凹陷侏罗系为例,通过超压类型地质综合判识、关键超压表征参数的理论计算及流体包裹体压力恢复,首次认识到了垂向传导对于储集层超压的重要贡献,结合压力垂向传导机制及过程,探讨了油气藏的运聚及泄露意义.研究结果表明,侏罗系超压由4类超压环境中7种致压因素引起,经历2期大规模压力跨层垂向传导,储集层段发育以垂向传导为主因的复合超压,形成3类不同动力特征的油气藏.压力垂向传导是储集层超压的主要成因机制,断-盖的力学性质、差应力及流体压力等3类因素控制压力垂向传导,传导背景下,形成3类与传导作用有关的油气藏:受断层垂向传导控制的超压油藏、受连通砂体侧向传导控制的超压油藏以及超压界面上的常压油藏,上述3类油气藏的运聚及泄露特征差异较大.

       

    • 图  1  阜康凹陷构造图(J2t底)及侏罗系岩性柱状图

      Fig.  1.  Regional structural map and strata histogram of Fukang sag

      图  2  阜康凹陷侏罗系地层压力特征

      Fig.  2.  Characteristics of the Jurassic pressure in Fukang sag

      图  3  阜康凹陷中心侏罗系超压段孔隙度、渗透率与镜质体反射率特征

      Fig.  3.  The measured pressure coefficient with porosity and vitrinite reflectance in Fukang sag

      图  4  阜康凹陷侏罗系储层超压段地质特征

      Fig.  4.  Geological characteristics of the non-source rock overpressure section in the center Fukang sag

      图  5  阜康凹陷董701井侏罗系声速-有效应力-密度关系

      Fig.  5.  Relationship between acoustic velocity, effective stress and density of well Dong701

      图  6  阜康凹陷J2t (a)和J1s (b) 的压力演化

      Fig.  6.  The pressure evolution model for the Jurassic in Fukang sag

      图  7  不同差应力条件下断层再活化与地层流体压力关系

      τ为剪应力,MPa;Sn为剪应力,MPa;TC为抗张强度,MPa;①静水压力;②超压-Pp;③超压+构造应力

      Fig.  7.  Relationship between fault reactivation and fluid pressure under differential stress in Fukang sag

      图  8  阜康凹陷不同压力条件下油气藏的保存与泄露特征

      Fig.  8.  Characteristics of reservoir preservation and leakage under different dynamic conditions in Fukang sag

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