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    东海陆架盆地西湖凹陷超压成因机制

    段谟东 叶加仁 吴景富 单超 雷闯

    段谟东, 叶加仁, 吴景富, 单超, 雷闯, 2017. 东海陆架盆地西湖凹陷超压成因机制. 地球科学, 42(1): 119-129. doi: 10.3799/dqkx.2017.009
    引用本文: 段谟东, 叶加仁, 吴景富, 单超, 雷闯, 2017. 东海陆架盆地西湖凹陷超压成因机制. 地球科学, 42(1): 119-129. doi: 10.3799/dqkx.2017.009
    Duan Modong, Ye Jiaren, Wu Jingfu, Shan Chao, Lei Chuang, 2017. Overpressure Formation Mechanism in Xihu Depression of the East China Sea Shelf Basin. Earth Science, 42(1): 119-129. doi: 10.3799/dqkx.2017.009
    Citation: Duan Modong, Ye Jiaren, Wu Jingfu, Shan Chao, Lei Chuang, 2017. Overpressure Formation Mechanism in Xihu Depression of the East China Sea Shelf Basin. Earth Science, 42(1): 119-129. doi: 10.3799/dqkx.2017.009

    东海陆架盆地西湖凹陷超压成因机制

    doi: 10.3799/dqkx.2017.009
    基金项目: 

    国家“十二五”重大油气专项 No.2011ZX05023-004-010

    详细信息
      作者简介:

      段谟东(1990-),男,博士研究生,主要从事油气成藏压力预测、岩土工程的研究工作.ORCID:0000-0002-8575-1318.E-mail: 376830199@qq.com

      通讯作者:

      叶加仁,ORCID:0000-0001-5699-8074.E-mail: jrye@cug.edu.cn

    • 中图分类号: P618.13

    Overpressure Formation Mechanism in Xihu Depression of the East China Sea Shelf Basin

    • 摘要: 西湖凹陷超压普遍发育,成因机制复杂,目前研究未见深入.从产生超压的主要因素入手,采用定性分析与定量计算相结合的方法,基于超压层段的测井响应特征、速度与垂直有效应力、沉积速率与孔隙度演化史、压力演化史与生烃强度史耦合的初步判断,再通过定量的计算综合分析了西湖凹陷超压的成因机制.研究表明:不均衡压实作用和生烃作用是西湖凹陷超压形成的主要机制,但在不同的区带有一定的差异.其中保俶斜坡带以不均衡压实作用为主,经过估算生烃作用贡献率为23%~57%,平均达到41%;而在中央背斜带超压形成机制有两种模式,大部分是以生烃作用为主的增压模式,贡献率为51%~78%;个别井位研究显示以不均衡压实作用为主的增压模式.在三潭深凹超压的形成中,不均衡压实作用与生烃作用相当,生烃作用增压稍强于不均衡压实作用增压,生烃作用的平均贡献率为60%左右.

       

    • 图  1  西湖凹陷位置及构造单元划分

      a.东海陆架盆地;b.西湖横剖面;c.本文工区图

      Fig.  1.  The division of tectonic units in Xihu depression

      图  2  西湖凹陷代表性单井泥岩电性与超压分布

      a.超压成因机制识别模式;b.保俶斜坡带T井;c.三潭深凹W井;d.中央背斜带J井

      Fig.  2.  The mudstone electrical and overpressure distribution of representative well in Xihu depression

      图  3  垂直有效应力与声波速度交会

      Fig.  3.  Profiles of the vertical effective stress versus sonic velocity

      图  4  保俶斜坡带、中央背斜带代表性单井和三潭深凹J井的沉积速率史(a1、b1和c1)及其与花港组、平湖组孔隙度演化史(a2、b2和c2)

      a1和a2.保俶斜坡带H井;b1和b2.中央背斜带P井;c1和c2.三潭深凹J井

      Fig.  4.  The history of deposition rate(a1,b1 and c1)and porosity evolution history(a2,b2 and c2)of Huagang and Pinghu Formation in Baochu slope belt,Central anticlinal belt and Santan sag

      图  5  西湖凹陷Line 1测线二维压力演化史

      a.44.0Ma;b.37.0Ma;c.29.1Ma;d.23.3Ma;e.16.2Ma;f.7.0Ma;g.5.2Ma;h.现今

      Fig.  5.  Profiles of the history of 2D excess pressure evolution at Line 1 in Xihu depression

      图  6  B井(a)、T井(b)、O井(c)和J井(d)的剩余压力演化史与生烃强度关系

      Fig.  6.  The relationship between the evolution history of excess pressure and hydrocarbon generation rate on B well(a),T well(b),O well(c)and J well(d)

      表  1  西湖凹陷钻井泥岩超压成因分析统计

      Table  1.   Statistics of the drilling mudstone overpressure formation in Xihu depression

      构造单元井号超压带顶(m)层位推测成因
      保俶斜坡带I井3200平上段不均衡压实+生烃作用
      G井3000花上段不均衡压实+生烃作用
      A井3300平上段不均衡压实+生烃作用
      D井3800平中段不均衡压实
      三潭深凹M井3750花下段不均衡压实+生烃作用
      中央背斜带T井3450平上段生烃作用
      S井3100花下段生烃作用
      R井3100平下段不均衡压实+生烃作用
      P井2850花下段生烃作用+不均衡压实
      Q井3100花下段不均衡压实+生烃作用
      N井2950花下段不均衡压实+生烃作用
      下载: 导出CSV

      表  2  西湖凹陷代表井增压机制估算结果

      Table  2.   The estimation of overpressure mechanisms of typical wells in Xihu depression

      井号测点深度(m)地层压力(MPa)压力系数剩余压力(MPa)垂直有效应力(MPa)声波速度(km/s)有效应力减小量(MPa)泥岩剩余压力(MPa)生烃作用贡献率(%)增压之和与实测剩余压力间的误差(MPa)
      保俶斜坡带A井4280.5073.531.7230.7222.153.8812.6019.7041.011.58
      A井4148.5073.821.7832.3418.913.8215.9719.4049.383.03
      B井3620.7555.581.5319.3725.403.685.8413.9030.140.37
      B井3575.7552.61.4716.8427.053.234.0412.7023.99-0.10
      C井3855.2351.731.3413.1834.923.774.249.1732.170.23
      C井4184.0057.821.3815.9836.213.684.759.5029.72-1.73
      E井3804.0053.381.4015.3430.173.023.6211.4023.59-0.32
      H井3802.8945.721.207.6738.433.294.403.9957.360.72
      中央背斜带O井4182.0051.441.239.6242.824.484.912.3351.03-2.37
      O井4287.7952.551.229.6744.104.317.542.4877.970.35
      O井4390.0053.751.229.8545.204.785.112.9651.87-1.78
      P井3359.7049.491.4715.8927.453.643.2512.1020.44-0.54
      J井3971.7058.2714.7018.5527.074.4510.564.4756.92-3.52
      三潭L井4619.5072.671.5726.4836.912.2315.5810.5058.83-0.40
      K井4144.7662.541.5121.0933.742.5214.798.8565.122.55
      下载: 导出CSV
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    • 收稿日期:  2016-06-06
    • 刊出日期:  2017-01-15

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