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    被断裂破坏泥岩盖层封闭性演化史恢复方法及其应用

    付广 李世朝

    付广, 李世朝, 2017. 被断裂破坏泥岩盖层封闭性演化史恢复方法及其应用. 地球科学, 42(9): 1590-1598. doi: 10.3799/dqkx.2017.514
    引用本文: 付广, 李世朝, 2017. 被断裂破坏泥岩盖层封闭性演化史恢复方法及其应用. 地球科学, 42(9): 1590-1598. doi: 10.3799/dqkx.2017.514
    Fu Guang, Li Shizhao, 2017. Restoration Method of Closed Evolution History of Fractured Mudstone Cap Rock and Its Application. Earth Science, 42(9): 1590-1598. doi: 10.3799/dqkx.2017.514
    Citation: Fu Guang, Li Shizhao, 2017. Restoration Method of Closed Evolution History of Fractured Mudstone Cap Rock and Its Application. Earth Science, 42(9): 1590-1598. doi: 10.3799/dqkx.2017.514

    被断裂破坏泥岩盖层封闭性演化史恢复方法及其应用

    doi: 10.3799/dqkx.2017.514
    基金项目: 

    国家自然基金项目 No.41372153

    详细信息
      作者简介:

      付广(1962-), 男, 教授, 博士生导师, 现从事油气藏形成与保存研究

    • 中图分类号: P631.8

    Restoration Method of Closed Evolution History of Fractured Mudstone Cap Rock and Its Application

    • 摘要: 前人研究泥岩盖层封闭性时并没有考虑断裂的破坏程度,且对已被断裂破坏泥岩盖层封闭性演化史的研究目前尚未见到文献报道,而这些问题对含油气盆地断裂发育区油气勘探至关重要.在被断裂破坏泥岩盖层封闭机理及其封闭演化特征研究的基础上,通过比较泥岩盖层断接厚度与其封油气所需的最小断接厚度的相对大小,将被断裂破坏泥岩盖层封闭分为未被断裂破坏和已被断裂破坏泥岩盖层封闭2种,并通过泥岩盖层和断层岩古排替压力恢复,确定泥岩盖层封闭能力形成距今时间、断层岩开始压实成岩距今时间和封闭能力形成距今时间,建立了一套被断裂破坏泥岩盖层封闭性演化史的恢复方法,并将其应用于渤海湾盆地南堡5号构造被f2断裂破坏东二段泥岩盖层封闭性演化史的恢复中.结果表明:在L1、L3、L4、L5、L6、L7和L9测线处,f2断裂未破坏东二段泥岩盖层封闭,仍是东二段泥岩盖层封闭,其封闭性演化经历了不封闭和封闭阶段,目前具有较强的封闭能力.在L2和L8测线处f2断裂已破坏了东二段泥岩盖层封闭,为f2断裂断层岩封闭,其封闭能力演化经历了压实不封闭、成岩不封闭和成岩封闭3个阶段,目前也已具较强封闭能力,均有利于油气在东二段泥岩盖层之下储层中聚集与保存.与目前东二段泥岩盖层之下储层中已发现油气分布相吻合,表明该方法用于恢复被断裂破坏泥岩盖层封闭性演化史是可行的.

       

    • 图  1  被断裂破坏泥岩盖层封闭性演化示意图

      a.未被断裂破坏;b.已被断裂破坏;图a中, Tcm.断裂形成封闭能力距今时间;① 泥岩盖层不封闭阶段;② 泥岩封闭阶段;图b中,T0.断裂停止活动距今时间;Tb.断层岩开始压实成岩距今时间;Tc.断层岩形成封闭能力距今时间;① 断层岩压实不封闭阶段;② 断层岩成岩不封闭阶段;③ 断层岩成岩封闭阶段

      Fig.  1.  Schematic of closed evolution of fractured mudstone cap rock

      图  2  南堡5号构造f2断裂分布

      Fig.  2.  Plane distribution of fault f2 in 5th Structure of Nanpu sag

      图  3  南堡5号构造f2断裂的油藏剖面

      Fig.  3.  Section of reservoirs among fault f2 in 5th structure of Nanpu sag

      图  4  南堡凹陷东二段泥岩盖层封油气所需的最小断接厚度厘定

      Fig.  4.  The determination of minimum faulted thickness of Ed2 mudstone caprock in Nanpu sag

      图  5  南堡5号构造被f2断裂破坏泥岩盖层封闭性演化曲线

      Fig.  5.  The closed evolution curve of the mudstone cap rock of No.5 structure was destroyed by fault f2 of Nanpu sag

      图  6  南堡凹陷围岩孔隙度随埋深变化关系

      Fig.  6.  Relation of porosity and burial depth of surrounding rocks in Nanpu sag

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    • 收稿日期:  2016-12-12
    • 刊出日期:  2017-09-15

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