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    临南洼陷沙三段异常地层压力及其演化特征

    李纯泉 刘惠民

    李纯泉, 刘惠民, 2013. 临南洼陷沙三段异常地层压力及其演化特征. 地球科学, 38(1): 105-111. doi: 10.3799/dqkx.2013.010
    引用本文: 李纯泉, 刘惠民, 2013. 临南洼陷沙三段异常地层压力及其演化特征. 地球科学, 38(1): 105-111. doi: 10.3799/dqkx.2013.010
    LI Chun-quan, LIU Hui-min, 2013. Abnormal Formation Pressure and Its Evolution Features of the Third Member, Shahejie Formation, Linnan Sag. Earth Science, 38(1): 105-111. doi: 10.3799/dqkx.2013.010
    Citation: LI Chun-quan, LIU Hui-min, 2013. Abnormal Formation Pressure and Its Evolution Features of the Third Member, Shahejie Formation, Linnan Sag. Earth Science, 38(1): 105-111. doi: 10.3799/dqkx.2013.010

    临南洼陷沙三段异常地层压力及其演化特征

    doi: 10.3799/dqkx.2013.010
    基金项目: 

    国家自然科学基金项目 40702022

    中国地质大学(武汉)中央高校基本科研业务费专项资金资助项目 CUGL090211

    "构造与油气资源"教育部重点实验室开放课题项目 TPR-2011-19

    详细信息
      作者简介:

      李纯泉(1974-), 男, 副教授, 主要从事油气地质方面的教学和科研工作.E-mail: tiger_lcq@163.com

    • 中图分类号: P618

    Abnormal Formation Pressure and Its Evolution Features of the Third Member, Shahejie Formation, Linnan Sag

    • 摘要: 异常地层压力的演化历史对深入理解油气的生、运、聚动力学过程至关重要.为揭示临南洼陷内异常地层压力的演化特征, 在流体包裹体组合概念的限定下, 利用热动力学模拟的方法, 对沙三段进行了地层古压力重建.地层压力系数随时间的演化表明, 沙三中、下亚段在30 Ma左右即发育有异常高压, 而现今洼陷内局部发育的异常低压为异常高压经过一定时期的演化后在晚期形成, 自30 Ma以来的整个演化过程表现出降压-增压-降压的旋回性特征.沙三上亚段在该地质历史时期均未发育异常高压, 但晚期也表现出明显的降压特征.结合生烃史、充注史及断裂活动性综合分析表明, 临南洼陷沙三段异常高压主要起源并受控于油气的生成与充注, 而异常低压主要起源并受控于断裂的多次、长期活动.

       

    • 图  1  临南洼陷构造位置及生储盖组合

      Fig.  1.  Structural location and assemblages of source rocks, reservoir rocks, and cap rocks of Linnan sag

      图  2  临南洼陷沙三段现今实测地层压力及压力系数与深度关系

      Fig.  2.  Relations of currently tested formation pressures and pressure coefficients to the depth in the third member, Shahejie formation, Linnan sag

      图  3  街202井沙三中亚段一流体包裹体组合显微测温及古流体压力热动力学模拟结果

      a.透射光下一个流体包裹体组合的显微照片;b.紫外光下a中流体包裹体组合的显微(荧光)照片;c.a中流体包裹体组合的各包裹体显微测温数据;d.a中流体包裹体组合的热动力学模拟结果

      Fig.  3.  Results of microthermometry and thermodynamic modeling of palaeo pressure with a fluid inclusion assemblage in Es3z formation of well Jie202

      图  4  临南洼陷沙三段各亚段地层压力系数随时间演化

      空心点为油包裹体数据,实心点为含烃盐水包裹体数据

      Fig.  4.  Evolution of pressure coefficients with time in each section of the third member, Shahejie formation, Linnan sag

      图  5  临南洼陷夏941井生烃史及充注史

      Fig.  5.  Hydrocarbon generation and charge history of well Xia941 in Linnan sag

      图  6  临南洼陷沙三上亚段实测地层压力系数与断裂分布关系

      Fig.  6.  Relation of the tested formation pressure coefficients to the fault distribution in the upper section of the third member, Shahejie formation, Linnan sag

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