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准噶尔盆地三叠系百口泉组砂砾岩细观变形破坏数值模拟

黄刘科 刘睿 何睿 马俊修 谭鹏 王灿

黄刘科, 刘睿, 何睿, 马俊修, 谭鹏, 王灿. 准噶尔盆地三叠系百口泉组砂砾岩细观变形破坏数值模拟[J]. 石油实验地质, 2024, 46(4): 833-844. doi: 10.11781/sysydz202404833
引用本文: 黄刘科, 刘睿, 何睿, 马俊修, 谭鹏, 王灿. 准噶尔盆地三叠系百口泉组砂砾岩细观变形破坏数值模拟[J]. 石油实验地质, 2024, 46(4): 833-844. doi: 10.11781/sysydz202404833
HUANG Liuke, LIU Rui, HE Rui, MA Junxiu, TAN Peng, WANG Can. Numerical simulation of mesoscopic deformation and failure for glutenite in Triassic Baikouquan Formation, Junggar Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(4): 833-844. doi: 10.11781/sysydz202404833
Citation: HUANG Liuke, LIU Rui, HE Rui, MA Junxiu, TAN Peng, WANG Can. Numerical simulation of mesoscopic deformation and failure for glutenite in Triassic Baikouquan Formation, Junggar Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(4): 833-844. doi: 10.11781/sysydz202404833

准噶尔盆地三叠系百口泉组砂砾岩细观变形破坏数值模拟

doi: 10.11781/sysydz202404833
基金项目: 

国家自然科学基金 42372337

国家自然科学基金 52234003

西南石油大学自然科学“启航计划”项目 2022QHZ009

详细信息
    作者简介:

    黄刘科(1989—), 男, 博士, 副研究员, 主要从事深部裂隙岩体多场耦合研究。E-mail: swpuhlk@126.com

    通讯作者:

    谭鹏(1990—), 男, 博士, 主要从事非常规油气藏工程地质一体化方面的科研工作。E-mail: tanpeng09jy@163.com

  • 中图分类号: TE122.2

Numerical simulation of mesoscopic deformation and failure for glutenite in Triassic Baikouquan Formation, Junggar Basin

  • 摘要: 我国西部准噶尔盆地三叠系百口泉组砂砾岩致密油资源丰富。因砂砾岩储层中含有众多成分及强度大小不一的砾石,导致砂砾岩力学特征受砾石的形状、尺寸及物性影响较大,进而影响砂砾岩油藏的压裂裂缝复杂程度和压裂改造效果。鉴于此,针对准噶尔盆地百口泉组砂砾岩储层特征,建立了随机不规则多边形砾石的生成方法,并基于颗粒离散元法建立了砂砾岩力学数值模型,研究了典型砾石含量和分布对砂砾岩细观力学特征的影响机理。砂砾岩变形破坏数值模拟结果表明:低强度砾石对裂缝延伸的屏蔽作用较弱,裂缝大多呈“穿砾”模式,而高强度砾石对裂缝的屏蔽作用较强,裂缝更多呈“绕砾”模式;围压增加,岩石抗压强度明显增加,峰值应变能及滑移能也呈线性增加,且应变能增长显著;含不同砾石组合的砂砾岩储层中,剪切微裂缝数量随围压的增加而增加,且具有线性特征关系,高围压下含高强度砾石的砂砾岩具有更显著的塑性及延性特征,且存在明显的二次破坏现象;随低强度砾石的减少或高强度砾石的增加,砂砾岩的弹性模量增大,且抵抗变形能力增强,而不同砾石组合情况下,围压对砂砾岩弹性模量的影响较小;砂砾岩宏观破坏带的形成发育过程很大程度受控于内部细观结构,且受围压、砾石类型(力学强度)等的影响较大。

     

  • 图  1  随机多边形砾石的几何形状示意

    Figure  1.  Geometry diagram of random polygonal gravel

    图  2  准噶尔盆地三叠系百口泉组砂砾岩照片

    Figure  2.  Photograph of glutenite from Triassic Baikouquan Formation, Junggar Basin

    图  3  准噶尔盆地三叠系百口泉组砂砾岩三轴(围压40 MPa)压缩模拟结果

    Figure  3.  Simulation results of glutenite triaxial compression (confining pressure 40 MPa) in Triassic Baikouquan Formation, Junggar Basin

    图  4  不同围压下砂砾岩三轴压缩破坏形态

    Figure  4.  Triaxial compression failure patterns of glutenite under different confining pressures

    图  5  不同围压微裂缝数量及能量曲线的演化过程

    Figure  5.  Evolution of number and energy curves of microcracks under different confining pressures

    图  6  不同围压砂砾岩轴向压缩模拟结果对比

    Figure  6.  Comparison of axial compression simulation results of glutenite under different confining pressures

    图  7  不同围压下不同砾石比例砂砾岩三轴压缩破坏形态

    Figure  7.  Failure patterns of glutenite with different gravel ratios under different confining pressures in triaxial compression

    图  8  不同围压下不同砾石比例砂砾岩三轴压缩微裂缝数量及能量曲线

    Figure  8.  Number and energy curves of glutenite with different gravel ratios under different confining pressures in triaxial compression

    图  9  不同砾石比例砂砾岩轴向压缩模拟结果对比

    Figure  9.  Comparison of axial compression simulation results of gravel conglomerate with different gravel ratios

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  • 收稿日期:  2024-02-29
  • 修回日期:  2024-06-12
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