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渗流-应力耦合作用对储层裂缝发育的影响研究

宋子怡 王昊 李静 孙鲁宁 张加太 刘晨

宋子怡, 王昊, 李静, 等, 2019. 渗流-应力耦合作用对储层裂缝发育的影响研究. 地质力学学报, 25 (4): 483-491. DOI: 10.12090/j.issn.1006-6616.2019.25.04.046
引用本文: 宋子怡, 王昊, 李静, 等, 2019. 渗流-应力耦合作用对储层裂缝发育的影响研究. 地质力学学报, 25 (4): 483-491. DOI: 10.12090/j.issn.1006-6616.2019.25.04.046
SONG Ziyi, WANG Hao, LI Jing, et al., 2019. RESEARCH ON THE INFLUENCE OF THE COUPLING EFFECT OF SEEPAGE AND STRESS ON RESERVOIR FRACTURES. Journal of Geomechanics, 25 (4): 483-491. DOI: 10.12090/j.issn.1006-6616.2019.25.04.046
Citation: SONG Ziyi, WANG Hao, LI Jing, et al., 2019. RESEARCH ON THE INFLUENCE OF THE COUPLING EFFECT OF SEEPAGE AND STRESS ON RESERVOIR FRACTURES. Journal of Geomechanics, 25 (4): 483-491. DOI: 10.12090/j.issn.1006-6616.2019.25.04.046

渗流-应力耦合作用对储层裂缝发育的影响研究

doi: 10.12090/j.issn.1006-6616.2019.25.04.046
基金项目: 

国家科技重大专项 2016ZX05002-002

国家自然科学基金项目 41272141

详细信息
    作者简介:

    宋子怡(1994-), 女, 硕士、助理工程师, 主要研究方向为储层裂缝表征及储层预测。E-mail:songziyiupc@163.com

    通讯作者:

    李静(1967-), 女, 博士、教授、博士生导师, 地质力学及油气储层预测。E-mail:lijing0681@163.com

  • 中图分类号: TE319

RESEARCH ON THE INFLUENCE OF THE COUPLING EFFECT OF SEEPAGE AND STRESS ON RESERVOIR FRACTURES

  • 摘要: 裂缝是影响储层高产、稳产的重要因素,而储层处在复杂的地质环境中,裂缝的形成和发育受众多因素的影响,研究各因素间的耦合作用对储层裂缝发育的影响,对指导油气勘探开发具有重要意义。为此,针对任丘油田任11井区雾迷山组碳酸盐岩储层进行了渗流-应力耦合作用对储层裂缝发育的影响研究。研究结果表明:未考虑渗流-应力耦合作用时,研究区最大水平主应力范围为82~100 MPa,从西南到东北逐渐增大;最小水平主应力范围为72~88 MPa,从研究区中心向西南、东北两侧逐渐递增;考虑耦合作用后,研究区最大水平主应力范围为84~102 MPa,最小水平主应力范围为76~91 MPa,最大及最小水平主应力增加。渗流-应力耦合作用后,研究区裂缝发育指数分布在0.027~1.156之间,山头顶部和近东西向断层的内部区域裂缝发育指数在0.7左右,为裂缝较发育区域;而研究区西南和东北边缘区域裂缝发育指数在0.2以下,为裂缝欠发育区域。随着耦合作用时间的增长,储层裂缝发育指数逐渐增大,在注入井和产油井附近区域的裂缝发育指数增大幅度尤为明显;储层裂缝线密度也呈增大趋势,仅产油井周围的裂缝线密度呈现为先减小后增大的趋势;未考虑耦合作用时的储层裂缝参数小于考虑耦合作用后的裂缝参数,说明仅考虑应力场进行储层裂缝预测所得结果偏小。

     

  • 图  1  应力场与渗流场相互影响示意图

    Figure  1.  Interaction schematic diagram of stress and seepage field

    图  2  任11区雾迷山组储层顶面构造图

    Figure  2.  The top structure of Ren 11 Wumishan formation reservoir

    图  3  两场共同作用数值模拟有限元模型

    Figure  3.  The finite element model of numerical simulation under two fields combined action

    图  4  耦合前后的应力分布云图

    Figure  4.  The distribution of stress before and after coupling

    图  5  储层剪切破裂率、张破裂率与裂缝发育指数分布云图

    Figure  5.  The distribution of shear fracture ratio, tensile fracture ratio and fracture development index

    图  6  耦合前后裂缝密度分布云图

    Figure  6.  The distribution of fracture density before and after coupling

    表  1  模型参数取值

    Table  1.   Parameter values of the model

    区域 力学参数 渗流参数
    弹性模量
    /MPa
    泊松比 密度
    /(kg/m3)
    孔隙度
    /%
    渗透率
    /×10-3 μm2
    流体密度
    /(kg/m3)
    流体粘度
    /(mPa·s)
    断层 23090.04 0.258 2070 9.75 124.34 888.7 8.21
    研究区内非断层 28862.55 0.224 2300 6.50 1.2434 888.7 8.21
    研究区外围 34625.06 0.180 2530 6.50 1.2434 888.7 8.21
    下载: 导出CSV

    表  2  任28井雾迷山组裂缝密度与深度关系表

    Table  2.   The relationship between the crack density and depth of the Well Ren28

    井段/
    m
    孔隙度/
    %
    缝洞面孔率/
    %
    缝密度/
    条/m
    统计结果[19] 3212~3274 3.45 3.28 135
    3274~3321 1.27 0.74 92
    模拟结果 3170~3330 107
    下载: 导出CSV
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  • 收稿日期:  2018-09-15
  • 修回日期:  2019-04-10
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