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深层致密砂岩储层可压裂性评价新方法

曾治平 刘震 马骥 张春磊 李静 刘振 孙鲁宁

曾治平, 刘震, 马骥, 等, 2019. 深层致密砂岩储层可压裂性评价新方法. 地质力学学报, 25 (2): 223-232. DOI: 10.12090/j.issn.1006-6616.2019.25.02.021
引用本文: 曾治平, 刘震, 马骥, 等, 2019. 深层致密砂岩储层可压裂性评价新方法. 地质力学学报, 25 (2): 223-232. DOI: 10.12090/j.issn.1006-6616.2019.25.02.021
ZENG Zhiping, LIU Zhen, MA Ji, et al., 2019. A NEW METHOD FOR FRACRABILITY EVALUATION IN DEEP AND TIGHT SANDSTONE RESERVOIRS. Journal of Geomechanics, 25 (2): 223-232. DOI: 10.12090/j.issn.1006-6616.2019.25.02.021
Citation: ZENG Zhiping, LIU Zhen, MA Ji, et al., 2019. A NEW METHOD FOR FRACRABILITY EVALUATION IN DEEP AND TIGHT SANDSTONE RESERVOIRS. Journal of Geomechanics, 25 (2): 223-232. DOI: 10.12090/j.issn.1006-6616.2019.25.02.021

深层致密砂岩储层可压裂性评价新方法

doi: 10.12090/j.issn.1006-6616.2019.25.02.021
基金项目: 

国家科技重大专项 2016ZX05002-002

国家自然科学基金 41272141

详细信息
    作者简介:

    曾治平(1977-), 男, 高级工程师, 博士, 从事石油地质与油气成藏研究。E-mail: zengzhipingupc@163.com

    通讯作者:

    李静(1967-), 女, 博士, 教授, 博士生导师, 主要从事岩石力学与地质力学方面的教学与研究工作。E-mail: lijing0681@163.com

  • 中图分类号: TE349

A NEW METHOD FOR FRACRABILITY EVALUATION IN DEEP AND TIGHT SANDSTONE RESERVOIRS

  • 摘要: 岩石可压性评价是储层压裂改造层位优选、压后产能评估的重要基础工作。准中4区块致密砂岩储层埋藏深、物性差,亟需通过压裂改造提高工业产能。因此,以董2井北三维区侏罗系致密砂岩为例,基于岩石三轴实验建立了致密砂岩断裂能密度—弹性模量的拟合公式,采用矿物成分法和弹模-泊松比法确定了研究区不同深度岩石脆性指数,采用岩石破裂准则确定了研究区不同深度的裂缝发育指数。以断裂能密度表征致密砂岩断裂韧性,以裂缝发育指数表征储层天然裂缝发育程度,综合考虑岩石脆性、断裂韧性、地应力环境和天然裂缝发育程度的影响,采用层次分析法计算了各因素权重,建立了适合深层致密砂岩的可压性评价方法。研究结果表明,可压裂性指数大于0.55时,可压性好;可压裂性指数介于0.50~0.55之间时,可压性一般;可压裂性指数小于0.50时,可压性差;研究区D7井的最佳压裂层位为4145~4160 m、4470~4480 m、5290~5330 m,D8井的最佳压裂层位为5120~5330 m、5350~5365 m,D701井的最佳压裂层位为3900~3910 m、4430~4440 m、4455~4465 m、5125~5135 m。

     

  • 图  1  研究区矿物成分含量图

    Figure  1.  The composition of rock samples in the study area

    图  2  研究区侏罗系成分含量图

    ①-石英砂岩;②-次长石砂岩;③-次岩屑砂岩;④-长石砂岩;⑤-岩屑长石砂岩;⑥-长石岩屑砂岩;⑦-岩屑砂岩

    Figure  2.  The composition of rock samples in the Jurassic reservoir in the study area

    图  3  弹模—泊松比法表征研究区脆性指数

    Figure  3.  Using elastic modulus Poisson's ratio method to characterize the brittleness index of the study area

    图  4  不同围压下致密砂岩应力—应变全曲线

    Figure  4.  Stress-strain curves of tight sandstone under different confining pressures

    图  5  静态弹性模量与断裂能密度拟合曲线

    Figure  5.  Fitting curves of static modulus of elasticity and fracture energy density

    图  6  深层致密砂岩储层可压性层次结构模型

    Figure  6.  The hierarchical structure model of the deep tight sandstone reservoir fracability

    图  7  研究区可压裂性指数

    Figure  7.  Fracrability index of the study area

    图  8  研究区D7井储层可压性综合评价

    Figure  8.  Comprehensive evaluation of reservoir fracrability in Well D7 in the study area

    图  9  研究区D8井储层可压性综合评价

    Figure  9.  Comprehensive evaluation of reservoir fracrability in Well D8 in the study area

    图  10  研究区D701井储层可压性综合评价

    Figure  10.  Comprehensive evaluation of reservoir fracrability in Well D701 in the study area

    图  11  研究区D8井原始微震点图

    Figure  11.  The original microseismic points of the Well D8 in the study area

    表  1  研究区致密砂岩弹性模量及断裂能密度表

    Table  1.   Elastic modulus and fracture energy density table for tight sandstone in the study area

    井号 编号 围压/
    MPa
    峰值强度/
    MPa
    残余应力/
    MPa
    弹性模量/
    GPa
    断裂能密度/
    (N·mm·mm-3)
    D7 1 0 54.5 6.5 9.55 23.35
    2 10 106.7 61.8 12.16 51.94
    3 30 191.5 134.2 19.09 133.99
    4 40 206.4 162.4 19.19 151.86
    D8 5 0 49.9 15.8 8.87 41.75
    6 10 140.7 67.4 16.40 121.78
    7 30 237.3 186.9 22.46 175.04
    8 20 188.9 97.3 19.50 158.31
    D701 9 0 24.4 4.7 4.28 21.06
    10 0 22.4 4.8 4.27 19.26
    11 20 136.0 80.3 15.64 107.52
    12 40 186.3 161.1 17.74 142.94
    下载: 导出CSV

    表  2  判断矩阵标度

    Table  2.   Judgement matrix scale

    标度 含义
    1 表示两影响因素ij相比,重要性相同
    3 表示两影响因素ij相比,一个比另一个稍微重要
    5 表示两影响因素ij相比,一个比另一个重要
    7 表示两影响因素ij相比,一个比另一个明显重要
    9 表示两影响因素ij相比,一个比另一个极其重要
    2、4、6、8 上述两相邻判断中间值
    注:影响因素ij比较判断值为Aij,则ji比较判断值为1/Aij
    下载: 导出CSV

    表  3  可压裂性指标判断矩阵

    Table  3.   Judgment matrix for fracrability index

    A 脆性
    指数
    断裂能
    密度
    水平应力
    差异系数
    裂缝发育
    指数
    脆性指数 1 2 2 3
    断裂能密度 1/2 1 1 2
    水平应力差异系数 1/2 1 1 2
    裂缝发育指数 1/3 1/2 1/2 1
    下载: 导出CSV
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  • 收稿日期:  2018-09-14
  • 修回日期:  2018-12-15
  • 刊出日期:  2019-04-01

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