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致密砂岩储层孔隙结构特征对可动流体赋存的影响: 以鄂尔多斯盆地庆城地区长7段为例

石桓山 胡望水 李涛 李亦博 卢丹阳 刘国文

石桓山, 胡望水, 李涛, 李亦博, 卢丹阳, 刘国文. 致密砂岩储层孔隙结构特征对可动流体赋存的影响: 以鄂尔多斯盆地庆城地区长7段为例[J]. 地质科技通报, 2024, 43(2): 62-74. doi: 10.19509/j.cnki.dzkq.tb20220660
引用本文: 石桓山, 胡望水, 李涛, 李亦博, 卢丹阳, 刘国文. 致密砂岩储层孔隙结构特征对可动流体赋存的影响: 以鄂尔多斯盆地庆城地区长7段为例[J]. 地质科技通报, 2024, 43(2): 62-74. doi: 10.19509/j.cnki.dzkq.tb20220660
SHI Huanshan, HU Wangshui, LI Tao, LI Yibo, LU Danyang, LIU Guowen. Pore throat structure characteristics of tight sandstone reservoirs and their influence on movable fluid occurrence: Taking the Chang-7 Member of Qingcheng area of Ordos Basin as an example[J]. Bulletin of Geological Science and Technology, 2024, 43(2): 62-74. doi: 10.19509/j.cnki.dzkq.tb20220660
Citation: SHI Huanshan, HU Wangshui, LI Tao, LI Yibo, LU Danyang, LIU Guowen. Pore throat structure characteristics of tight sandstone reservoirs and their influence on movable fluid occurrence: Taking the Chang-7 Member of Qingcheng area of Ordos Basin as an example[J]. Bulletin of Geological Science and Technology, 2024, 43(2): 62-74. doi: 10.19509/j.cnki.dzkq.tb20220660

致密砂岩储层孔隙结构特征对可动流体赋存的影响: 以鄂尔多斯盆地庆城地区长7段为例

doi: 10.19509/j.cnki.dzkq.tb20220660
详细信息
    作者简介:

    石桓山, E-mail: 13288014@qq.com

    通讯作者:

    李涛, E-mail: ltm817@163.com

  • 中图分类号: P618.130.2+1

Pore throat structure characteristics of tight sandstone reservoirs and their influence on movable fluid occurrence: Taking the Chang-7 Member of Qingcheng area of Ordos Basin as an example

More Information
  • 摘要:

    分析孔隙结构和可动流体分布特征是储层研究的关键要素,也是当前研究的重点与热点,对致密砂岩油气勘探及提高油气采收率具有重要意义。以鄂尔多斯盆地庆城地区长7段致密砂岩储层为例,通过物性测试、铸体薄片、扫描电镜、高压压汞和核磁共振实验,结合分形理论,分析了致密砂岩储层孔隙结构、非均质性和可动流体分布特征,讨论了孔喉结构和非均质性对可动流体赋存的影响。结果表明:研究区长7段储层储集空间主要由微纳米级孔隙贡献,孔隙连通性较差,孔喉半径主要分布在0.050~0.500 μm;孔喉结构非均质性较强,分形维数分布在2.65~2.90;流体可动性较差,可动流体饱和度分布在16.68%~51.74%,可动流体多分布在中孔和小孔内。研究区长7段储层可分为3类:从Ⅰ类到Ⅲ类储层,剩余粒间孔和粒间溶蚀孔发育变少,孔隙连通性变差,孔喉尺寸变小,较大孔喉变少,非均质性变强,流体可动性变差,中孔和大孔内可动流体含量趋于降低, 可动流体倾向于在小孔内赋存。研究成果为致密砂岩油气勘探及油气采收率提高提供了理论依据。

     

  • 图 1  研究区构造位置平面分布图(a)及延长组地层综合柱状图(b)

    Figure 1.  Plane distribution map of structural position in the study area (a) and comprehensive histogram of the Yanchang Formation (b)

    图 2  研究区长7段砂岩储层孔隙类型及微观特征

    a.Z283井, 1 820.42 m, 粒内溶蚀孔、粒间溶蚀孔和片状喉道,铸体薄片,单偏光; b.N86井, 1 723.74 m, 粒间溶蚀孔、粒内溶蚀孔、剩余粒间孔和弯片状喉道,铸体薄片,单偏光; c: Z193井, 1 755.73 m, 粒间溶蚀孔和粒内溶蚀孔,铸体薄片,单偏光; d.Z283井, 1 823.73 m, 微裂缝,铸体薄片,单偏光; e.Z193井, 1 763.28 m, 晶间微孔和剩余粒间孔,扫描电镜照片; f.T40井, 1 689.13 m, 晶间孔和管束状喉道,扫描电镜照片

    Figure 2.  Pore types and microscopic characteristics of sandstone reservoir of the Chang-7 Memeber in the study area

    图 3  研究区长7段砂岩压汞曲线特征(a)和孔喉半径分布特征(b)

    Figure 3.  Mercury injection curve characteristics (a) and pore throat radius distribution characteristics (b) of the Chang-7 Member sandstone in the study area

    图 4  研究区长7段典型样品分形维数计算曲线

    Figure 4.  Fractal dimension calculation curve of the Chang-7 Member typical samples in the study area

    图 5  研究区长7段典型样品可动流体分布图

    Figure 5.  Movable fluid distribution of the Chang-7 Member typical samples in the study area

    图 6  孔隙类型参数与可动流体饱和度(a)及可动流体分布参数(b, c)关系

    Figure 6.  Relationship between pore type parameters and movable fluid saturation (a) and movable fluid distribution parameters (b, c)

    图 7  孔喉结构参数与可动流体饱和度(a)及可动流体分布参数(b, c)关系图

    Figure 7.  Relationship between pore throat structure parameters and saturation of movable fluid (a) and movable fluid distribution parameters (b, c)

    图 8  孔喉大小分布参数与可动流体饱和度(a, b)及可动流体分布参数(c, d)关系

    Figure 8.  Relationship between pore throat size distribution parameter and movable fluid saturation (a, b) and movable fluid distribution parameters (c, d)

    图 9  可动流体饱和度(a)及可动流体分布参数(b)与分形维数关系图

    Figure 9.  Relationship between saturation of movable fluid (a) and movable fluid distribution parameters (b) and fractal dimension

    表  1  研究区各实验样品基本信息

    Table  1.   Basic information on testing samples in the study area

    编号 井名 埋深/m 空气渗透率/10-3 μm2 孔隙度/% 岩性
    #1 Z193 1 755.73 0.069 8 8.02 灰色粉砂岩
    #2 Z193 1 763.28 0.120 1 9.38 浅灰色细砂岩
    #3 Z193 1 778.45 0.017 3 7.04 浅灰色粉砂岩
    #4 Z193 1 770.59 0.007 9 4.31 灰色粉砂岩
    #5 Z283 1 820.42 0.130 0 10.59 浅灰色细砂岩
    #6 Z283 1 822.57 0.100 5 10.12 浅灰色细砂岩
    #7 Z283 1 823.73 0.123 0 11.91 浅灰色细砂岩
    #8 N86 1 715.69 0.055 4 7.58 浅灰色粉砂岩
    #9 N86 1 719.38 0.027 9 7.05 灰色粉砂岩
    #10 N86 1 723.74 0.113 6 11.79 浅灰色细砂岩
    #11 N86 1 724.82 0.018 7 4.69 浅灰色粉砂岩
    #12 T40 1 685.74 0.011 2 4.12 灰色粉砂岩
    #13 T40 1 688.69 0.007 3 3.90 灰色粉砂岩
    #14 T40 1 689.13 0.008 9 4.21 灰色粉砂岩
    #15 T40 1 691.69 0.009 8 4.06 浅灰色粉砂岩
    下载: 导出CSV

    表  2  研究区各长7段测试分析样品孔喉结构参数及主要孔隙类型的面孔率

    Table  2.   Pore throat structure parameters and face rate of main pore types of the Chang-7 Member testing samples in the study area

    编号 最大孔喉半径/μm 平均孔喉半径/μm 孔喉半径中值/μm 最大汞饱和度/% 排驱压力/MPa 分选系数 歪度 占比/%(半径≥0.1 μm) 占比/%(半径<0.1 μm) 主要孔隙类型的面孔率/% 储层类型
    剩余粒间孔 粒间溶蚀孔 粒内溶蚀孔
    #1 0.263 0.079 0.039 61.35 2.79 1.40 0.39 11.62 88.38 1.0 0.5 0.5
    #2 0.265 0.059 0.021 67.05 2.78 1.52 0.20 22.56 77.44 0.5 1.0 1.0
    #3 0.267 0.077 0.033 61.76 2.76 1.59 0.23 42.92 57.08 0.0 0.0 0.0
    #4 0.133 0.045 0.021 57.14 5.54 1.60 -0.05 7.08 92.92 0.0 0.0 0.5
    #5 0.359 0.098 0.035 68.68 2.05 2.50 -0.01 47.55 52.45 1.5 2.0 1.0
    #6 0.554 0.169 0.074 67.03 1.33 1.61 0.49 68.09 31.91 2.0 2.0 0.5
    #7 1.112 0.197 0.096 69.02 0.66 1.68 0.46 66.77 33.23 2.5 1.5 0.25
    #8 0.183 0.057 0.028 61.79 4.02 1.52 0.13 23.97 76.03 0.0 0.0 0.5
    #9 0.251 0.073 0.025 60.75 2.93 2.43 -0.02 39.00 61.00 0.5 0.0 0.0
    #10 0.186 0.058 0.040 72.41 3.95 1.49 0.06 22.86 77.14 1.5 1.0 0.5
    #11 0.096 0.030 0.011 52.61 7.66 3.03 -0.59 0.00 100 0.0 0.0 0.0
    #12 0.094 0.023 0.008 51.64 7.82 2.29 -0.41 0.00 100 0.0 0.0 0.5
    #13 0.075 0.019 / 34.75 9.80 2.57 -0.54 0.00 100 0.0 0.0 0.0
    #14 0.057 0.018 / 34.90 13.00 3.98 -0.73 0.00 100 0.0 0.0 0.5
    #15 0.098 0.017 / 40.07 7.50 2.56 -0.42 0.00 100 0.0 0.0 0.0
    下载: 导出CSV

    表  3  研究区各长7段测试样品分形维数及相关系数

    Table  3.   Fractal dimension and correlation coefficient of the Chang-7 Member testing samples in the study area

    样品编号 #1 #2 #3 #4 #5 #6 #7 #8
    分形维数 2.789 8 2.719 5 2.792 9 2.868 6 2.708 9 2.713 7 2.779 7 2.707 3
    R2 0.871 4 0.994 5 0.922 6 0.960 1 0.988 1 0.916 6 0.936 2 0.962 2
    储层类型
    样品编号 #9 #10 #11 #12 #13 #14 #15
    分形维数 2.743 9 2.686 9 2.728 1 2.780 5 2.930 4 2.817 9 2.834 9
    R2 0.973 0 0.986 6 0.985 5 0.982 5 0.948 2 0.980 7 0.980 3
    储层类型
    下载: 导出CSV

    表  4  研究区长7段实验样品可动流体分布参数

    Table  4.   Movable fluid distribution parameters of the Chang-7 Member testing samples in the study area

    编号 储层类型 可动流体饱和度/% 可动流体分布体积分数/%
    微孔(T2≤1 ms) 小孔(1 ms<T2≤10 ms) 中孔(10 ms<T2≤100 ms) 大孔(100 ms<T2≤1 000 ms) 微裂缝(T2>1 000 ms)
    #1 43.46 1.86 46.85 47.65 3.64 0.00
    #2 45.86 0.00 35.43 60.23 4.34 0.00
    #3 39.26 0.45 47.94 50.37 1.24 0.00
    #4 32.76 0.79 64.89 34.32 0.00 0.00
    #5 49.08 0.00 6.15 63.17 30.68 0.00
    #6 51.74 0.00 7.76 60.97 31.27 0.00
    #7 49.39 0.00 3.51 56.69 39.81 0.00
    #8 38.95 2.44 22.41 44.69 30.46 0.00
    #9 39.79 0.00 34.12 59.46 6.26 0.15
    #10 40.06 1.39 0.96 83.23 14.42 0.00
    #11 41.57 13.43 61.97 21.79 2.82 0.00
    #12 30.73 7.17 53.72 36.03 2.85 0.06
    #13 16.68 0.00 90.09 3.16 6.75 0.00
    #14 32.78 3.29 49.55 34.39 12.77 0.00
    #15 28.51 43.21 16.42 29.28 10.30 0.03
    下载: 导出CSV
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  • 收稿日期:  2022-11-27
  • 录用日期:  2023-01-09
  • 修回日期:  2022-12-22

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