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致密砂岩孔喉结构分析与渗透率预测方法——以川中地区侏罗系沙溪庙组为例

陈少云 杨勇强 邱隆伟 王小娟 杨保良 叶热杰普·哈布腊什木

陈少云, 杨勇强, 邱隆伟, 王小娟, 杨保良, 叶热杰普·哈布腊什木. 致密砂岩孔喉结构分析与渗透率预测方法——以川中地区侏罗系沙溪庙组为例[J]. 石油实验地质, 2024, 46(1): 202-214. doi: 10.11781/sysydz202401202
引用本文: 陈少云, 杨勇强, 邱隆伟, 王小娟, 杨保良, 叶热杰普·哈布腊什木. 致密砂岩孔喉结构分析与渗透率预测方法——以川中地区侏罗系沙溪庙组为例[J]. 石油实验地质, 2024, 46(1): 202-214. doi: 10.11781/sysydz202401202
CHEN Shaoyun, YANG Yongqiang, QIU Longwei, WANG Xiaojuan, YANG Baoliang, Erejep HABILAXIM. Pore throat structure analysis and permeability prediction method of tight sandstone: a case study of Jurassic Shaximiao Formation in central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(1): 202-214. doi: 10.11781/sysydz202401202
Citation: CHEN Shaoyun, YANG Yongqiang, QIU Longwei, WANG Xiaojuan, YANG Baoliang, Erejep HABILAXIM. Pore throat structure analysis and permeability prediction method of tight sandstone: a case study of Jurassic Shaximiao Formation in central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(1): 202-214. doi: 10.11781/sysydz202401202

致密砂岩孔喉结构分析与渗透率预测方法——以川中地区侏罗系沙溪庙组为例

doi: 10.11781/sysydz202401202
基金项目: 

国家自然科学基金项目“咸化湖盆细粒物质的成因及其混合沉积作用” 41972099

“基于现代沉积和沉积模拟的湖相滩坝沉积模式与精细表征研究” 4217020246

详细信息
    作者简介:

    陈少云(1998-), 男, 硕士生, 主要从事储层沉积学研究。E-mail: chenshaoyun1998@163.com

    通讯作者:

    杨勇强(1982-), 男, 博士, 副教授, 主要从事沉积学、储层地质学研究。E-mail: yongqiangyang@upc.edu.cn

  • 中图分类号: TE122.2

Pore throat structure analysis and permeability prediction method of tight sandstone: a case study of Jurassic Shaximiao Formation in central Sichuan Basin

  • 摘要: 致密砂岩储层孔喉结构精细表征和渗透性预测是优质储层评价和开发的关键。以川中地区侏罗系沙溪庙组为例,利用高压压汞实验和分形理论,对孔喉结构进行静态表征,探讨孔喉结构、分形维数、储层物性之间的关系,进而分析孔喉结构对渗透率的贡献,建立渗透率预测模型。沙溪庙组样品可分为4种类型:Ⅰ类样品排驱压力低、物性好、孔隙连通性好、平均分形维数为2.11,孔隙以半径大于0.1 μm的大孔和中孔为主,半径大于1 μm的孔喉贡献了90%以上的渗透率;Ⅱ类样品排驱压力在0.4~1.0 MPa之间,平均孔渗分别为9.72%、0.375×10-3 μm2,分形维数为2.20,半径大于0.1 μm的中孔含量上升,并贡献了大部分渗透率;Ⅲ、Ⅳ类样品排驱压力与分形维数明显高于Ⅰ、Ⅱ类样品,孔隙度低且缺乏大孔导致渗透率较低。半径大于0.1 μm的大孔和中孔贡献了沙溪庙组98%以上的渗透率。分形维数是指示孔喉结构的良好标志,分形维数与孔喉半径、最大进汞饱和度、渗透率均呈现明显的负相关关系,而与排驱压力、孔喉相对分选系数呈正相关关系。分形维数与孔喉组成有着强相关性,基于分形维数、孔隙度、最大孔喉半径建立了“孔隙型”储层渗透率定量预测模型。

     

  • 图  1  四川盆地构造分区与侏罗系岩性特征

    Figure  1.  Tectonic zoning map of Sichuan Basin and lithologic characteristics of Jurassic

    图  2  川中侏罗系沙溪庙组致密砂岩储层岩石学与物性分布特征

    Figure  2.  Petrological characteristics and physical property distribution of tight sandstone reservoir in Jurassic Shaximiao Formation, central Sichuan Basin

    图  3  川中侏罗系沙溪庙组致密砂岩孔喉微观特征

    a.原生粒间孔,永浅1井,2 260.77 m;b.原生粒间孔隙,永浅1井,2 184.34 m;c.自生石英充填原生粒间孔隙,长石溶蚀,秋林21井,2 459.13 m;d.铸模孔、原生孔基础上溶蚀形成的复合孔隙,永浅1井,2 256.13 m;e.长石严重溶蚀,秋林21井,2 459.13 m;f.绿泥石未被完全包裹的长石发生溶蚀,周边伴随自生钠长石,秋林18井,2 103.88 m;g.长石与火山岩岩屑发生溶蚀,边缘存在粒间孔,永浅1井,2 200.36 m;h.浊沸石沿着解理缝发生溶蚀,伴随发育微裂缝,中浅1井,2 669.00 m;i.石英颗粒溶蚀形成纳米级孔隙,永浅1井,2 189.20 m;j.伊利石充填孔隙,并发育伊利石晶间孔,永浅1井,2 256.13 m;k.伊利石晶间孔,秋林202井,2 274.63 m;l.云母层间孔,永浅1井,2 188.65 m;m.板状喉道,秋林18井,2 103.88 m;n.缩颈状喉道,秋林18井,2 103.88 m;o.孔隙缩小型喉道,永浅1井,2 252.43 m。

    Figure  3.  Microscopic characteristics of pore throat of tight sandstones in Jurassic Shaximiao Formation, central Sichuan Basin

    图  4  川中侏罗系沙溪庙组致密砂岩不同类型样品的毛细管压力曲线、孔喉分布与孔喉含量特征

    Figure  4.  Capillary pressure curves, pore throat distribution and pore throat content characteristics of different types of tight sandstone samples in Jurassic Shaximiao Formation, central Sichuan Basin

    图  5  川中侏罗系沙溪庙组致密砂岩不同类型样品的孔喉结构参数与物性对比

    Figure  5.  Comparison of pore throat structure parameters and physical properties of different types of tight sandstone samples in Jurassic Shaximiao Formation, central Sichuan Basin

    图  6  川中侏罗系沙溪庙组致密砂岩孔喉分形曲线

    Figure  6.  Pore throat fractal curves of tight sandstones in Jurassic Shaximiao Formation, central Sichuan Basin

    图  7  川中侏罗系沙溪庙组致密砂岩分形维数与储层物性、孔喉结构关系

    Figure  7.  Relations of fractal dimension with reservoir physical property and pore throat structure of tight sandstones in Jurassic Shaximiao Formation, central Sichuan Basin

    图  8  川中侏罗系沙溪庙组致密砂岩孔喉分布频率与渗透率贡献度、分形维数的关系

    Figure  8.  Relations of pore throat distribution frequency with permeability contribution and fractal dimension of tight sandstones in Jurassic Shaximiao Formation, central Sichuan Basin

    图  9  川中侏罗系沙溪庙组致密砂岩孔喉分布对渗透率的控制作用

    Figure  9.  Controlling effect of pore throat distribution on permeability of tight sandstones in Jurassic Shaximiao Formation, central Sichuan Basin

    图  10  川中侏罗系沙溪庙组致密砂岩孔喉相对百分含量与渗透率贡献柱状图

    Figure  10.  Bar chart of relative percentage of pore throat content and permeability contribution of tight sandstones in Jurassic Shaximiao Formation, central Sichuan Basin

    图  11  川中侏罗系沙溪庙组致密砂岩实测渗透率与孔隙度、预测渗透率交会图

    Figure  11.  Cross plots of measured permeability with porosity and predicted permeability of tight sandstones in Jurassic Shaximiao Formation, central Sichuan Basin

    表  1  川中侏罗系沙溪庙组致密砂岩高压压汞实验数据与分形维数

    Table  1.   Data and fractal dimension of high pressure mercury injection experiment of tight sandstones in Jurassic Shaximiao Formation, central Sichuan Basin

    编号 深度/m Ra/μm Rp/μm Pcd/MPa Smax/% Sr/% Sp Df Φ/% K/10-3 μm2 类型
    1 1 989.92 0.358 0.112 2.055 64.647 37.269 2.374 2.247 5.712 0.036
    2 1 990.86 0.267 0.099 2.750 53.728 32.934 2.253 2.250 6.173 0.028
    3 2 001.93 1.087 0.210 0.676 75.730 46.153 2.810 2.265 7.452 0.085
    4 2 004.43 1.086 0.294 0.677 62.411 43.635 2.981 2.240 8.712 0.294
    5 2 009.09 1.086 0.244 0.677 73.665 44.017 2.907 2.221 8.712 0.228
    6 2 011.08 1.087 0.308 0.676 60.070 41.364 3.034 2.198 9.737 0.461
    7 2 014.04 1.087 0.290 0.676 61.743 43.857 3.003 2.225 9.557 0.320
    8 2 018.23 0.053 0.015 13.779 42.776 29.302 1.106 2.785 6.718 0.291
    9 2 029.94 0.538 0.156 1.366 70.785 51.862 2.561 2.242 11.730 0.129
    10 2 034.23 1.087 0.354 0.676 90.474 72.657 2.699 2.137 15.261 0.497
    11 2 036.69 1.087 0.197 0.676 71.386 52.865 2.726 2.212 12.413 0.220
    12 2 048.33 1.087 0.314 0.676 65.348 45.388 3.063 2.189 9.037 0.369
    13 2 070.04 1.090 0.262 0.675 60.806 33.866 2.906 2.173 6.532 0.191
    14 2 105.19 0.053 0.015 13.773 49.683 33.196 1.157 2.741 4.698 0.107
    15 2 110.78 0.269 0.081 2.735 63.847 37.899 2.210 2.326 7.495 8.919
    16 2 130.34 1.086 0.316 0.677 45.235 29.699 2.928 2.199 12.095 0.661
    17 2 138.45 0.133 0.039 5.511 41.408 28.434 1.665 2.331 5.172 0.361
    18 2 160.82 0.268 0.100 2.740 68.555 41.799 2.295 2.243 4.390 0.029
    19 2 163.37 2.796 0.731 0.263 73.509 52.679 3.528 2.165 11.214 1.569
    20 2 180.85 0.537 0.161 1.370 43.286 29.713 2.504 2.238 5.375 0.030
    21 2 183.24 1.566 0.382 0.469 70.452 47.995 3.188 2.188 12.223 0.481
    22 2 186.28 2.750 0.654 0.267 67.665 45.720 3.444 2.141 8.771 1.090
    23 2 190.69 6.668 1.574 0.110 73.386 51.757 3.999 2.130 14.656 6.341
    24 2 194.69 5.337 1.121 0.138 67.981 50.614 3.808 2.135 14.681 4.995
    25 2 199.77 1.550 0.453 0.474 69.515 44.099 3.231 2.159 9.645 0.834
    26 2 226.11 0.134 0.046 5.503 56.045 35.925 1.846 2.338 3.529 0.027
    27 2 249.29 0.537 0.130 1.368 58.891 33.227 2.430 2.264 5.898 0.028
    28 2 250.61 2.780 0.598 0.264 73.366 54.778 3.430 2.144 10.234 2.164
    29 2 253.21 2.776 0.683 0.265 88.211 49.961 3.029 2.073 9.572 1.647
    30 2 255.25 6.670 1.605 0.110 74.285 44.024 4.006 2.047 17.502 17.422
    31 2 259.85 2.747 0.640 0.268 57.631 29.178 3.301 2.068 22.283 2.132
    32 2 261.41 5.338 1.049 0.138 94.218 57.087 2.846 2.065 13.585 4.255
    33 2 261.92 1.073 0.363 0.685 83.820 56.418 3.137 2.133 5.032 0.237
    下载: 导出CSV

    表  2  川中侏罗系沙溪庙组致密砂岩渗透率与分形维数、孔隙度、孔喉半径相关性

    Table  2.   Relations of permeability with fractal dimension, porosity and pore throat radius of tight sandstones in Jurassic Shaximiao Formation, central Sichuan Basin

    公式 相关系数(R2)
    lgK=4.452Df+2.014lgRa+0.065Φ-10.588 0.900
    lgK=2.092Df+1.370lgR15+0.083Φ-5.545 0.817
    lgK=4.580Df+1.930lgR20+0.071Φ-10.549 0.888
    lgK=2.466Df+1.276lgR25+0.085Φ-6.090 0.811
    lgK=-5.042Df+0.209lgR50+0.083Φ+10.132 0.650
    lgK=4.690Df+2.236lgRp+0.055Φ-10.111 0.896
    注:RaRp分别代表最大连通孔喉半径与平均孔喉半径,R15R20R25R50分别对应进汞饱和度为15%、20%、25%、50%时的孔喉半径。
    下载: 导出CSV
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  • 收稿日期:  2023-07-28
  • 修回日期:  2023-12-01
  • 刊出日期:  2024-01-28

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