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致密砂岩储层微观孔喉结构及可动流体分布特征:以鄂尔多斯盆地东部神木地区盒8段储层为例

夏玉磊 兰建平 姚伟

夏玉磊, 兰建平, 姚伟. 致密砂岩储层微观孔喉结构及可动流体分布特征:以鄂尔多斯盆地东部神木地区盒8段储层为例[J]. 地质科技通报, 2024, 43(2): 41-51. doi: 10.19509/j.cnki.dzkq.tb20220574
引用本文: 夏玉磊, 兰建平, 姚伟. 致密砂岩储层微观孔喉结构及可动流体分布特征:以鄂尔多斯盆地东部神木地区盒8段储层为例[J]. 地质科技通报, 2024, 43(2): 41-51. doi: 10.19509/j.cnki.dzkq.tb20220574
XIA Yulei, LAN Jianping, YAO Wei. Micropore structure and movable fluid distribution characteristics of tight sandstone reservoirs: Taking the He 8 reservoir in the Shenmu area of the eastern Ordos Basin as an example[J]. Bulletin of Geological Science and Technology, 2024, 43(2): 41-51. doi: 10.19509/j.cnki.dzkq.tb20220574
Citation: XIA Yulei, LAN Jianping, YAO Wei. Micropore structure and movable fluid distribution characteristics of tight sandstone reservoirs: Taking the He 8 reservoir in the Shenmu area of the eastern Ordos Basin as an example[J]. Bulletin of Geological Science and Technology, 2024, 43(2): 41-51. doi: 10.19509/j.cnki.dzkq.tb20220574

致密砂岩储层微观孔喉结构及可动流体分布特征:以鄂尔多斯盆地东部神木地区盒8段储层为例

doi: 10.19509/j.cnki.dzkq.tb20220574
基金项目: 

国家自然科学基金青年基金项目 52004221

详细信息
    通讯作者:

    夏玉磊, E-mail: xiaylcqzt@163.com

  • 中图分类号: P618.130.2+1

Micropore structure and movable fluid distribution characteristics of tight sandstone reservoirs: Taking the He 8 reservoir in the Shenmu area of the eastern Ordos Basin as an example

More Information
  • 摘要:

    致密砂岩复杂的孔喉结构导致多变的可动流体分布, 而微观孔隙结构和可动流体分布又是研究致密砂岩储层的重点。基于核磁共振可动流体测试原理, 采用离心试验、高压压汞、扫描电镜、X射线衍射及铸体薄片等方法, 建立了神木地区盒8段储层孔隙结构分类标准, 明确了3类岩石孔隙结构参数及孔隙、喉道类型, 提出了适用于目标储层转换系数的新方法, 并定量评价了3类岩石可动流体分布特征。研究结果表明, 目标储层中Ⅰ、Ⅱ类岩石孔隙以孔径大于10 μm的残余粒间孔和孔径大于1 μm的溶蚀孔为主, 喉道以缩小型和弯片状喉道为主, 孔隙结构参数较好, 大孔隙发育程度高、孔喉间连通性好、可动流体赋存量大, 大部分可动流体赋存于T2谱右峰对应的大孔隙中, 而左峰对应的小孔隙中可动流体含量低。Ⅲ类岩石孔隙结构参数差、可动流体百分比低、孔喉以晶间孔和管束状喉道为主。目标储层平均转换系数为0.029 μm/ms, 但Ⅰ、Ⅱ类岩石转换系数小于Ⅲ类, 转换后的Ⅰ、Ⅱ类岩石T2谱的右峰与压汞孔隙半径分布的主峰相对应, 而Ⅲ类岩石T2谱的左峰与压汞孔隙半径分布的主峰相对应。Ⅰ、Ⅱ类岩石孔径大于1 μm的孔隙中可动流体百分比高, 是未来勘探开发的主要方向。研究成果为提高致密油藏采收率提供了参考和借鉴。

     

  • 图 1  Ⅰ类岩石不同离心力离心前后T2谱分布

    Figure 1.  T2 spectrum distribution of the typeⅠrock before and after centrifugation under different centrifugal forces

    图 2  Ⅱ类岩石不同离心力离心前后T2谱分布

    Figure 2.  T2 spectral distribution of the type Ⅱ rock before and after centrifugation under different centrifugal forces

    图 3  Ⅲ类岩石不同离心力离心前后T2谱分布

    Figure 3.  T2 spectrum distribution of the type Ⅲ rock before and after centrifugation under different centrifugal forces

    图 4  目标储层孔隙类型及喉道类型

    a.原生粒间孔充填的自生石英与叶片状绿泥石,扫描电镜,3号岩心;b.多边形粒间孔,铸体薄片,3号岩心;c.宽度不一的微裂缝,扫描电镜,5号岩心;d.孔隙缩小型喉道,铸体薄片,5号岩心;e.长石碎屑溶蚀形成的粒内溶孔,扫描电镜,7号岩心;f.长石溶蚀孔形状,铸体薄片,7号岩心;g.弯片状喉道,铸体薄片,9号岩心;h.晶间孔,扫描电镜,13号岩心;i.发育在伊/蒙混层之间的晶间孔,扫描电镜,15号岩心

    Figure 4.  Pore type and throat type of the target reservoir

    图 5  3类岩石代表岩心最佳离心力后的可动流体分布

    Figure 5.  Movable fluid distribution of the representative core of the three rock types after the optimum centrifugal force

    图 6  经过换算后的T2谱分布与压汞法孔隙半径分布对比

    Figure 6.  Comparison of the T2 spectrum distribution after conversion with the pore radius distribution of the mercury injection method

    图 7  3类岩石代表岩心可动流体及可动流体百分比分布

    Figure 7.  Movable fluid and the percentage distribution of movable fluid of the representative core of the three rock types

    图 8  3类岩石不同孔径区间内可动流体百分比

    Figure 8.  Movable fluid percentage in the different pore size intervals of the three rock types

    表  1  6块岩心不同离心力离心前后含水饱和度变化

    Table  1.   Changes in the water saturation of 6 cores before and after centrifugation with different centrifugal forces

    样品数 施加[0.69, 2.09) MPa离心力 施加[2.09, 2.76) MPa离心力 施加[2.76, 4.14] MPa离心力
    含水饱和度减少量/% 平均减少量/% 含水饱和度减少量/% 平均减少量/% 含水饱和度减少量/% 平均减少量/%
    6 22.14~34.27 19.28 4.31~11.28 7.17 0.66~1.13 0.81
    下载: 导出CSV

    表  2  实验岩心基本物性参数及转换系数

    Table  2.   Basic physical parameters and conversion coefficient of the experimental core

    储层类型 岩心编号 储层物性 可动流体参数 压汞参数 最佳离心力下孔隙动用下限对应T2值/ms 压汞与NMR之间转换系数/(μm·ms-1)
    孔隙度/% 渗透率/10-3μm2 可动流体百分比/% 可动流体孔隙度/% 阈值压力/MPa 中值压力/MPa 中值半径/μm 平均孔喉半径/μm 分选系数 最大进汞饱和度/%
    Ⅰ类 1 9.82 0.086 56.25 5.51 0.97 6.66 0.177 0.258 2.68 93.52 2.28 0.023
    2 6.43 0.045 48.07 3.09 1.55 10.27 0.145 0.495 1.85 94.65 2.76 0.019
    3 8.81 0.076 54.66 4.82 2.24 5.06 0.160 0.210 2.81 72.56 2.82 0.019
    4 6.35 0.067 38.75 2.46 3.96 12.31 0.066 0.117 2.86 68.99 1.98 0.027
    5 9.42 0.206 63.30 5.95 0.81 2.71 0.299 0.482 2.27 100.00 3.17 0.017
    平均 8.17 0.096 52.21 4.37 1.91 7.40 0.170 0.310 2.49 85.94 2.60 0.021
    Ⅱ类 6 9.01 0.150 59.30 5.34 0.43 10.26 0.118 0.194 2.12 71.78 1.68 0.032
    7 6.89 0.082 40.59 2.80 0.51 5.97 0.135 0.282 3.51 99.45 3.53 0.015
    8 7.64 0.036 37.47 2.86 4.88 9.40 0.086 0.102 2.27 72.68 3.88 0.014
    9 7.25 0.020 28.34 2.05 6.30 18.38 0.044 0.059 3.06 73.9 4.26 0.012
    10 10.68 0.127 43.31 4.63 0.91 4.58 0.237 0.400 3.08 90.56 4.68 0.011
    平均 8.29 0.083 41.80 3.54 2.61 9.72 0.120 0.210 2.81 81.67 3.61 0.017
    Ⅲ类 11 5.78 0.007 17.57 1.01 13.11 79.73 0.011 0.046 3.52 70.05 1.13 0.047
    12 5.11 0.005 26.63 1.36 21.90 137.76 0.006 0.034 3.25 52.20 1.08 0.049
    13 9.06 0.014 23.01 2.08 3.22 21.23 0.038 0.043 4.06 80.79 0.84 0.063
    14 9.69 0.030 14.75 1.43 2.05 18.66 0.043 0.116 3.69 98.90 1.32 0.040
    15 7.16 0.014 11.54 0.83 1.67 42.57 0.019 0.207 2.42 94.31 0.96 0.055
    平均 7.36 0.014 18.70 1.34 8.39 59.99 0.020 0.090 3.39 79.25 1.07 0.051
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-10-22
  • 录用日期:  2022-12-07
  • 修回日期:  2022-12-02

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