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高压压汞与核磁共振技术在致密储层孔隙结构分析中的应用: 以鄂尔多斯盆地合水地区为例

卢振东 刘成林 臧起彪 吴育平 杨熙雅 阳宏 曾晓祥 李闻达

卢振东, 刘成林, 臧起彪, 吴育平, 杨熙雅, 阳宏, 曾晓祥, 李闻达. 高压压汞与核磁共振技术在致密储层孔隙结构分析中的应用: 以鄂尔多斯盆地合水地区为例[J]. 地质科技通报, 2022, 41(3): 300-310. doi: 10.19509/j.cnki.dzkq.2021.0256
引用本文: 卢振东, 刘成林, 臧起彪, 吴育平, 杨熙雅, 阳宏, 曾晓祥, 李闻达. 高压压汞与核磁共振技术在致密储层孔隙结构分析中的应用: 以鄂尔多斯盆地合水地区为例[J]. 地质科技通报, 2022, 41(3): 300-310. doi: 10.19509/j.cnki.dzkq.2021.0256
Lu Zhendong, Liu Chenglin, Zang Qibiao, Wu Yuping, Yang Xiya, Yang Hong, Zeng Xiaoxiang, Li Wenda. Application of high pressure mercury injection and nuclear magnetic resonance in analysis of the pore structure of dense sandstone: A case study of the Heshui area, Ordos Basin[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 300-310. doi: 10.19509/j.cnki.dzkq.2021.0256
Citation: Lu Zhendong, Liu Chenglin, Zang Qibiao, Wu Yuping, Yang Xiya, Yang Hong, Zeng Xiaoxiang, Li Wenda. Application of high pressure mercury injection and nuclear magnetic resonance in analysis of the pore structure of dense sandstone: A case study of the Heshui area, Ordos Basin[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 300-310. doi: 10.19509/j.cnki.dzkq.2021.0256

高压压汞与核磁共振技术在致密储层孔隙结构分析中的应用: 以鄂尔多斯盆地合水地区为例

doi: 10.19509/j.cnki.dzkq.2021.0256
基金项目: 

国家自然科学基金项目 41872127

详细信息
    作者简介:

    卢振东(1997—), 男, 现正攻读地质资源与地质工程专业硕士学位, 主要从事石油地质勘探与资源评价方面的研究工作。E-mail: Luzhd2019@163.com

    通讯作者:

    刘成林(1970—), 男, 教授, 博士生导师, 主要从事油气地球化学与资源评价、非常规油气地质的研究和教学工作。E-mail: liucl@cup.edu.cn

  • 中图分类号: P588.21+2.3

Application of high pressure mercury injection and nuclear magnetic resonance in analysis of the pore structure of dense sandstone: A case study of the Heshui area, Ordos Basin

  • 摘要:

    孔隙结构制约着油气在储层中的储集能力和流动能力, 是研究致密砂岩储层的关键要素, 也是当前研究的重点和难点问题。以鄂尔多斯盆地合水地区上三叠统延长组长7致密储层为例, 结合高压压汞、核磁共振等分析技术, 对储层孔隙结构、可动流体参数之间的关系进行了深入研究, 主要取得以下认识: ①利用常规方法, 线性最小二乘法将核磁共振T2谱转换孔隙半径时, 这种通过线性关系得到的结果精度较低, 相关系数为(0.87~0.98)/0.92, 通过分形理论, 计算出压汞曲线对应的拐点, 进行分段换算出对应的T2, 以此为界限将核磁共振T2谱分段转换, 结果显示转化后曲线叠合程度高, 相关系数(0.97~0.99)/0.98;②通过分析流体可动性的影响因素, 岩石的物性具有直接的关系, 其中孔隙度更适合表征储层的储集空间大小, 相关性为0.9, 和可动流体饱和度的相关性更好; 孔隙结构特征参数与可动流体参数相关性较好, 致密的孔隙结构制约着流体的可动性。

     

  • 图 1  Z143_1样品核磁共振T2与孔隙半径转换

    Figure 1.  Sample Z143_1 NMR T2 and pore radius conversion

    图 2  合水地区不同岩心核磁孔隙半径分布与压汞孔隙半径分布对比

    Figure 2.  Comparison of the nuclear magnetic pore radius distribution and mercury injection pore radius distribution of different cores in the Heshui area

    图 3  Z143_1样品核磁共振T2与孔隙半径转换-改进后

    Figure 3.  Z143_ 1 Sample NMR T2 and pore radius conversion-after improvement

    图 4  合水地区不同岩心核磁孔隙半径分布与压汞孔隙半径分布对比

    Figure 4.  Comparison of the nuclear magnetic pore radius distribution and mercury injection pore radius distribution of different cores in the Heshui area

    图 5  不同状态下孔隙示意图

    Figure 5.  Schematic diagram of pores under different states

    图 6  合水地区长7储层可动流体参数与孔隙度关系图

    Figure 6.  Relationship between movable fluid parameters and porosity of the Chang 7 reservoir in the Heshui area

    图 7  合水地区长7储层可动流体参数与渗透率关系图

    Figure 7.  Relationship between movable fluid parameters and permeability of the Chang 7 reservoir in the Heshui area

    图 8  合水地区长7储层可动流体参数与孔喉结构参数关系图

    Figure 8.  Relationship between movable fluid parameters and pore throat structure parameters of the Chang 7 reservoir in the Heshui area

    图 9  可动流体参数和死孔隙占比关系

    Figure 9.  Relationship between movable fluid parameters and proportion of dead pores

    表  1  岩样基本物性参数

    Table  1.   Basic physical parameters of rock samples

    岩样编号 深度/m 压汞测试样品 核磁测试样品
    直径/cm 长度/cm 压汞孔隙度/% 压汞渗透率/10-3 μm2 直径/cm 长度/cm 核磁孔隙度/% 气测孔隙度/% 气测渗透率/10-3 μm2
    L23_1 1 645.4 2.52 2.32 10.3 0.156 2.52 3.29 11.83 11.8 0.150
    L23_2 1 672.0 2.51 2.35 7.6 0.055 2.51 3.35 8.55 7.9 0.024
    L205_1 1 636.9 2.52 2.30 9.1 0.049 2.52 3.50 10.57 10.0 0.050
    Z143_1 1 842.7 2.53 2.32 6.8 0.028 2.53 3.73 12.20 7.9 0.024
    N181_1 1 613.6 2.53 2.27 3.5 0.017 2.53 3.20 5.50 4.9 0.088
    N181_2 1 659.7 2.52 2.42 2.6 0.011 2.52 3.31 5.85 4.4 0.005
    下载: 导出CSV

    表  2  合水地区不同岩心转化系数

    Table  2.   Conversion coefficients of different cores in Heshui Area

    样品编号 气测孔隙度/% 气测渗透率/10-3 μm2 最大进汞饱和度/% C $ \frac{1}{n}$ R2
    L23-1 0.156 10.3 68.302 0.007 2 0.851 8 0.93
    L23-2 0.055 7.6 62.615 0.001 7 0.487 5 0.92
    L205-1 0.049 9.1 66.904 0.007 9 0.779 9 0.90
    Z143-1 0.028 6.8 61.204 0.000 8 1.241 7 0.90
    N181-1 0.017 3.5 53.509 0.010 2 0.871 7 0.87
    N181-2 0.011 2.6 52.459 0.002 5 1.014 3 0.98
    下载: 导出CSV

    表  3  合水地区样品分形计算结果和转化系数计算结果

    Table  3.   Fractal calculation results and conversion coefficient calculation results of samples in the Heshui area

    样品编号 大孔 小孔 拐点半径ra/μm R2
    Dp-1 C 1/n Dp-2 C 1/n
    L23_1 2.598 7 0.015 9 0.642 8 2.830 8 0.000 7 2.191 3 0.050 0 0.99
    L23_2 2.687 5 0.019 3 0.366 3 2.787 6 0.002 3 1.852 1 0.039 0 0.99
    L205_1 2.606 8 0.015 2 0.571 3 2.773 3 0.000 9 2.420 7 0.039 0 0.99
    Z143_1 2.614 5 0.007 5 0.678 7 2.810 8 0.000 05 2.290 5 0.053 7 0.99
    N181_1 2.670 5 0.016 4 0.584 6 2.826 0 0.003 1 2.611 6 0.022 0 0.97
    N181_2 2.822 5 0.000 9 1.355 5 2.678 3 0.002 7 0.981 2 0.026 0 0.98
    下载: 导出CSV

    表  4  束缚孔隙度和死孔隙占比计算结果

    Table  4.   Calculation results of bound porosity and dead porosity

    样品编号 气测 核磁测试 束缚孔隙度/% 死孔隙(含水)/%
    有效孔隙度/% 核磁孔隙度/% 离心孔隙度/% 可动流体孔隙度/% 可动流体饱和度/%
    L23-1 11.82 11.83 6.22 5.61 47.38 6.21 0.01
    L23-2 7.87 8.55 5.20 3.35 39.25 4.52 0.68
    L205-1 10.04 10.57 5.90 4.67 44.16 5.37 0.53
    Z143-1 7.87 12.20 7.43 4.77 39.13 3.10 4.33
    N181-1 4.87 5.50 3.16 2.34 42.51 2.53 0.63
    N181-2 4.38 5.85 4.03 1.82 31.03 2.56 1.47
    下载: 导出CSV

    表  5  合水地区长7储层可动流体参数与孔喉结构参数数据

    Table  5.   Movable fluid parameters and pore throat structure parameters of Chang 7 reservoir inHeshui Area

    样品编号 可动流体参数 孔喉结构参数
    孔喉连通特征 孔喉大小特征 孔喉分布特征
    可动流体饱和度Smfs/% 可动流体孔隙度φmfs/% 最大进汞饱和度SHgmax/% 退汞饱和度/% 排驱压力/MPa 最大孔隙半径/μm 中值孔隙半径/μm 平均孔隙半径/μm 分选系数 歪度
    L23-1 47.38 5.61 68.30 17.72 1.148 0.640 0.067 0.130 1.563 0.28
    L23-2 39.25 3.35 62.62 15.86 3.983 0.185 0.029 0.059 1.494 0.102
    L205-1 44.16 4.67 66.90 19.27 3.977 0.185 0.036 0.059 1.837 0.038
    Z143-1 39.13 4.77 61.20 17.05 2.947 0.249 0.01 0.075 2.361 0.032
    N181-1 42.51 2.34 53.51 15.14 7.573 0.097 0.01 0.031 3.269 0.612
    N181-2 31.03 1.82 52.46 12.72 7.571 0.097 0.007 0.024 2.369 0.402
    下载: 导出CSV

    表  6  死孔隙占比计算结果

    Table  6.   Calculation results of dead pore proportion

    样品编号 核磁孔隙度/% 可动流体孔隙度/% 束缚孔隙度/% 死孔隙(含水)/% 死孔隙占比/%
    L23-1 11.83 5.61 6.21 0.01 0.08
    L23-2 8.55 3.35 4.52 0.68 7.95
    L205-1 10.57 4.67 5.37 0.53 5.01
    Z143-1 12.20 4.77 3.10 4.33 35.49
    N181-1 5.50 2.34 2.53 0.63 11.45
    N181-2 5.85 1.82 2.56 1.47 25.13
    下载: 导出CSV
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