Research on the characteristics of fluid mobility of the tight reservoir with the NMR fluid distribution pore classification method
Received date: 2024-02-16
Online published: 2025-03-13
Copyright
The Chang 8 tight sandstone reservoir is taken as the research object, and combining with the refined classification method of fluid distribution pore based on NMR fractal theory, the fluid motility of three different types of tight sandstone core samples were carried out to quantitatively characterize the fluid motility with the NMR tests. The experimental results show that the fluid motility of different types of cores is the result of the coupling of physical properties, lithological characteristics and microscopic pore inhomogeneity, and the fluid motility of larger pore sizes in cores significantly affects the fluid motility of cores; the fluid motility of different types of cores mainly occurs in P1-2 and P1-3 pores, and the amounts of these two types of pores and the amounts of their movable fluids determine the fluid motility of cores The pore structure coefficient and fluid motility coefficient have certain advantages in quantitative characterization of fluid motility, and the complexity of pore structure and fluid motility of P1-2 and P1-3 pores ultimately determine the fluid motility of cores.
Peng LIU , Bin PENG , RuiJiang YU , Ting LI , Hui GAO , Teng LI . Research on the characteristics of fluid mobility of the tight reservoir with the NMR fluid distribution pore classification method[J]. Progress in Geophysics, 2025 , 40(1) : 294 -303 . DOI: 10.6038/pg2025HH0266
图1 不同类型岩心饱和蒸馏水核磁共振T2谱图Fig 1 The NMR T2 spectra of different types of tight sandstone core samples under saturated distilled water |
表1 典型致密砂岩岩心物性测试结果Table 1 The results of the properties of the typical tight core samples |
| 物性参数 | Ⅰ型 | Ⅱ型 | Ⅲ型 | |
|---|---|---|---|---|
| 长度/mm | 24.95 | 24.94 | 24.96 | |
| 直径/mm | 49.58 | 50.06 | 49.68 | |
| 孔隙度/% | 4.62 | 11.27 | 2.88 | |
| 渗透率/10-3μm2 | 0.0128 | 1.1057 | 0.0032 | |
| 全岩矿物含量 | 石英/% | 45.50 | 30.00 | 40.20 |
| 长石/% | 26.10 | 31.80 | 29.40 | |
| 方解石/% | 11.80 | 23.10 | 4.60 | |
| 黏土矿物/% | 16.60 | 15.10 | 25.80 | |
| 黏土矿物含量 | 伊蒙混层/% | 12.00 | 33.00 | 9.00 |
| 伊利石/% | 33.00 | 31.00 | 15.00 | |
| 高岭石/% | 22.00 | 10.00 | 25.00 | |
| 绿泥石/% | 33.00 | 26.00 | 51.00 | |
| 高压压汞参数 | 排驱压力/MPa | 7.8022 | 1.7537 | 38.4739 |
| 平均孔喉半径/μm | 0.029 | 0.082 | 0.012 | |
| 均质系数 | 0.247 | 0.159 | 0.217 | |
| 分选系数 | 0.022 | 0.079 | 0.008 | |
| 退汞效率/% | 36.01 | 30.21 | 39.73 | |
图3 不同类型岩心流体分布孔隙初步划分(a)Ⅰ型岩心;(b)Ⅱ型岩心;(c)Ⅲ型岩心. Fig 3 The primary classification of pores for the distribution of fluid in various types of tight sandstone core samples (a) Type I core; (b) Type II core; (c) Type III core. |
图4 不同类型岩心流体分布孔隙精细划分(a)Ⅰ型岩心;(b)Ⅱ型岩心;(c)Ⅲ型岩心. Fig 4 The refined classification of pores for the distribution of fluid in various types of tight sandstone core samples (a) Type I core; (b) Type II core; (c) Type III core. |
感谢审稿专家提出的修改意见和编辑部的大力支持!
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