Chinese Journal of Magnetic Resonance ›› 2021, Vol. 38 ›› Issue (2): 215-226.doi: 10.11938/cjmr20202856
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Kun MENG1,2,Sheng-jian WANG2,*(),Zong-an XUE2,Rui-qing HOU3,Liang XIAO1
Received:
2020-09-21
Online:
2021-06-05
Published:
2020-11-06
Contact:
Sheng-jian WANG
E-mail:wshj0908@163.com
CLC Number:
Kun MENG,Sheng-jian WANG,Zong-an XUE,Rui-qing HOU,Liang XIAO. Quantitative Evaluation of Shale Pore Structure Using Nuclear Magnetic Resonance Data[J]. Chinese Journal of Magnetic Resonance, 2021, 38(2): 215-226.
Table 1
Basic parameters of the 20 shale cores and multifractal parameters of their T2 spectra
编号 | 岩性 | Φ-nmr/% | T50/ms | 微孔/% | 中孔/% | 宏孔/% | Dmin* | Dmax* | D-1* | D1* | Δα* | Dmin-Dmax* | ||
1# | 黑色碳质页岩 | 2.02 | 0.598 | 0.376 | 48.681 | 50.942 | 1.236 | 0.293 | 1.097 | 0.762 | 1.026 | 0.943 | ||
2# | 黑色碳质页岩 | 1.19 | 0.604 | 0.638 | 48.506 | 50.856 | 1.167 | 0.378 | 1.072 | 0.838 | 0.854 | 0.789 | ||
3# | 黑色碳质页岩 | 0.86 | 0.257 | 1.026 | 65.735 | 33.239 | 1.231 | 0.227 | 1.111 | 0.669 | 1.071 | 1.004 | ||
4# | 黑色碳质页岩 | 2.19 | 0.542 | 0.338 | 51.067 | 48.595 | 1.235 | 0.313 | 1.100 | 0.765 | 1.006 | 0.923 | ||
5# | 黑色碳质页岩 | 2.08 | 0.769 | 0.367 | 44.567 | 55.065 | 1.199 | 0.457 | 1.066 | 0.873 | 0.854 | 0.742 | ||
6# | 黑色碳质页岩 | 1.11 | 0.327 | 0.585 | 61.891 | 37.524 | 1.238 | 0.229 | 1.115 | 0.679 | 1.076 | 1.009 | ||
7# | 黑色碳质页岩 | 1.07 | 0.378 | 0.636 | 58.550 | 40.814 | 1.231 | 0.312 | 1.095 | 0.777 | 0.999 | 0.919 | ||
8# | 黑色碳质页岩 | 1.99 | 0.307 | 0.723 | 62.884 | 36.393 | 1.232 | 0.266 | 1.106 | 0.724 | 1.036 | 0.965 | ||
9# | 黑色碳质页岩 | 1.69 | 0.421 | 0.252 | 57.065 | 42.684 | 1.246 | 0.262 | 1.112 | 0.709 | 1.053 | 0.984 | ||
10# | 灰黑色白云质页岩 | 1.87 | 0.115 | 2.348 | 70.629 | 27.023 | 1.320 | 0.275 | 1.126 | 0.719 | 1.136 | 1.046 | ||
11# | 灰黑色白云质页岩 | 2.56 | 0.360 | 1.105 | 57.662 | 41.233 | 1.220 | 0.288 | 1.090 | 0.757 | 1.024 | 0.931 | ||
12# | 灰黑色白云质页岩 | 2.15 | 0.344 | 0.713 | 59.893 | 39.394 | 1.226 | 0.308 | 1.101 | 0.759 | 0.998 | 0.919 | ||
13# | 灰黑色白云质页岩 | 1.69 | 0.151 | 0.884 | 85.168 | 13.948 | 1.370 | 0.224 | 1.168 | 0.603 | 1.235 | 1.146 | ||
14# | 灰黑色白云质页岩 | 1.28 | 0.141 | 1.658 | 80.521 | 17.820 | 1.328 | 0.238 | 1.140 | 0.662 | 1.177 | 1.090 | ||
15# | 灰黑色白云质页岩 | 2.10 | 0.253 | 0.835 | 66.570 | 32.595 | 1.236 | 0.270 | 1.109 | 0.721 | 1.031 | 0.966 | ||
16# | 灰黑色白云质页岩 | 1.10 | 0.167 | 1.436 | 69.717 | 28.846 | 1.310 | 0.232 | 1.118 | 0.675 | 1.188 | 1.078 | ||
17# | 灰黑色白云质页岩 | 0.89 | 0.183 | 1.333 | 59.503 | 39.165 | 1.324 | 0.253 | 1.122 | 0.703 | 1.180 | 1.071 | ||
18# | 灰黑色白云质页岩 | 3.17 | 0.102 | 1.960 | 87.002 | 11.037 | 1.364 | 0.217 | 1.171 | 0.607 | 1.228 | 1.147 | ||
19# | 灰黑色白云质页岩 | 1.75 | 0.210 | 0.589 | 74.234 | 25.177 | 1.337 | 0.264 | 1.136 | 0.695 | 1.169 | 1.073 | ||
20# | 灰黑色白云质页岩 | 2.55 | 0.149 | 0.945 | 79.074 | 19.981 | 1.359 | 0.260 | 1.148 | 0.682 | 1.200 | 1.100 |
Table 2
The distribution ranges and average values of the multifractal characteristic parameters of the three typesof pore structures in 20 shale cores
类型 | Dmin | Dmax | D-1 | D1 | Δα | Dmin-Dmax |
Ⅰ | 1.167~1.236 | 0.288~0.456 | 1.066~1.101 | 0.757~0.873 | 0.854~1.026 | 0.742~0.943 |
1.216 | 0.336 | 1.089 | 0.790 | 0.966 | 0.881 | |
Ⅱ | 1.231~1.245 | 0.227~0.270 | 1.106~1.115 | 0.669~0.724 | 1.031~1.075 | 0.965~1.009 |
1.237 | 0.251 | 1.111 | 0.700 | 1.053 | 0.986 | |
Ⅲ | 1.310~1.370 | 0.217~0.275 | 1.118~1.171 | 0.603~0.719 | 1.136~1.235 | 1.046~1.147 |
1.339 | 0.245 | 1.141 | 0.668 | 1.189 | 1.093 |
Table 3
The distribution ranges and average values of NMR porosity, T50 and pore ratio of the three types of pore structures in 20 shale samples
类型 | Φ-nmr/% | T50/ms | 微孔/% | 中孔% | 宏孔/% |
Ⅰ | 1.07~2.56 | 0.344~0.769 | 0.338~1.105 | 44.567~59.893 | 39.394~55.065 |
1.89 | 0.514 | 0.596 | 52.704 | 46.700 | |
Ⅱ | 0.86~2.10 | 0.253~0.421 | 0.252~1.026 | 57.065~66.570 | 32.595~42.684 |
1.55 | 0.313 | 0.684 | 62.829 | 36.487 | |
Ⅲ | 0.89~3.17 | 0.102~0.210 | 0.589~2.348 | 59.503~87.002 | 11.037~39.165 |
1.79 | 0.152 | 1.394 | 75.731 | 22.875 |
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