Abstract
Thermal conductivity is an important physical parameter of rock, which requires indirect estimates. The existing rock thermal conductivity prediction model established from the perspective of particles has certain limitations, and the thermal conductivity calculation of sedimentary rock is not paid enough attention. In this paper, the thermal conductivity of 36 sedimentary samples is tested by the optical scanning method at a temperature of 300 K, and the calculated values from eight commonly used thermal conductivity prediction models with values obtained from laboratory tests are compared. A new mathematical model called the thermal conductivity entropy model (TCEM) is proposed to calculate the thermal conductivity of the rock from its mineral composition. The models for sandstone and mudstone by using thermal conductivity of the individual minerals are optimized, and the deviations between the measured and calculated values are compared. The results show that the values calculated by the eight models are all smaller than the test values, while the relative deviation of sandstone and mudstone are about 10% and 15%, respectively. TCEM provides a good coupling relationship (R2 = 0.54) for low-porosity sandstone. Due to the metamorphism of internal minerals, the thermal conductivity entropy is not linearly related to thermal conductivity. Therefore, the thermal conductivity entropy of minerals is used to predict the thermal conductivity of mudstone by multiple linear fitting (R2 = 0.62). TCEM eliminates the deviation caused by the spatial distribution of mineral particles in the rock in the traditional model.
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This work was supported by the National Natural Science Foundation of China (41872170/41572140) and the National Major Science and Technology Projects of China (2016ZX05044).
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Appendix: Mineral Composition and Thermal Conductivity Values of the Samples
Appendix: Mineral Composition and Thermal Conductivity Values of the Samples
Sandstone | |||||||||
---|---|---|---|---|---|---|---|---|---|
Sample | Thermal conductivity (W m−1 k−1) | Quartz (%) | Plagioclase (%) | Calcite (%) | Dolomite (%) | Siderite (%) | Rutile (%) | Clay (%) | Others (%) |
Q1929196 | 2.8951 | 11.41 | 38.29 | 4.40 | 0.00 | 0.00 | 0.00 | 20.80 | 25.11 |
Q1929197 | 4.3354 | 29.52 | 0.00 | 0.00 | 9.15 | 43.63 | 0.00 | 17.70 | 0.00 |
Q1929201 | 3.8126 | 14.16 | 8.60 | 0.00 | 16.21 | 4.37 | 5.43 | 51.22 | 0.00 |
Q1929202 | 3.3597 | 11.72 | 4.21 | 22.58 | 32.69 | 4.28 | 0.00 | 24.53 | 0.00 |
Q1929209 | 2.9738 | 7.36 | 35.26 | 0.00 | 8.79 | 4.22 | 0.00 | 44.36 | 0.00 |
Q1929211 | 3.9728 | 40.44 | 3.15 | 2.05 | 15.83 | 0.00 | 3.32 | 31.65 | 3.55 |
Q1929213 | 3.6175 | 14.72 | 0.00 | 0.00 | 0.00 | 40.22 | 1.53 | 43.54 | 0.00 |
Q1929215 | 3.1660 | 22.01 | 6.52 | 4.24 | 15.35 | 12.52 | 1.37 | 38.00 | 0.00 |
Q1929219 | 4.0005 | 20.69 | 10.21 | 9.97 | 0.00 | 24.61 | 1.43 | 33.08 | 0.00 |
Q1929220 | 3.1700 | 15.30 | 11.87 | 0.00 | 20.33 | 10.24 | 1.36 | 40.90 | 0.00 |
Q1929223 | 3.0058 | 15.49 | 0.00 | 0.00 | 0.00 | 32.70 | 1.49 | 50.32 | 0.00 |
Q1929225 | 2.5427 | 13.71 | 35.39 | 8.13 | 0.00 | 0.00 | 0.00 | 36.43 | 6.33 |
Q1929226 | 3.5723 | 11.62 | 29.20 | 25.46 | 0.00 | 0.00 | 0.00 | 27.37 | 6.34 |
Q1929228 | 2.6476 | 16.34 | 49.38 | 0.00 | 0.00 | 0.00 | 0.00 | 34.29 | 0.00 |
Q1929229 | 2.7087 | 15.37 | 28.17 | 3.17 | 0.00 | 0.00 | 0.00 | 37.92 | 15.37 |
Q1929230 | 4.1490 | 50.10 | 6.31 | 0.00 | 0.00 | 7.85 | 1.99 | 33.75 | 0.00 |
Q1929232 | 4.0400 | 36.14 | 9.44 | 6.15 | 12.85 | 3.56 | 3.31 | 28.55 | 0.00 |
Q1929233 | 2.9500 | 19.47 | 11.31 | 0.00 | 0.00 | 19.16 | 5.00 | 45.06 | 0.00 |
Mudstone | |||||||
---|---|---|---|---|---|---|---|
Sample | Thermal conductivity (W m−1 k−1) | Quartz (%) | Plagioclase (%) | Siderite (%) | Rutile (%) | Clay (%) | Others (%) |
M1929198 | 1.4927 | 16.89 | 5.21 | 0.00 | 3.95 | 73.95 | 0.00 |
M1929199 | 3.9743 | 11.56 | 30.07 | 1.41 | 1.97 | 53.43 | 1.57 |
M1929200 | 3.9699 | 9.55 | 17.81 | 2.13 | 3.31 | 67.20 | 0.00 |
M1929203 | 3.0160 | 16.11 | 13.78 | 3.59 | 0.00 | 57.70 | 8.82 |
M1929204 | 4.0311 | 24.35 | 7.31 | 6.38 | 0.00 | 61.96 | 0.00 |
M1929205 | 2.5616 | 10.61 | 19.90 | 2.84 | 0.00 | 61.10 | 5.55 |
M1929206 | 2.1393 | 8.69 | 0.00 | 0.00 | 3.39 | 78.19 | 9.73 |
M1929207 | 3.2257 | 14.64 | 10.32 | 2.80 | 0.00 | 72.24 | 0.00 |
M1929208 | 3.0291 | 25.63 | 3.16 | 5.00 | 2.66 | 63.54 | 0.00 |
M1929210 | 3.3495 | 13.53 | 8.22 | 1.39 | 0.00 | 76.87 | 0.00 |
M1929212 | 2.4612 | 13.60 | 17.55 | 0.00 | 2.61 | 66.24 | 0.00 |
M1929216 | 4.1505 | 21.72 | 10.72 | 5.09 | 2.03 | 53.14 | 7.30 |
M1929217 | 2.5908 | 24.91 | 7.48 | 10.15 | 1.35 | 56.11 | 0.00 |
M1929221 | 3.0189 | 15.95 | 0.00 | 0.00 | 13.50 | 61.20 | 9.35 |
M1929222 | 2.6272 | 13.16 | 6.49 | 0.00 | 2.73 | 62.07 | 15.55 |
M1929224 | 3.0539 | 15.55 | 5.48 | 4.46 | 3.46 | 58.61 | 12.44 |
M1929227 | 3.9364 | 25.69 | 0.00 | 11.96 | 5.57 | 56.79 | 0.00 |
M1929231 | 3.2534 | 7.09 | 0.00 | 20.56 | 8.84 | 63.50 | 0.00 |
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Jiang, X., Wu, C., Fang, X. et al. A New Thermal Conductivity Estimation Model for Sandstone and Mudstone Based on Their Mineral Composition. Pure Appl. Geophys. 178, 3971–3986 (2021). https://doi.org/10.1007/s00024-021-02824-w
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DOI: https://doi.org/10.1007/s00024-021-02824-w