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Table 4 Regression coefficients of multiple regression models of the variable λm for air- and water-saturated sandstones
Pore fluid | Variable/predicator | Coefficient | Standard error | t value | p value | R 2 |
|---|---|---|---|---|---|---|
Air | Intercept | 1.74 | 0.56 | 3.11 | 2.22 × 10−3 | 0.65 |
Porosity | 0.079 | 0.010 | 7.85 | 4.66 × 10−13 | ||
Quartz | 0.0410 | 0.0057 | 7.18 | 2.12 × 10−11 | ||
Alkali feldspar | − 0.044 | 0.014 | − 3.22 | 1.55 × 10−3 | ||
Kaolinite | 0.117 | 0.026 | 4.46 | 1.48 × 10−5 | ||
Dolomite | 0.0226 | 0.0086 | 2.64 | 8.99 × 10−3 | ||
Water | Intercept | 1.53 | 0.37 | 4.08 | 6.97 × 10−5 | 0.72 |
Porosity | 0.022 | 0.0065 | 3.31 | 1.15 × 10−3 | ||
Quartz | 0.048 | 0.0038 | 12.54 | 2.0 × 10−16 | ||
Alkali feldspar | − 0.023 | 0.0090 | − 2.51 | 1.31 × 10−2 | ||
Kaolinite | 0.055 | 0.017 | 3.26 | 1.36 × 10−3 | ||
Dolomite | 0.025 | 0.0056 | 4.51 | 1.23 × 10−5 | ||
Siderite | − 0.29 | 0.12 | − 2.51 | 1.30 × 10−2 |