Research Article
Analyzing the Origin of Low Resistivity in Gas-Bearing Tight Sandstone Reservoir
Table 2
Basic parameters used in mud filtrate invasion model.
| | Parameter | Value |
| | Fluid properties | Water density (g/cm3) | 1.05 | | Gas density (g/cm3) | 0.018 | | Water viscosity (cp) | 0.42 | | Gas viscosity (cp) | 0.024 | | Water compressibility (psi-1) | | | Formation water salinity (, ppm) | 10000 | | Mud filtrate salinity (, ppm) | 60000 |
| | Reservoir properties | Rock compressibility (psi-1) | | | Formation permeability (, mD) | 1 | | Formation porosity () | 0.085 | | Formation temperature (°C) | 122 | | Formation initial water saturation () | 0.3 | | Irreducible water saturation | 0.15 | | Residual gas saturation | 0.15 |
| | Archie equation | Cementation exponent, | 1.87 | | Saturation exponent, | 1.71 | | Lithology factor, | 1 |
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