Convert Microdarcy to Millidarcy
Convert Microdarcy (µD) to Millidarcy (mD) instantly and accurately.
Conversion Formula
mD = µD × 0.001
About Microdarcy
The microdarcy (µD) equals 10⁻⁶ D ≈ 9.869 × 10⁻¹⁹ m², used for tight gas sands, coalbed methane matrix, and low-permeability carbonates. North Sea tight sandstones: 0.01-1 µD; coalbed methane matrix: 1-100 µD; mudrock caprocks: 0.001-1 µD. 1 µD = 10⁻³ mD = 10³ nD.
About Millidarcy
The millidarcy (mD) equals 10⁻³ D ≈ 9.869 × 10⁻¹⁶ m², the everyday unit in petroleum reservoir engineering worldwide. Conventional sandstone reservoirs: 1-1 000 mD; carbonate reservoirs: 0.1-100 mD; economic gas recovery typically requires k ≥ 0.1 mD. Permeameter and well-test reports give results in mD. 1 mD = 10⁻³ D = 10³ µD.
Quick Reference Table
| Microdarcy (µD) | Millidarcy (mD) |
|---|---|
| 1 µD | 0.001 mD |
| 2 µD | 0.002 mD |
| 5 µD | 0.005 mD |
| 10 µD | 0.01 mD |
| 25 µD | 0.025 mD |
| 50 µD | 0.05 mD |
| 100 µD | 0.1 mD |