Convert Micrometre squared to Millidarcy
Convert Micrometre squared (µm²) to Millidarcy (mD) instantly and accurately.
Conversion Formula
mD = µm² × 1013.25
About Micrometre squared
The micrometre squared (µm²) equals 10⁻¹² m², the SI-consistent permeability unit used in European reservoir standards and ISO documents. 1 µm² ≈ 1.0133 D - numerically close to but distinct from the darcy. Clean gravel: 1-10 µm²; clean sandstone: 10⁻³-0.1 µm². 1 µm² = 10⁶ nm² = 10⁻⁶ mm².
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
| Micrometre squared (µm²) | Millidarcy (mD) |
|---|---|
| 1 µm² | 1013.25 mD |
| 2 µm² | 2026.5 mD |
| 5 µm² | 5066.25 mD |
| 10 µm² | 10132.5 mD |
| 25 µm² | 25331.2 mD |
| 50 µm² | 50662.5 mD |
| 100 µm² | 101325 mD |