Convert Nanodarcy to Millidarcy
Convert Nanodarcy (nD) to Millidarcy (mD) instantly and accurately.
Conversion Formula
mD = nD × 1.000000000e-6
About Nanodarcy
The nanodarcy (nD) equals 10⁻⁹ D ≈ 9.869 × 10⁻²² m², the standard permeability unit for ultra-tight unconventional reservoirs. Barnett, Marcellus, and Eagle Ford shale matrix: 1-1 000 nD; crystalline basement rocks and caprocks: below 1 nD. Measured by pulse-decay or GRI crushed-rock methods. 1 nD = 10⁻³ µD = 10⁻⁶ mD.
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
| Nanodarcy (nD) | Millidarcy (mD) |
|---|---|
| 1 nD | 1 × 10-6 mD |
| 2 nD | 2 × 10-6 mD |
| 5 nD | 5 × 10-6 mD |
| 10 nD | 1 × 10-5 mD |
| 25 nD | 2.5 × 10-5 mD |
| 50 nD | 5 × 10-5 mD |
| 100 nD | 1 × 10-4 mD |