Appendix J
Commonly Used Units in Different Unit Systems
| Parameters | Basic Units of SI | China Statutory Units | Darcy Units | Imperial Field Units |
| Pressure, p, pe, pi, po, pR, psc, pw, pws, pwf, Δp, Δps, ΔpM | Pa or kPa | MPa | atm | psi |
| Pseudo pressure, m | Pa2/(Pa.s) | MPa2/(mPa.s) | atm2/cP | psi2/cP |
| Normalized pseudo pressure, pp | Pa or kPa | MPa | atm | psi |
| Gas flow rate, q, qAOF, qsc | m3/s or m3/d | 104 m3/d | cm3/s | MMscfd |
| Oil or other liquid flow rate, qo, qw | m3/s or m3/d | m3/d | cm3/s | bbl/d |
| Cumulative oil production, Np | m3 | 104 m3 | cm3 | bbl |
| Cumulative gas production, Gp | m3 | 104 m3 | cm3 | MMscf |
| OOIP, N | m3 | 108 m3 | cm3 | bbl |
| OGIP, G | m3 | 108 m3 | cm3 | MMscf |
| Time, t, tM, tp, tps, tss, tc, tca, Δt, ΔtM, ΔtP, ΔtC | s or h | h | s | h |
| Thickness, h | m | m | cm | ft |
| Distance, L, r, re, ri, rf, rM, rw, rwe | m | m | cm | ft |
| Area, A | m2 | m2 or km2 | cm2 | ft2 |
| Permeability, k, kh, kv, kr, |
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