Table 1. Characteristics of the Menggulin (MGL) and Ba19 blocks in Huabei Oilfield, China.
| Parameters | Block MGL | Block Ba19 |
| Oil Reservoir | ||
| Depth (m) | ∼806 | ∼1380 |
| Temperature (°C) | ∼37.0 | ∼58.4 |
| Pressure (MPa) | ∼7.46 | ∼13.8 |
| Porosity | ∼23.6 | ∼18.5 |
| Air permeability | ∼675.3 | ∼691.0 |
| Crude Oil | ||
| Viscosity in situ (mPa·s) | ∼179.1 | ∼13.68 |
| Element content (%) | S: 0.18; N: 0.38 | S: 0.18; N: 0.17 |
| Group composition (%) | saturates:38.94; aromatics:17.77;resins:24.47 asphaltenes: 18.83 | saturates: 44.25; aromatics: 27.86;resins: 16.48; asphaltenes: 11.42 |
| Geochemical parameter | Max-peak: nC21;ΣC21−/ΣC22+: 1.24;C(21+22)/C(28+29): 1.71;Pr/Ph: 0.89; Pr/nC17: 0.58;Ph/nC18: 0.72; CPI: 1.08; OEP:1.16 | Max-peak: nC21 or nC23; ΣC21−/ΣC22+: 1.05; C(21+22)/C(28+29): 1.74;Pr/Ph: 0.71; Pr/nC17: 0.59;Ph/nC18: 0.88; CPI: 1.12; OEP: 1.17 |
| Production water | ||
| Type | NaHCO3 | NaHCO3 |
| pH | 8.2–8.6 | 8.4–9.2 |
| Average salinity (mg/l) | ∼2224 | ∼4015 |
| Average S-TOC (mg/l) | ∼93 | ∼146 |
| Injection water | ||
| pH | 8.6–8.9 | 8.3–8.5 |
| Average salinity (mg/l) | ∼1965 | ∼3478 |
| Average S-TOC (mg/l) | ∼51 | ∼38 |