Recent Advance of Microbial Enhanced Oil Recovery (MEOR) in China

Table 2

CNPC MEOR reservoir screening parameter [5].

Parameter	Value range	Optimum
Formation temperature (°C)	20-80	30-60
Crude viscosity (mPa·s)	10-500	30-150
Permeability (mD)	≥50	≥ 150
Porosity (%)	12-25	17-25
Brine salinity (g/L)	≥300	≥100
Wax content (%)	≥4	≥7
Water cut (%)	40-95	60-85
Total bacterial concentration in produced fluid (number/mL)	≥100	≥1000