Nutrient Stimulation of Indigenous Microorganisms for Oil-in-Water Emulsion in a Medium Temperature Petroleum Reservoir with Ca²⁺-Rich Brine

Table 1

Stimulation formulas.

Formulas	Corn steep powder (%)	Molasses (%)	NaNO3 (%)	NH4Cl (%)	Crude oil (%)	CH3COONa (%)	Soybean powder (%)
OR	—	—	—	—	—	—	—
OC	—	—	0.6	0.25	2	0.25	—
OCN	—	0.25	0.6	0.25	2	—	—
ONP1	0.15	—	0.6	0.25	2	—	—
ONP2	—	—	0.6	0.25	2	—	0.25
FN1	0.15	—	0.6	/	2	0.25	—
FN2	0.15	—	0.6	0.25	2	0.25	—

OR used as the control, referred to the original oil production water without nutrient addition.