Table 5.

The features of different MEOR technologies.

Types	Features	Limitations	Reference
MFR	Wide range of action Long duration	Only suitable for specific reservoir environments	Liu et al. (2005)
MSPR	Plugging high permeability areas	May block other seepage channel	Bi et al., (2016), Bi et al. (2019)
CMR	Low cost Reusable	Only suitable for single well	Gao (2018)
MWR	Wellbore wax removal and wax prevention	/	She et al. (2019)
GEMEOR	Combining the characteristics of dominant bacteria to construct new strain	High difficulty in operation	Niu et al. (2020)
EEOR	Low cost of application Reusable	High cost of production	Aurepatipan et al. (2018)