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The concept and connotation of microbial/chemical/gas flooding synergistic EOR technology are expounded from three aspects: material synergy, mechanism synergy and space-time synergy.The mechanism, characteristics and development status of microbial/chemical flooding synergistic oil displacement technology (microbial activated water flooding, microbial/chemical profile control, microbial/chemical flooding combined oil displacement） and microbial/gas flooding synergistic oil displacement technology (air assisted microbial oil displacement, microbial/CO2 synergistic oil displacement） are summarized, in the future, we will continue to explore the micro synergy mechanism, green and low-carbon technology, and expand the scope of application of the reservoir. [ABSTRACT FROM AUTHOR]