Plication Prospects of Reservoir Microorganisms in the Field of CCUS
CCUS is a key technology to address global environmental issues and an important way to achieve green and low-carbon development in the energy industry.At present,there are still some challenges in CCUS technology in the energy in-dustry,among which there are problems of serious gas escape and low replacement efficiency in CO2 replacement technolo-gy,and there are problems of surface leakage and low storage efficiency in CO2 storage,which are bottlenecks to the indus-trialization of CCUS technology in China.As the main site of CO2 replacement and storage,the subsurface environment of oil reservoirs is rich in microbial groups,and related institutions and researchers have conducted a lot of researches and confirmed through indoor simulations and field tests that microbial groups in the subsurface environment are involved in the process of CO2 underground circulation and storage in different ways.They can use the reservoir as an anaerobic reactor to promote CH4 conversion of CO2 through metabolic synergy;meanwhile,sulfate-reducing bacteria,iron-reducing bacteria,nitrate-reducing bacteria and other microorganisms commonly found in the reservoir participate in the CO2 storage process through the metabolic process of the bacteria,promoting structural,dissolution and mineralization sequestration.In addi-tion,some microorganisms can produce EPS and biofilm structure to seal large underground pores and fracture structure,which can improve the subsurface heterogeneity and solve the problem of cascade and CO2 sequestration leakage in the process of CO2 replacement,and greatly improve the efficiency of CO2 flooding and sequestration.Biotechnology is a green,low-carbon and low-cost technology,which plays an important role in different industries.Conducting research on the mechanism of interaction between CO2 and subsurface microorganisms and accelerating the application of microbial technol-ogy in the field of CCUS technology can effectively solve the technical bottleneck of key aspects of CCUS and improve the efficiency of all aspects of CCUS subsurface,which is very important for the development of CCUS technology.
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