Research on Microbial Methanogenesis in CO2 Storage in a Low Temperature Oil Reservoir

Summary This study presents a preliminary assessment of the capacity of reservoir microorganisms in a low-temperature oil reservoir to convert CO2 into methane after CO2 injected. This study revealed the stimulatory effect of CO2 on methane production. The findings demonstrate that shallow reservoirs possess hydrogenotrophic methanogenic potential via the CO2 utilization pathway, characterized by the presence of typical hydrogenotrophic methanogenic bacteria and archaea within the microbial community. During anaerobic degradation processes involving alkanes, medium-chain alkanes exhibit preferential selectivity. This research holds significant theoretical implications for future on-site applications of CO2 storage in oil fields. Our investigation sheds light on microbial methanogenesis associated with CO2 storage in low-temperature oil reservoirs, which is crucial for advancing underground CCS.