Abstract
Carbon capture and sequestration(CCS) is nowadays regarded as a strategic approach to reduce atmospheric CO2,among which CO2storage in oil reservoir is one of the reliable technologies.However,it is yet not clear whether the stored CO2 can be reduced to CH4 via methanogenesis in oil reservoir.An investigation was thus conducted with a oil production mixture sampled from Qinghai Oilfield in which HCO3-was added to mimic CO2storage in oil reservoir.The result revealed that HCO3addition led to the detection of more relative contents of methanogenic archaea and CH4,along with degradation of aromatic hydrocarbons and asphaltenes,suggesting sequestrated CO2 in Qinghai Oilfield could be transformed to CH4,and resulting in enhanced oil recovery.
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