Abstract：
:Deep subsurface formations (for example, high-temperature oil reservoirs) are candidate sites for carbon capture and storage technology. However, very little is known about how the subsurface microbial community would respond to an increase in CO2 pressure resulting from carbon capture and storage. Here we construct microcosms mimicking reservoir conditions (55 °C, 5 MPa) using high-temperature oil reservoir samples. Methanogenesis occurs under both high and low CO2 conditions in the microcosms. However, the increase in CO2 pressure accelerates the rate of methanogenesis to more than twice than that under low CO2 conditions. Isotope tracer and molecular analyses show that high CO2 conditions invoke acetoclastic methanogenesis in place of syntrophic acetate oxidation coupled with hydrogenotrophic methanogenesis that typically occurs in this environment (low CO2 conditions). Our results present a possibility of carbon capture and storage for enhanced microbial energy production in deep subsurface environments that can mitigate global warming and energy depletion.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Mayumi D,Dolfing J,Sakata S,Maeda H,Miyagawa Y,Ikarashi M,Tamaki H,Takeuchi M,Nakatsu CH,Kamagata Ydoi
10.1038/ncomms2998subject
Has Abstractpub_date
2013-01-01 00:00:00pages
1998issn
2041-1723pii
ncomms2998journal_volume
4pub_type
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