Rapid microbial methanogenesis during CO 2 storage in hydrocarbon reservoirs.

Autor: Tyne RL; Department of Earth Sciences, University of Oxford, Oxford, UK. rebecca.tyne@earth.ox.ac.uk., Barry PH; Department of Earth Sciences, University of Oxford, Oxford, UK. pbarry@whoi.edu.; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, USA. pbarry@whoi.edu., Lawson M; ExxonMobil Upstream Business Development, Spring, TX, USA. miclawson@gmail.com.; Aker BP, Stavanger, Norway. miclawson@gmail.com., Byrne DJ; CRPG-CNRS, Université de Lorraine, Nancy, France., Warr O; Department of Earth Sciences, University of Toronto, Toronto, Ontario, Canada., Xie H; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA., Hillegonds DJ; Department of Earth Sciences, University of Oxford, Oxford, UK., Formolo M; ExxonMobil Upstream Integrated Solutions, Spring, TX, USA., Summers ZM; ExxonMobil Research and Engineering Co., Virginia, NJ, USA., Skinner B; ExxonMobil Upstream Integrated Solutions, Spring, TX, USA., Eiler JM; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA., Ballentine CJ; Department of Earth Sciences, University of Oxford, Oxford, UK. chris.ballentine@earth.ox.ac.uk.
Jazyk: angličtina
Zdroj: Nature [Nature] 2021 Dec; Vol. 600 (7890), pp. 670-674. Date of Electronic Publication: 2021 Dec 22.
DOI: 10.1038/s41586-021-04153-3
Abstrakt: Carbon capture and storage (CCS) is a key technology to mitigate the environmental impact of carbon dioxide (CO 2 ) emissions. An understanding of the potential trapping and storage mechanisms is required to provide confidence in safe and secure CO 2 geological sequestration 1,2 . Depleted hydrocarbon reservoirs have substantial CO 2 storage potential 1 , 3 , and numerous hydrocarbon reservoirs have undergone CO 2 injection as a means of enhanced oil recovery (CO 2 -EOR), providing an opportunity to evaluate the (bio)geochemical behaviour of injected carbon. Here we present noble gas, stable isotope, clumped isotope and gene-sequencing analyses from a CO 2 -EOR project in the Olla Field (Louisiana, USA). We show that microbial methanogenesis converted as much as 13-19% of the injected CO 2 to methane (CH 4 ) and up to an additional 74% of CO 2 was dissolved in the groundwater. We calculate an in situ microbial methanogenesis rate from within a natural system of 73-109 millimoles of CH 4 per cubic metre (standard temperature and pressure) per year for the Olla Field. Similar geochemical trends in both injected and natural CO 2 fields suggest that microbial methanogenesis may be an important subsurface sink of CO 2 globally. For CO 2 sequestration sites within the environmental window for microbial methanogenesis, conversion to CH 4 should be considered in site selection.
(© 2021. The Author(s).)
Databáze: MEDLINE
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