DCO Project Summary

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Project Title
Subsurface Microbial Contribution to Dark CO2 Fixation in Geological Storage Sites
Start DateEnd Date
2014-07-01 2014-12-31
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The relatively recently discovered microbial communities inhabiting the Earth subsurface are still poorly studied but have to be considered as important contributors to the global C, N, and S cycles, notably in basalts where high diversity was revealed. With the aim of understanding the diversity and dynamics of microbial communities in the basalt hosted aquifers of Hellisheidi (SW Iceland), our research group has been monitoring the microbial diversity in the different available deep wells since 2008, using bacterial and archaeal 16s rRNA gene cloning, 454-pyrosequencing (hypervariable regions V1-V3) and qPCR. The Hellisheidi site has different strategically located wells, used by Reykjavik Energy, the operator of the associated geothermal plant that has been performing CO2 and CO2-H2-H2S injections at a depth of 400800 m and temperatures up to ~80°C as mitigation strategy for its main waste products. It provides the unique opportunity to benefit from a large-scale injection experiment mimicking natural processes. The basaltic injection site can accordingly be seen as an observatory of the oceanic crust that encounters similar CO2/H2S-rich fluid percolation, over larger periods of time. Our objective is to understand the microbial communities function and response to pure CO2/CO2-H2-H2S injections in relation to C, S, and N cycles through metagenomics analysis.

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Reporting Year 2014 Click to expand

  • RY2014-1 - submitted on Aug 31, 2014

    Update Details:

    Samples will soon arrive at the MBL for DNA sequencing.

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