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(2020) Assessing the Origin of Molecular Hydrogen in Bedrock Groundwaters

Silvennoinen J & Kietäväinen R


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08f: Room 3, Tuesday 23rd June 05:30 - 05:33

Joel Silvennoinen
Riikka Kietäväinen View abstracts at 8 conferences in series

Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.

Submitted by Barbara Sherwood Lollar on Saturday 20th June 18:58
Thank you for this really intriguing talk! It is fascinating to continue to see the structure (deep versus shallow) in the Pori borehole. Unlike other profiles where the gas compositions and isotope to some degree vary as function of lithological controls, the Pori borehole is primarily a homogeneous sandstone profile as shown in your figure. Do you think the variations observed as a function of gas sources from different depths” or perhaps changes in sinks at different depths? If I recall correctly there is a major fractured interval somewhere around 300m? Could the fractures be exerting control on the differences in geochemistry observed? Thank you – question posed by Barbara Sherwood Lollar (barbara.sherwoodlollar@utoronto.ca)

Submitted by Oliver Warr on Sunday 21st June 19:10
Hi, I really enjoyed your presentation. I was wondered if you had factored in any hydrogen consumption processes (such as sulfate reduction or methanogenesis into your model of production? I see that in several of your sites ~75% of the gas is methane. Considering a 4:1 H2 to CH4 production ratio this actually may represent the dominant reservoir of produced hydrogen, What effect this might have on the isotopes, your calculated production rates, and the implications for nuclear waste storage?

Submitted by Jethro Sanz-Robinson on Sunday 21st June 20:17
Do you have any measurements that would constrain the radiolytic production of Hydrogen at these sites (i.e. concentration of ragiogenic He, high concentrations of U/Th...)?

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