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Feasibility of Long-term Monitoring of Deep Hydrogeology with Flowing Fluid Electric Conductivity Logging Method
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (Geohydrology)ORCID iD: 0000-0003-0894-0809
Lawrence Berkeley National Laboratory. (Earth Sciences Division)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (Geohydrology)
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2015 (English)In: Dynamics of Fluids and Transport in Fractured-Porous Media / [ed] Faybishenko, B., Gale, J. and Benson, S., American Geophysical Union , 2015Chapter in book (Refereed)
Description
Abstract [en]

The flowing fluid electrical conductivity (FFEC) logging method has been used in deep boreholes to obtain estimates for the transmissivity, salinity of formation water, hydraulic head, and formation water flow rate of hydraulically conducting layers. In this paper, we proposed a modified FFEC logging procedure, involving a setup of a string of EC/T probes in the borehole, to passively monitor long-term temporal changes in local flow rates in a brine formation composed of multiple layers with different transmissivities over a period of months or years. The local flows in the layers can vary over time, for instance, as a result of seasonal or climatic changes. In the case of supercritical CO2 storage in the deep subsurface, the local flow pattern of the storage formation will be disturbed and furthermore it may change with time as the low density and low viscosity CO2 enters more and more into the transmissive layers and interacts with in situ water and rock. The present paper explores the possibility of using the FFEC method for such long-term monitoring in an observation well. The feasibility is demonstrated with field data from the Outokumpu test site in Finland.

Place, publisher, year, edition, pages
American Geophysical Union , 2015.
National Category
Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
URN: urn:nbn:se:uu:diva-239883OAI: oai:DiVA.org:uu-239883DiVA: diva2:775557
Available from: 2015-01-03 Created: 2015-01-03 Last updated: 2017-12-01

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Sharma, Prabhakar

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