TY - GEN
T1 - Electrical signatures of dual domain mass transfer observed in rock cores
AU - Slater, L.
AU - Day-Lewis, F.
AU - Parker, B.
AU - Slater, L.
N1 - Funding Information: This material is based upon work supported by the U.S. Army Corps of Engineers, Humphreys Engineer Center Support Activity under Contract No. W912HQ-14-C-0018, the U.S. Department of Defense Strategic Environmental Research and Development Program (ER-2421), and the U.S. Geological Survey Toxic Substances Hydrology Program. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Publisher Copyright: © 1st Conference on Hydrogeophysics: Contribution to Exploration and Management of Groundwater, Land-Use and Natural Hazards under a Changing Climate, Held at Near Surface Geoscience Conference and Exhibition 2021, NSG 2021.
PY - 2021
Y1 - 2021
N2 - Dual domain mass transfer (DDMT), or the transfer of solute between mobile and less-mobile porosity domains, can cause anomalous breakthrough behavior observed during pumping operations. One novel method for characterizing DDMT is through geoelectrical inference, whereby electrical geophysical measurements are combined with pore fluid specific conductance measurements during a tracer experiment. Studies have shown the effectiveness of this method for characterizing DDMT in unconsolidated materials. We describe first of a kind instrumentation and results aimed at investigating evidence for a geoelectrical signature of DDMT in a rock core. A flow through apparatus was designed with the capability to simultaneously acquire bulk conductivity and specific conductance measurements on fluids extracted from the center of the core. A tracer experiment was run in three phases: initial, tracer flush, and tracer injection. Both specific conductance and bulk conductivity time series exhibit characteristic breakthrough behavior, with a delayed breakthrough of bulk conductivity relative to specific conductance, indicative of DDMT in the core. A strong hysteresis loop in the plot of bulk conductivity versus specific conductance is observed, consistent with the electrical geophysical signature of DDMT. The occurrence of DDMT at the core-scale indicates that it is likely ubiquitous within porous media across multiple scales.
AB - Dual domain mass transfer (DDMT), or the transfer of solute between mobile and less-mobile porosity domains, can cause anomalous breakthrough behavior observed during pumping operations. One novel method for characterizing DDMT is through geoelectrical inference, whereby electrical geophysical measurements are combined with pore fluid specific conductance measurements during a tracer experiment. Studies have shown the effectiveness of this method for characterizing DDMT in unconsolidated materials. We describe first of a kind instrumentation and results aimed at investigating evidence for a geoelectrical signature of DDMT in a rock core. A flow through apparatus was designed with the capability to simultaneously acquire bulk conductivity and specific conductance measurements on fluids extracted from the center of the core. A tracer experiment was run in three phases: initial, tracer flush, and tracer injection. Both specific conductance and bulk conductivity time series exhibit characteristic breakthrough behavior, with a delayed breakthrough of bulk conductivity relative to specific conductance, indicative of DDMT in the core. A strong hysteresis loop in the plot of bulk conductivity versus specific conductance is observed, consistent with the electrical geophysical signature of DDMT. The occurrence of DDMT at the core-scale indicates that it is likely ubiquitous within porous media across multiple scales.
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U2 - 10.3997/2214-4609.202120017
DO - 10.3997/2214-4609.202120017
M3 - Conference contribution
T3 - 1st Conference on Hydrogeophysics: Contribution to Exploration and Management of Groundwater, Land-Use and Natural Hazards under a Changing Climate, Held at Near Surface Geoscience Conference and Exhibition 2021, NSG 2021
BT - 1st Conference on Hydrogeophysics
PB - EAGE Publishing BV
T2 - 1st Conference on Hydrogeophysics: Contribution to Exploration and Management of Groundwater, Land-Use and Natural Hazards under a Changing Climate, Held at Near Surface Geoscience Conference and Exhibition 2021, NSG 2021
Y2 - 29 August 2021 through 2 September 2021
ER -