A 4D Cross-Borehole Direct Current Resistivity System for Monitoring In-Situ Groundwater Remediation

Liu, Lichao; Auken, Esben; Domenzain, Diego; Maurya, P.K.; Bording, T.S.; Bjerre, B.; Vela, I.; Christiansen, A.V.

doi:10.3997/2214-4609.202220117

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Processing Time-Domain Induced Polarization Data Using Variational Mode Decomposition

Naveed,

Madsen,

Grombacher

et al. 2024

IEEE Trans. Geosci. Remote Sensing

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Processing Time-Domain Induced Polarization Data Using Variational Mode Decomposition

Naveed,

Madsen,

Grombacher

et al. 2024

IEEE Trans. Geosci. Remote Sensing

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3D DC inversion, visualization, and processing of dense time-lapse data in fine domains applied to remediation monitoring

Domenzain

Liu

Vela³

et al. 2023

GEOPHYSICS

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Using electrical direct-current (DC) data to monitor the subsurface is an efficient solution for observing changes in the shallow subsurface. Recent advances in instrumentation enable the acquisition of large data sets over 3D domains in a reasonable time. We have developed an inversion approach capable of handling very large amounts of data on a finely discretized domain, which enables the delivery of time-lapse results of dense data acquisitions in a feasible time and with high resolution. To spatially represent 3D DC data, a visualization method is introduced that formally generalizes the focusing point of a common pseudo-section in three dimensions. The method physically describes subsurface properties for simple geologic scenarios. In addition, the focusing points are used to design our 3D measuring protocol. We develop a DC data processing scheme using the full time-domain induced polarization (IP) waveform data by applying two novel physics-based criteria that enforce charge buildup and steady-state. These criteria are tested on DCIP field data and find that 98% of the filtered DC data have less than 1% relative error. The 3D visualization method and inversion algorithm are evaluated on synthetic scenarios of 3D DC dense borehole data. Then, we indicate time-lapse results of DC field data acquired at an uncontaminated site where a remediation agent was injected at depth. The data were acquired with a new DCIP instrument capable of measuring dense data sets at fast acquisition times. Accounting for DCIP data acquisition, signal processing, and 3D inversion of 60k DC measurements, our results locate in 14 h the 3D spread of the remediation agent in a 5 km3 volume.

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3D DC survey design for electrodes at the surface

Domenzain

2024

Fourth International Meeting for Applied Geoscience &Amp; Energy

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A 4D Cross-Borehole Direct Current Resistivity System for Monitoring In-Situ Groundwater Remediation

Cited by 3 publications

References 0 publications

Processing Time-Domain Induced Polarization Data Using Variational Mode Decomposition

Processing Time-Domain Induced Polarization Data Using Variational Mode Decomposition

3D DC inversion, visualization, and processing of dense time-lapse data in fine domains applied to remediation monitoring

3D DC survey design for electrodes at the surface

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