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Groundwater flow characterization in a fractured bedrock aquifer using active DTS tests in sealed boreholes

Journal Article · · Journal of Hydrology
 [1];  [2];  [2];  [3]
  1. Univ. of Guelph, ON (Canada); Silixa Ltd. (United Kingdom); University of Wisconsin-Madison
  2. Univ. of Guelph, ON (Canada)
  3. Silixa Ltd. (United Kingdom)
In recent years, wireline temperature profiling methods have evolved to offer new insight into fractured rock hydrogeology. Important advances in wireline temperature logging in boreholes make use of active line source heating alone and then in combination with temporary borehole sealing with flexible impervious fabric liners to eliminate the effects of borehole cross-connection and recreate natural flow conditions. Here, a characterization technique was developed based on combining fiber optic distributed temperature sensing (DTS) with active heating within boreholes sealed with flexible borehole liners. DTS systems provide a temperature profiling method that offers significantly enhanced temporal resolution when compared with conventional wireline trolling-based techniques that obtain a temperature–depth profile every few hours. The ability to rapidly and continuously collect temperature profiles can better our understanding of transient processes, allowing for improved identification of hydraulically active fractures and determination of relative rates of groundwater flow. Here, the advantage of a sealed borehole environment for DTS-based investigations is demonstrated through a comparison of DTS data from open and lined conditions for the same borehole. Evidence for many depth-discrete active groundwater flow features under natural gradient conditions using active DTS heat pulse testing is presented along with high resolution geologic and geophysical logging and hydraulic datasets. Implications for field implementation are discussed.
Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office
Grant/Contract Number:
EE0006760
OSTI ID:
1638783
Journal Information:
Journal of Hydrology, Journal Name: Journal of Hydrology Journal Issue: C Vol. 528; ISSN 0022-1694
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Investigating Water Movement Within and Near Wells Using Active Point Heating and Fiber Optic Distributed Temperature Sensing journal March 2018
A field study on the application of distributed temperature sensing technology in thermal response tests for borehole heat exchangers journal November 2018
Estimation of the Variation in Specific Discharge Over Large Depth Using Distributed Temperature Sensing (DTS) Measurements of the Heat Pulse Response journal January 2019
Groundwater Flow Quantification in Fractured Rock Boreholes Using Active Distributed Temperature Sensing Under Natural Gradient Conditions journal April 2019
Using stable water isotopes to identify spatio-temporal controls on groundwater recharge in two contrasting East African aquifer systems journal April 2018
Multiple lines of field evidence to inform fracture network connectivity at a shale site contaminated with dense non-aqueous phase liquids
  • Parker, Beth L.; Chapman, Steven W.; Goldstein, Kenneth J.
  • Geological Society, London, Special Publications, Vol. 479, Issue 1 https://doi.org/10.1144/sp479.8
journal April 2018
Temperature log simulations in high-enthalpy boreholes journal November 2019
A Comparison of Different Methods to Estimate the Effective Spatial Resolution of FO-DTS Measurements Achieved during Sandbox Experiments journal January 2020
Temperature log simulations in high-enthalpy boreholes text January 2019

Figures / Tables (11)


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