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Publication Detail
A Tracer Methodology for Identifying Ambient Flows in Boreholes
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Maurice L, Barker JA, Atkinson TC, Williams AT, Smart PL
  • Publisher:
    WILEY-BLACKWELL
  • Publication date:
    03/2011
  • Pagination:
    227, 238
  • Journal:
    GROUND WATER
  • Volume:
    49
  • Issue:
    2
  • Print ISSN:
    0017-467X
  • Language:
    EN
  • Keywords:
    FRACTURE INFLOW PARAMETERS, FLUID CONDUCTIVITY LOGS, HYDRAULIC CONDUCTIVITY, DILUTION TESTS, CHALK AQUIFER, PERMEABILITY, WELL, INJECTION, ROCK, SHALE
  • Addresses:
    Maurice, L
    British Geol Survey
    Wallingford
    OX10 8BB
    Oxon
    England

    UCL
    Dept Earth Sci
    London
    WC1E 6BT
    England
Abstract
Identifying flows into, out of, and across boreholes is important for characterizing aquifers, determining the depth at which water enters boreholes, and determining the locations and rates of outflow. This study demonstrates how Single Borehole Dilution Tests (SBDTs) carried out under natural head conditions provide a simple and cheap method of identifying vertical flow within boreholes and determining the location of in-flowing, out-flowing, and cross-flowing fractures. Computer simulations were used to investigate the patterns in tracer profiles that arise from different combinations of flows. Field tracer tests were carried out using emplacements of a saline tracer throughout the saturated length of boreholes and also point emplacements at specific horizons. Results demonstrated that SBDTs can be used to identify flowing fractures at the top and bottom of sections of vertical flow, where there is a change in vertical flow rate within a borehole, and also where there are consistent decreases in tracer concentration at a particular depth. The technique enables identification of fractures that might be undetected by temperature and electrical conductance logging, and is a simple field test that can be carried out without pumping the borehole.
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