Transient changes in fracture aperture during hydraulic well tests in fractured gneiss
Author(s)
Schweisinger, Todd
Svenson, E.
Murdoch, L.C.
Advisor(s)
Editor(s)
Hatcher, Kathryn J.
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Abstract
The influence of deformable fractures on aquifer tests is studied by the development of a technique to measure and analyze in-situ changes in fracture aperture. A high-resolution borehole extensometer is used to measure the axial displacement of a borehole during packed-off hydraulic well tests in fractured rock. The extensometer yields repeatable displacements ranging from less than 0.5 microns/(meter of head) to 5 microns/meter depending on the testing location. The field measurements are interpreted using a theoretical analysis that couples elastic deformation and fluid flow in the fracture. Basic measurements from a single well can be interpreted to estimate transmissivity and storativity as functions of depth.
Sponsor
Sponsored by:
Georgia Environmental Protection Division
U.S. Geological Survey, Georgia Water Science Center
U.S. Department of Agriculture, Natural Resources Conservation Service
Georgia Institute of Technology, Georgia Water Resources Institute
The University of Georgia, Water Resources Faculty
Date
2005-04
Extent
Resource Type
Text
Resource Subtype
Proceedings