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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
from:
Chapter 17
Stress-dependent Flow in Fractured Rocks at Sellafield, United Kingdom
S. F. Rogers1
C. J. Evans
British Geological Survey
Keyworth, Nottingham, U.K.
1Currently with Golder Associates, Edwalton, Nottingham, U.K.
ABSTRACT
borehole
near Sellafield, west Cumbria, drilled as part of the United Kingdom's
radioactive-waste disposal program. In Nirex
borehole
RCF3, 100 short-interval tests were
carried out continuously over lengths of approximately 1.5 m. These tests provide a record
of a 160-m section of
borehole
with almost unprecedented control over the relationship
between permeability and fracture orientation. The data allow testing of the hypothesis
that the occurrence of flow is dependent on the state of stress. Shear and normal stresses
were calculated for all discontinuities identified from
borehole
-image logs in the
hydraulic-test zone. When these stress data are compared with transmissivity of each test
section, this deduction seems to be justified: In the set of most-transmissive zones,
induced stresses on fractures show a very high shear/normal stress ratio. Orientations of
discontinuities in these flow zones are consistent with those predicted by theory.
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