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SUMMARY:Evaluating sensitivity and uniqueness of underdamped slug test mod
els for fractured rocks
DTSTART;VALUE=DATE-TIME:20190924T131500Z
DTEND;VALUE=DATE-TIME:20190924T133000Z
DTSTAMP;VALUE=DATE-TIME:20200704T095103Z
UID:indico-contribution-565@iah2019.adabyron.uma.es
DESCRIPTION:Speakers: AmÃ©lie Dausse (G360 Institute for Groundwater Resea
rch\, University of Guelph\, Ontario N1G 2W1\, Canada.)\nSlug tests are on
e of the most common field methods for estimating local hydraulic properti
es\, for fast and low-cost characterization of aquifer heterogeneity. In h
ighly permeable fracture zones\, underdamped responses\, identified by osc
illations of the water level\, are generally observed. Several analytical
and numerical solutions have been developed for modeling underdamped slug
test responses. However\, difficulties of interpreting data in fractured r
ocks from such tests are generally encountered because the complexity of t
he system raises the question of the choice of the appropriate model. In o
rder to gain more insights about the fundamental problem of uniqueness ari
sing with slug test analyses in heterogeneous media\, sensitivity and uniq
ueness analysis of three transient-flow models of underdamped slug tests i
s proposed. As different flow geometries may be encountered in fractured r
ocks\, we propose to evaluate solutions for linear\, radial and spherical
flows including inertial and wellbore skin effects in a fully penetrating
well. As expected\, the results from sensitivity analysis show that the hy
draulic conductivity parameter is the most sensitive parameter regardless
of model configurations. However\, the sensitivity to aquifer storage is i
mportant for the linear flow case\, less important for the radial case and
negligible for the spherical case. The wellbore skin is also not negligib
le and must be considered. The uniqueness analyses show that underdamped r
esponses are challenging to interpret as different flow geometry may fit t
he data\, which results in different estimation of the permeability.\n\nht
tps://iah2019.adabyron.uma.es/event/1/contributions/565/
LOCATION: Auditorium 2
URL:https://iah2019.adabyron.uma.es/event/1/contributions/565/
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