Articulo Natalia 2
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Transcript of Articulo Natalia 2
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A surface NMR study for groundwaterresource assessment in the Uley
Basin, South AustraliaAaron Davis, Tim Munday, Jacqueline Frizenschaf and Nara Somaratne
CESRE/ WATER FOR A HEALTHY COUNTRY
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Purpose of study
Use hydrogeophysics to refine the model for Uley South Lens
Better define aquifer thickness, geometry and hydraulicproperties in areas where little information exists.
Determine the depth to groundwater, aquifer porosity anhydraulic conductivity
Determine whether aquifer bounds could be revised in GW
model
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
Trial non-invasive approachto examine as a pre-cursor todrilling
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Approach
Employ surface Nuclear Magnetic Resonance (sNMR) andTime Domain Electromagnetic (TDEM) soundings in the SWcorner of Uley South Lens
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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Why use NMR?
The only geophysical technique that allows for direct detectionof water in the subsurface
Non-invasive
Minimal environmental footprint
Less expensive than exploratory drilling
Estimate
Water content
Aquifer porosity
Hydraulic conductivity
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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Eyre Peninsula and Uley South
Only few aquifers
provide potablewater to EyrePeninsula
Uley South is
most importantone
Supports PortLincoln and eastcoast of the Eyre
2007-2008 waterallocation was~7200 Ml
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
100 km
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Uley South groundwater lenses
Port
Lincoln
Coffin Bay
Coffin Bay
National Park
Uley South
Coffin Bay A
Uley East
Uley Wanilla
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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Eyre Peninsula and Uley South Quaternary limestone
aquifers in the very
near surface
Rainfall dependent forrecharge (~500 mm/a)
Water levels had beendropping frombeginning ofproduction until 2008
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
Begin of extraction
Reduction of pumping
6028-00754
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Uley South lens recharge
Recharge is generally through sinkholes directlyinto the Quaternary Bridgewater formation
Water age can be as little as 60 days
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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Conceptual hydrogeological model
Source: EPNRM
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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Previous work: TEMPEST AEM Fitzpatrick et al, 2009
Tempest AEM survey Basin and aquifer geometry
Possible connection betweenCoffin Bay A and Uley South
Thickness and extent of UleySouth and Coffin Bay Afreshwater lenses
Confirmed seawater
intrusion to extent of ~700 min Uley South
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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Theres water in the hills: Elevation
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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Magnetics - basement geometry
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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Basement highs
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A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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Interval Conductivity -23 mAHD
Basement highs
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Planning of soundings
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
Inferred directions ofgroundwater flow
(Quaternary Limestone)
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Planning of soundings
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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sNMR & TEM Soundings
Vista-Clara GMR
Single-turn 72.5 m loop
Aligned with magnetic North (-67.4 inclination, ~59000 nT)
~2530 Hz
Depth of penetration/resolution ~60 m
NanoTEM
Operating at 32Hz
40 m loop
Depth of penetration ~80 m
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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sNMR: Site 3
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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sNMR: Site 3 Sounding data
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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sNMR: Site 3 Inversion
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
ULE098 is 460 m away from Site 3
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sNMR: Site 6
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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sNMR: Site 6 Inversion
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
ULE208 is 240 m away from Site 6
No
cutting
returns
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sNMR: Site ULE193
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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sNMR: Site ULE193 Inversion
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
~450 m/day
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sNMR: Comparisons
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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sNMR Sections (with AEM)
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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sNMR Sections (with AEM)
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
N S
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sNMR Sections (with AEM)
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
N S
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ConclusionDetected water in:
Quaternary aquifer (Bridgewater Formation)
FREE WILLY, porosity ~20%, HIGH k VALUES?
Partially constrained by Uley Formation
Tertiary aquifer (Wanilla Formation)
Mainly mobile, partly bound, porosity ~20% More saline than Bridgewater
AEM and sNMR assist in hydrogeological interpretation
Produce a section that shows extent of formations
Refined conceptual understanding of aquifer system and variation inaquifer characteristics, which provide opportunity to update GWmodels and management options.
A surface NMR study for groundwater resource assessment in the Uley Basin, South Australia
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Future planning of soundings
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Thank youEM ApplicationsDr Aaron Davis
Senior Research Geophysicist
t +61 8 6436 8951
e [email protected] www.csiro.au
WATER FOR A HEALTHY COUNTRY