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Transcript of 1 Preliminary implementation / results, Task 7A1 Andrew Frampton Vladimir Cvetkovic KTH, Sweden...
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Preliminary implementation / results, Task 7A1
Andrew Frampton
Vladimir Cvetkovic
KTH, Sweden
David Holton
Serco Assurance, UK
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Task 7: Long-term pumping tests at Olkiluoto island, Finland
• Main objectiveUnderstand significance/usefulness of PFL measurements
• FeaturesExtensive site-characterisation data prior to the excavation of the ONKALO facility
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Strategy — overview
Model Construction
ConceptualFramework
Boundary Conditions
Top surface
Side boundaries
Bottom boundary
Borehole abstraction
Disturbances
‘Deterministic’ structures
Geometry
Properties
Conditioning
‘Background’ structures
Assessment of uncertainty
Calibration and results
DFN model EPM model
Questions
Tools
Forward modelling
Geostatistics (inverse)
Answers
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Model setup: Features
• Lateral boundariesTrimming (x,y) coords of domain to hydraulic conductors in contact with the Baltic Sea with head = 0
• Top boundaryApplying head = surface elevation
• Fracture zone geometryUsing smallFaces.txt files (”3Dfaces”) so in principle an exact copy of given data
• Using HZ20B_ALT and not HZ20B • Fracture zone transmissivity
Constant (geometric mean) transmissivity
• Additionally: Near-surface DFNProperties such that effective hydraulic conductivity = 1e-8 m/s Sides:
head = 0
Top:head = elevation
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Model setup: Features
• Lateral boundariesTrimming (x,y) coords of domain to hydraulic conductors in contact with the Baltic Sea with head = 0
• Top boundaryApplying head = surface elevation
• Fracture zone geometryUsing smallFaces.txt files (”3Dfaces”) so in principle an exact copy of given data
• Using HZ20B_ALT and not HZ20B • Fracture zone transmissivity
Constant (geometric mean) transmissivity
• Additionally: Near-surface DFNProperties such that effective hydraulic conductivity = 1e-8 m/s
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Model setup: Features
• Lateral boundariesTrimming (x,y) coords of domain to hydraulic conductors in contact with the Baltic Sea with head = 0
• Top boundaryApplying head = surface elevation
• Fracture zone geometryUsing smallFaces.txt files (”3Dfaces”) so in principle an exact copy of given data
• Using HZ20B_ALT and not HZ20B • Fracture zone transmissivity
Constant (geometric mean) transmissivity
• Additionally: Near-surface DFNProperties such that effective hydraulic conductivity = 1e-8 m/s
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Model setup: Features
• Lateral boundariesTrimming (x,y) coords of domain to hydraulic conductors in contact with the Baltic Sea with head = 0
• Top boundaryApplying head = surface elevation
• Fracture zone geometryUsing smallFaces.txt files (”3Dfaces”) so in principle an exact copy of given data
• Using HZ20B_ALT and not HZ20B • Fracture zone transmissivity
Constant (geometric mean) transmissivity
• Additionally: Near-surface DFNProperties such that effective hydraulic conductivity = 1e-8 m/s
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Model setup: Boreholes
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Here is KR24 !
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Model setup: Boreholes
• 1-D features• We use a well model to relate the
borehole residual pressure to the finite-element residual pressure
• depends on fracture transmissivity and on ‘skin’
Q
PP PEw
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Preliminary simulation results
• Simulation SS02a• Natural conditions (ie no pumping)• All required boreholes are included (as conductive features)
• Simulation SS04a• Pumping KR24:
Flux top part Q1 = 12 l/minFlux bottom part Q2 = 5.5 l/min
• All required boreholes are included (as conductive features)
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Heads in open BHsSS02a
0
1
2
3
4
5
6
7
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KR04 KR07 KR08 KR10 KR14 KR22 KR27 KR28
Borehole
He
ad
(m
)
Data
Sim
SS04a
0
1
2
3
4
5
6
7
8
KR04 KR07 KR08 KR10 KR14 KR22 KR27 KR28
Borehole
He
ad
(m
)
Data
Sim
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Heads in packed-off BHsSS02a
0123456789
Borehole
He
ad
(m
)
Data
Sim
SS04a
0
1
2
3
4
5
6
7
8
Borehole
He
ad
(m
)
Data
Sim
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KR04: Flow magnitude along BH depth
SS02a (natural) SS04a (pumping)
Simulation:Flow up/down BH
Simulation:Flow to/from fracture
Data:Flow up/down BH (?)
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KR14: Flow magnitude along BH depth
SS02a (natural) SS04a (pumping)
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KR22: Flow magnitude along BH depth
SS02a (natural) SS04a (pumping)
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KR27: Flow magnitude along BH depth
SS02a (natural) SS04a (pumping)
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KR28: Flow magnitude along BH depth
SS02a (natural) SS04a (pumping)
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SummaryHave shown • First implementation of model• Preliminary results for SS02a
(natural flow conditions with all boreholes as conductive features)
• Preliminary results for SS04a (pumping KR24 with all boreholes as conductive features)
Improvements / todo list:• Representation of near surface and BC• Representation of zones (variability)• Background DFN to represent details of
flows• Representation of pumping test
(in particular the details of the test)• Refinement of fractures near intersections• Conditioning of fracture T’s at intersections• Transport simulations• Transient simulations
Model Construction
ConceptualFramework
Properties
Conditioning
DFN model
EPM model
Boundary Conditions
Backgroundstructures
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end