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1 -
Ten years of expertise in integrated earth model
construction and simulationSteen A. Petersen Gerrit ToxopeusSusanne Lund Jensen
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In close collaboration with:
Technical University Delft
Simula Research Laboratory Oslo
GEUS (Geological Survey of Denmark and Greenland)
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Integrated earth modelling
Integrated Earth Model
Realizationbuffer
VisualisationEditing
Surface data
Well dataGeological
data
Drilling performance
Production
Characteristics:
Multi-purpose
Multi-scale
Multiple-dimension
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Filling space by interfering distance fields
Common practise:
Property spanned between geometries
Our approach:
Property depends on distances to several geometries
Distances exist in any space of Dimension > 0
P(x) = F(p(di(x)))
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Distance fields (examples)
2&3D distance fields of parametric geometries (1&2 parameters) (Petersen, S.A., Hjelle, Ø., Jensen, S.L, 2008, EAGE Conf & Techn.Exh.)
Distance field reflects modulus/rheology
Concentric deformation
Similar deformation
Axial direction
Distance fields in action Alaei, B, Petersen, S.A., 2007, Petr. Geos. 13(3)
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Draping (left) vs onlappingoverburden (right)
Perturbation in geometry and geological style Oseberg East
Draping Onlapping
SyntheticSyntheticReal data
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Dissolution of anhydrites - Kharyaga
dissolution
anhydrite
anhydrite
Undulating surface used to define dissolved zones
Surface seismic section indicating position of remaining anhydrite
Model I:Thick anhydrite (50m)
Model II: Thin test suggests 20 m
Synthetic
Synthetic
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Dolomitisation of Carbonates-artificial structure
Dolomitisation appears to blur the seismic expression of fault.
Plume associated with fault. Lateral distribution depends on distance field and porosity.
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Real seismic Synt (-.5) Synt (0) Synt(+.5)
0 400 8000
0.2
0.4
0 400 8000
0.2
0.4
0 400 8000
0.2
0.4
??
One modelTwo realizations
AcousticImpedance
Combining induction log and surface seismicTilt perturbation
Resistivity
Apparent Resistivity
Reflection seismic
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Gas out of solution – Troll (4D)4D signal revealed an unexpected additional feature.
Normal 4D signalAbormal 4D signal
Impedance contrast between vintages
Diff. due to gasOWC
Reproduction of 4D signal
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ImplementationIntegrated earth modelling operates on Matlab (“Compound”)
Easily distributed and maintained internally
Invites colleagues to implement add-ons
Extra functionality via the net (“global support”)
Filling a gap in standard interpretation software
50 % technical services
Key instrument in (what if) RD feasibility studies
Trends
Moving downhole, production, EM, potential field
Complex geometries (ex. non-parametric surfaces)
11 - Classification: Internal 2010-05-03