1 -

Ten years of expertise in integrated earth model

construction and simulationSteen A. Petersen Gerrit ToxopeusSusanne Lund Jensen

1 -

In close collaboration with:

Technical University Delft

Simula Research Laboratory Oslo

GEUS (Geological Survey of Denmark and Greenland)

2 -

Integrated earth modelling

Integrated Earth Model

Realizationbuffer

VisualisationEditing

Surface data

Well dataGeological

data

Drilling performance

Production

Characteristics:

Multi-purpose

Multi-scale

Multiple-dimension

3 -

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)))

4 -

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)

5 -

Draping (left) vs onlappingoverburden (right)

Perturbation in geometry and geological style Oseberg East

Draping Onlapping

SyntheticSyntheticReal data

6 -

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

7 -

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.

8 -

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

9 -

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

10 -

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