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A 3D geological model of the Dutch Central Graben

Fokko van Hulten (EBN) Jo van Buggenum (Winz)

Acknowledgment: Fugro Robertson Wintershall Noordzee B.V. Energie Beheer Nederland B.V Total E & P Nederland B.V.

EBN/TNO rifting workshop, June 5 Utrecht

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A 3D geological model of the Dutch Central Graben

Outline

· · · · · · Introduction Building the Model Dutch Central Graben mega structure Some remarks on erosion Some remarks on salt structuration Conclusions

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Introduction

· Trilete rift system North Sea · Central Graben south branch · Dutch Central Graben

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Dutch Central Graben

2 D models

Heybroek., 1975

Wong et al., 1989 Schroot, 1991

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Clark-Lowes et al., 1987

EBN/TNO rifting workshop, June 5 Utrecht

Structural elements

Highs · CH=Cleaver Bank High · SGH=Schillgrund High · MNH =Mid North Sea High Basins · CG= Central Graben · North part · High part · Southern part · SG=Step Graben · TB=Terschelling basin · VB=Vlieland Basin · COS=Central offshore Saddle

EBN/TNO rifting workshop, June 5 Utrecht

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Stratigraphy

Tertiary

Dutch Central Graben

Major rifting Mesozoic Minor rifting

Paleozoic

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A 3D geological model of the Dutch Central Graben

Dutch Central Graben - Joint Industry Project

· Predict timing/maturity of known and potential source rocks

· Modeling their burial and thermal history · PetroMod TM 3D Model

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A 3D geological model of the Dutch Central Graben

Building the Model

Stratigraphic markers Database

Coordinates

3D horizons

Petrel Model

a

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A 3D geological model of the Dutch Central Graben

Building the Model

W E

Tertiary

Mesozoic

Paleozoic

W E

Framework 3D model: 10 seismic horizons (2D/3D) 24 layers (well data, isopachs) 25.000 km2 (area) 1*1 km grid size

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A 3D geological model of the Dutch Central Graben

Building the Model Merging

- Artifacts - Some outside areas have no data · Extrapolation · Well data · Literature

25.000 km2 (area) 1*1 km grid size

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Building the Model Merging 3D seismic

Base Tertiary

EBN/TNO rifting workshop, June 5 Utrecht

Base Cretaceous

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A 3D geological model of the Dutch Central Graben

Mega structure

MNH CG SG

Highs · CH=Cleaver Bank High · SGH=Schillgrund High · MNH =Mid North Sea High Basins · CG= Central Graben · North part · High part · Southern part · SG=Step Graben · TB=Terschelling basin · VB=Vlieland Basin · COS=Central offshore Saddle

EBN/TNO rifting workshop, June 5 Utrecht

CG CH CG SGH

TB

COS VB

FP

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A 3D geological model of the Dutch Central Graben

Mega structure

Isopach Upper Triassic

Triassic Rifting · N-S trend

Into the Terschelling basin

· Part salt withdrawal

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·Mega structure

Lineaments Terschelling basin Inversion hides the basin fill trends

Schieland Lower Cretaceous

Scruff

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A 3D geological model of the Dutch Central Graben

Mega structure - Inversion

EBN/TNO rifting workshop, June 5 Utrecht

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A 3D geological model of the Dutch Central Graben

Mega structure Cretaceous and Tertiary isopachs

Upper Cretaceous

Lower North Sea

Mid North Sea

Upper North Sea

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EBN/TNO rifting workshop, June 5 Utrecht

A 3D geological model of the Dutch Central Graben

Mega structure Cretaceous and Tertiary isopachs

Upper Cretaceous

Lower North Sea

Mid North Sea

Upper North Sea

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EBN/TNO rifting workshop, June 5 Utrecht

A 3D geological model of the Dutch Central Graben

Erosion Challenges

Identification of missing section Well data Seismic (structural) interpretation Regional trends No assistance form Vr profiles (present day overprint) Impact of salt-doming and salt-withdrawal on missing section

EBN/TNO rifting workshop, June 5 Utrecht

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A 3D geological model of the Dutch Central Graben

Salt challenges

· Salt

hard to model · Salt affects isopachs overburden

F M

G

EBN/TNO rifting workshop, June 5 Utrecht

Base Triassic

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A 3D geological model of the Dutch Central Graben

Salt Challenges

Salt active in different periods

Base Cretaceous

EBN/TNO rifting workshop, June 5 Utrecht

Base Tertiary

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A 3D geological model of the Dutch Central Graben

Conclusions

· 3D model

· · · · · Good visualization Easy to adjust Easy to export Limitations with salt in the model Erosion can be estimated better with model

EBN/TNO rifting workshop, June 5 Utrecht

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A 3D geological model of the Dutch Central Graben

Conclusions

· Structural model Dutch Central Graben

· Terschelling Basin area different compared to Step Graben Area in the North · Central Graben subdivision in Northern-, Mid- and Southern-area · Inversion direction N-S · Salt domes indicate late movements southern area

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E-W sections ­ Dutch Central Graben

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5.956.000

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5.987.000

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6.000.000

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6.020.000

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6.040.000

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6.070.000

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N-S sections 1

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N-S sections 2

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N-S sections 3

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