3D Geological Modelling at BRGMC. TruffertBGR-GeoEurope3D 5th June 2008

05/06/2008

3D Geological Modelling at BRGM

1. Main axis and application fields of 3D geological modelling in BRGM 2. Softwares and methods 3. Examples of applications 4. Projects in R&D

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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3D Geological Modelling at BRGM 1. Two main axis

> Applications Construction of 3D geological models (geometry + properties) Models are often the input for the simulation of a process (water or CO2 flow, seismic, )

> Research

Development of geological modelling softwares

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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3D Geological Modelling at BRGM 1. Application fields

> > > > > > >

Basic geology knowledge (regional / localscale)

Aquifer inventory; input model for flow simulation Urban geology Seismic risk Engineering projects(tunnel / mineral water )

Assessment of CO2 storage capacity Assessment of geothermal potential>4

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

3D Geological Modelling at BRGM

1. Main axis and application fields of 3D geological modelling in BRGM 2. Softwares and methods 3. Examples of applications 4. Projects in R&D

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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3D Geological Modelling at BRGM 2. Softwares & methods 4 Main tools used :> > > >Layer-cake geometry, many data

GDM + MULTILAYER

Complex geometry, true 3D objects, geophysical inversion

GEOMODELLER

Complex geometry and fault networkEARTH VISION (commercial software)

Petrophysical properties, facies, 3D simulationsISATIS (commercial geostatistical software)

home made Methodologies and softwaresGeoEurope3D : modelling at BRGM; BGR meeting, June 2008 >6

3D Geological Modelling at BRGM 2. Softwares & methodsGDM + MULTILAYER SOFTWARES

> > > >

Layer-cake geometry, faults considered as vertical 2D geostatistical interpolation

Top, bottom or thickness of a layer

Data: boreholes, full geological map, cross sections, 3D passage points

Several thousands of data points can be taken into account

Main advantagesFull set of data consistency checks (hole-DEM, hole-hole, hole-geological map, histogram, geostatistical cross validation) Stratigraphic pile 3D Constraint points digitized on 2D maps or cross sections (in GDM) Automatic contour maps (with scale, axis, ), logs But no direct 3D visualisation export of result grids to other softwares (Arcview, Mapinfo, EarthVision)

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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3D Geological Modelling at BRGM 2. Softwares & methods> > > >Complex 3D geometry; geophysical inversion 3D potential field interpolationA geological interface is a particular isovalue V0 of a 3D field V=f(X,Y,Z)

Data: boreholes, points from the geological map, digitized cross sections, 3D boundaries points + orientation data(Number of data limited to max 2000 to 3000 per geological unit)

Main advantages

Very Easy-to-use software Takes into account structural data Complex geology (folds, inverse faults, ) Geological pile 3D constraint points digitized on 2-D map or cross sections True 3D model (geological formation known at every 3D point) Full 3D visualisation (surface+volume) Geophysical inversion

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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3D Geological Modelling at BRGM 2. Softwares & methodsEARTH VISION SOFTWARE

> > > >

Complex 3D geometry and fault network Spline type interpolation for layer-cake geometry, or 3D function for 3D objects Data: 3D passage points from boreholes, geological map, digitized cross sections, seismic data Main advantages

complete software, automatic fault throw re-construction geological pile Constraint points digitized in 3D 3D visualisation (surface+volume) Time/Depth conversion But more difficult to use, does not handle inequalities, expensive More adapted for oil-industry data (many seismic, few holes)>9

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

3D Geological Modelling at BRGM 2. Softwares & methodsISATIS SOFTWARE

> Simple or complex 2D-3D geostatistics > 2D-3D Interpolation (geometry or rockproperties)

> 2D-3D Simulation (facies simulation, pixel-basedmethods or object-base methods)

> Main advantages Includes nearly all geostatistical functions 3D visualisation (surface+volume) But need of good geostatistical knowledge

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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3D Geological Modelling at BRGM

1. Main axis and application fields of 3D geological modelling in BRGM 2. Softwares and methods 3. Examples of applications 4. Projects in R&D

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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3D Geological Modelling at BRGM 3. Examples

> Basic geological knowledge

Paris Basin (MultiLayer)

Champtoceaux, Laragne (GEOMODELLER)

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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> Basic geological knowledge

Marine geology (GEOMODELLER) Pre-Pliocene Geological Map (Isochronic map of the Messinian erosion surface)

3D Geological Modelling at BRGM 3. Examples

Main objectives :

Describe the markers of the Messinian Salinity Crisis in the marginal basin

Understand relationships between theMessinian phase and the regional tectonic context

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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3D Geological Modelling at BRGM 3. Examples

> Aquifer inventory / input model for flow simulation

Infra-Toarcian aquifer Poitiers region MultiLayerGeoEurope3D : modelling at BRGM; BGR meeting, June 2008

Model of SAQ aquifers Saudi Arabia EarthVision> 14

3D Geological Modelling at BRGM 3. Examples

> Seismic risk Suva (Fiji, 2000) : Geometry (GDM) Nice (France, 2002) : Geometry (GEOMODELLER)

Nice model (alluviums) : model used to simulate the ground behaviour during a seismic eventGeoEurope3D : modelling at BRGM; BGR meeting, June 2008 > 15

3D Geological Modelling at BRGM 3. Examples

> Urban Geology Lyon (2000) : Geometry (GDM) + 3D flow simulation Bordeaux (2006) : Geometry (GDM+ISATIS); Geotechnical and hydrogeological properties (ISATIS)

3D probability map of being in a low permeability terrain in the alluviums of a sector of Bordeaux city Size of model: approx 7 km * 6 km * 15 mGeoEurope3D : modelling at BRGM; BGR meeting, June 2008 > 16

3D Geological Modelling at BRGM 3. Examples

> Engineering projects France-Italy Fast-Train Tunnel (2005): Geometry (GEOMODELLER, figs.) Mineral water (2007): Geometry (GEOMODELLER) + double phase flow simulation

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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3D Geological Modelling at BRGM 3. Examples

> Assessment of CO2 storage capacity Dogger in Paris Basin : geometry (EARTHVISION) Dogger in Paris Basin: facies and flow properties (ISATIS) CO2Net project

Permability model in cross stratified sanstone, used for CO2 flow simulation (Cmos software GEUS)

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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3D Geological Modelling at BRGM 3. Examples

> Geothermal Potential

Limagnes basin (2005) : Geometry (GEOMODELLER) volume calculation Paris Basin (2007) : 3D temperature field (ISATIS)

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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3D Geological Modelling at BRGM

1. Main axis and application fields of 3D geological modelling in BRGM 2. Softwares and methods 3. Examples of applications 4. Projects in R&D

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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3D Geological Modelling at BRGM 4. Projects in R&D

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Improving construction of models

More data in Geomodeller MultiLayer functions in Geomodeller software More realistic geological models Improve imports and exports Improve geophysical inversion Faster algorithms and automatic workflows

> >

Links with further processing

Develop appropriate meshers

Models + metadata available on the webPublic Geo-scientists,

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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3D Geological Modelling at BRGM 4. Projects in R&D

> Final objective: to give the geologist an integratedinterface on his PC, enabling :

search and display available data (drill holes, geol maps ) download + pre-process this data build a geometrical model mesh this model according to the final objective of the work populate the meshes of the model with the appropriate properties simulate a physico-chemical process in this model display results in 1D, 2D, 3D, 4D

> Web server for models and results

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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3D Geological Modelling at BRGM - Conclusion

> BRGM is involved in 3D geological modellingsince 10 years > 3D modelling is the key issue for geology and forward applications (ground-water, risk assessment, land-use, mineral resources and oil exploration ) > Continue Research & Developpement are needed to implement a workflow from data acquisition to 3D dynamic modelling > Different 3D modelling softwares are needed

GeoEurope3D : modelling at BRGM; BGR meeting, June 2008

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