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Home > Science and research > Structure, Composition and Evolution of the Earth's Crust > 3D geological modelling

3D geological modelling

Within its research activities as well as different commercial contracts, the Czech Geological Survey deals with creation of the 3D geological models and with the definition of a unified systematic approach to their storage, administration and presentation.

As the administrator of large geoscientific datasets from the whole territory of the Czech Republic, the Czech Geological Survey is involved in numerous applied research projects dealing with various kinds of use of the underground rock environment. The recently solved issues of utmost national importance include high-speed railway tunnels, reassessment of mineral resources, assessment of geothermal energy potential, and, last but not least, location of a deep radioactive waste repository.

Interactive map below shows areas in the Czech Republic that have already been modelled in 3D - by clicking on an area of interest, the user can see basic metadata about the model and its preview (or a preview of a part of the model that is not restricted for public presentation). The overview map is being continuously updated.

Currently, SW MOVE is used for the creation of the structural geological models and SW Petrel for the modelling of the sedimentary basins. The models are visualised on the web by means of a CGS-made viewer based on the ESRI API for Javascript.
A new metadata profile 3DGM has been defined to ensure a unified metadata description of the models produced by CGS. The Profile is fully compatible with the INSPIRE requirements and with the international standard ISO 19115.

The scarcity, heterogeneity and complexity of available archived and newly acquired geological data often do not allow for any semi-automatic techniques of model construction; the models usually need to be created purely manually. The 3D geological models (see example below) created in the Czech Geological Survey cover a broad spectrum of scales and lithotectonic environments. Concerning scale, they range from meters in the case of outcrop fracturing quantification for Discrete Fracture Network models, to regional scale covering areas of hundreds square kilometres and up to 1.5 km depth. They depict structurally complex high–grade metamorphic units that exhibit several episodes of pervasive ductile deformation, partial melting and emplacement of magmatic bodies, as well as simple overlying sedimentary formations. An integral part of the model production is also an initial assessment of model credibility, used especially for purposes of safety analysis.

Based on the 3D geological models, 3D hydraulic and transport numerical simulations are performed to estimate groundwater flow. Additionally, the models are used by engineering companies in CAD-type SW as natural limits for technical design of the underground facilities.

3D geological model for deep radioactive waste repository

3D geological model describing geometry of lithologies at one of the potential HLW repository sites. Extent of the model is 12.3 x 8.3 x 1.5 km. Surface of the granitic pluton of interest (in pink colour) is removed to show its interior down to 1.5 km depth. Yellowish polygons define potentially suitable locations for the repository at ca. 500 m depth. Fault planes are not shown.

Search for unconventional and conventional energy resources and for methods, which would reduce the greenhouse gas emissions benefits from new 3D insights into sedimentary basin geology. Working with large geophysical and geological datasets is now easier and faster with software such as Petrel. 3D models visualize the architecture of sedimentary strata, sequence stratigraphic details and faults. We use them for evaluation of geological structures focused on reservoir volumes, permeability, and seal efficiency. The results serve as basis for further scenario testing of future technological actions and related environmental risks.

3D geological model of LBr-1 structure

3D geological model of LBr-1 structure in the Vienna basin with faults, 4 reservoirs and a seal horizon built based on well and seismic data using Petrel software. The data was provided by MND and the Petrel software academic license by Schlumberger. (Author: J. Franců et al.)

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Czech Geological Survey
Klárov 131/3
118 21 Praha 1
phone: +420257089447
fax: +420 257 531 376
jan.franek@geologycz
Czech Geological Survey
Klárov 131/3
118 21 Praha 1
phone: +420257089434
fax: +420 257 531 376
lucie.kondrova@geologycz