Abstract
As part of its strategy, the Geological Survey of Denmark and Greenland (GEUS) is to develop a national, digital 3D geological model of Denmark that can act as a publicly accessible database representing the current, overall interpretation of the subsurface geology. A national model should be under constant development, focusing on meeting the current demands from society. The constant improvements in computer capacity and software capabilities have led to a growing demand for advanced geological models and 3D maps that meet the current technical standards (Berg et al. 2011). As a consequence, the users expect solutions to still more complicated and sophisticated problems related to the subsurface. GEUS has a long tradition of making 2D maps of subsurface layer boundaries and near-surface geology (Fredericia & Gravesen 2014), but in the change from 2D to 3D and when combining data in new ways, new geological knowledge is gained and new challenges of both technical and organisational character will arise. The purpose of this paper is to present the strategy for the national 3D geological model of Denmark and the planned activities for the years ahead. The paper will also reflect on some of the challenges related to making and maintaining a nationwide 3D model. Initially, the model will only include the Danish onshore areas, with the Danish offshore areas and Greenland to be added later using a similar general setup.
Highlights
The national 3D geological model of Denmark will be constructed from the geological and geophysical data collected during decades of surveying
All basic data used in the national 3D geological model are stored in an array of GEUS databases
An established dialogue with potential users throughout the process will help target the model contents towards a versatile national model that meets the requirements of the public and at the same time secures the use of the huge amount of valuable data collected over several decades
Summary
GEUS hosts a wide range of publicly accessible databases (e.g. Ditlefsen et al 2012; Hansen & Pjetursson 2011; Møller et al 2009a, b; Tulstrup 2004). The most significant databases are the Jupiter well database, the geophysical database GERDA, the oil and gas database FRISBEE and the Geological Models Database These databases will constitute the main data supply for the national 3D geological model, and their continuous update is very important. The intensive groundwater mapping campaign over the past 15 years has produced a large number of publicly available models for the upper parts of the subsurface (Thomsen et al 2013). This has resulted in a patchwork of 2D and 3D models, but because the models have been built in different ways they are difficult to merge.
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