Digital Geological Model: DGM-deep

Since 1985 the Geological Survey of the Netherlands is commissioned to compile a consistent, regional-scale petroleum geological framework for the deep subsurface of the Netherlands, both on- and offshore. The general approach and workflow of the deep mapping program correspond to that of the hydrocarbon E&P industry.
Firstly the onshore mapping was executed and published on paper (Geological Atlas of the Subsurface of the Netherlands-onshore, TNO-NITG, 2004) and the offshore domain was covered between 2004 and 2010  (Kombrink et al., 2012). Since 2010 the onshore area is in the process of revision with an upgraded fully digital workflow and using new available public data. It is targeted at new resources and functions of the subsurface, such as unconventional hydrocarbon resources, geothermal energy potential and storage of natural gas, oil, CO2, water and nuclear waste. The increasing demand for deep subsurface space with specific rock properties and utilization potential, presents potential subsurface planning conflicts. Such issues are, amongst others, dealt with in a new policy for underground spatial planning (STRONG – Structuurvisie Ondergrond), which is currently being prepared by the Dutch government (publication in autumn 2015). This policy paper will be the guideline for a sustainable and responsible use of the subsurface of the Netherlands. Our subsurface data and models serve as input to this initiative.

Data

The DINO database contains over 135 3D seismic surveys covering around 99.900 km2 and more than 577.000 km 2D seismic lines (analogous- & digital lines). The number of non-confidential wells is around 5800. All non-confidential 3D-surveys and 1305 wells have been used to stratigraphically constrain the modelling process. 2D Seismic data has been used to fill in areas not covered by 3D seismic surveys  (Fig.1-seismic coverage, Fig.2-wells used).
The locations of the boreholes used for DGM Deep are shown on the interactive map. However it is not yet possible to order these data at DINOloket. The seismic data used for DGM Deep is not visualized on the interactive map. If you want to order either the borehole data or the seismic data, please visit NLOG.nl.

Use and uncertainties

DGM-deep aims at providing a regional geological understanding of the build-up of the deep subsurface of the Netherlands. This implies that the model should not be consulted for reservoir scale issues and -evaluation. To assess the usability and reliability of the DGM-deep model, uncertainties have been addressed in the modelling workflow. An explanatory note is provided describing the uncertainty procedure applied. 

Actual and previous releases

The Digital Geological Model-deep (DGM-deep) is a regional subsurface layer model covering the on- and offshore of the Netherlands. Twelve geological horizons, ranging from Carboniferous to Neogene in age, are the constituents of this stacked grid model. The model is based on interpretations of publicly available 2D and 3D seismic survey data, combined with a variety of well data, supported by biostratigraphical, petrophysical and chemical analysis. The interpreted seismic horizons are the bases of lithostratigraphic units which are defined in the Stratigraphic nomenclature of the Netherlands
Previous versions of the DGM-deep models and their related data can be retrieved through the Dutch Oil and Gas Portal (see details on versions in table below). The current released DGM-deep v4.0 is a model of the Netherlands onshore extended to the 3 mile zone. For the first time the model can also be examined in a viewer via DINOloket. In future DGM-deep releases the onshore and offshore areas will be combined and deliverables will also contain 3D modelled fault planes.

Table 1: Actual and previous versions of DGM-deep