Bandpass filtering, tilt derivative and horizontal gradient maps of the gravity and magnetic data were also generated using MAGMAP.
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First they conducted a qualitative and quantitative analysis on the free air gravity anomaly and vertical gravity gradient data, TNO Bouguer gravity anomaly and EMAG2 total magnetic intensity data followed by filtering and processing using the Butterworth bandpass filtering feature of MAGMAP, part of Geosoft’s Geophysical Interpretation extension for Oasis montaj, MAGMAP was also used to reduce the EMAG2 total magnetic intensity to pole in order to place the anomalies on top of their causative bodies at depth, since the earth’s magnetic field is not perpendicular to the surface at this latitude. “The off-take potential for heat from deep geothermal and ultra-deep geothermal is substantial,” he says, “with large cities like Eindhoven with its university campus and technology firms, and ‘s-Hertogenbosch for example.”ĭata interpretation was undertaken in several steps. Van Heiningen says the Roer Valley Graben was chosen, “given the interest it receives from industry and government for its geothermal potential and assumed widespread distribution in the Roer Valley Graben, and moreover the depth range in which it is supposed to reside.” They targeted the Dinantian Limestone Formation there to characterize its distribution, structures, and depth. Similarly, resolution of gravity and magnetic data decreases with depth proportionately although major structures, basement geometry, position and general geometries of intrusions, and basin boundaries can be distinguished for depths beyond 3 km. “In addition, the seismic data was migrated with out-of-date processing workflows and parameter settings, eliminating important details from the data that we can improve on significantly if unmigrated seismic data is at hand,” says Van Heiningen. Existing seismic data onshore the Netherlands are mainly 2D, most pre-date 2000, and have limited resolution beyond 3 km depth. The project team faced several challenges. As a result, the approach entails 2D gravity and magnetic modelling constrained by seismic interpretation of the post-Permian section, which in turn has been tied to reprocessed velocity and density well log data, and additional information on Moho and intra-crustal discontinuity depth from recent studies. In a paper presented at the 80th EAGE Conference & Exhibition 2018 in Copenhagen, Van Heiningen explains that these formations are out of the reach of existing seismic and well data.
They exploited several geophysical and geological datasets in one modelling environment to demonstrate that several kilometers of sediments have been deposited and preserved below the Upper Triassic in the Roer Valley Graben. Initial targets are the Carboniferous and Permian formations which host proven oil and gas reservoirs.Ī recent project conducted by Pieter Van Heiningen of Provenance Exploration Consultancy BV and his business partners Vincent van Hoegaerden (EnerGeophy Consultancy), Dr Tijmen Jan Moser (Moser Geophysical Services) and Dr Nuretdin Kaymakci (Provenance Exploration Consultancy BV) used an integrated approach.
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Dutch consumers currently depend heavily on natural gas from the country’s Groningen fields, which will be shut down within a decade.īut before funding new exploration for ultra-deep (>4 km) geothermal reservoirs, full exploitation of existing subsurface data is being encouraged. Making the transition from fossil fuels to renewable energy, the Netherlands is promoting development of geothermal sources.