In the North Sea, about 20 kilometres from the coast near Hoek van Holland, the University of Twente (UT) will soon start an experimental study into an innovative form of seismic monitoring. The University of Twente and the CO2 transport and storage project Porthos work together in this research. A few maritime seismometers will be placed within the 500-metre zone of Porthos' P18-A platform, continuously measuring vibrations in the subsurface. This technique should better understand underground processes and provide valuable insights for safe and responsible CO₂ storage.
This project is part of the DICTUM research, which focuses on improving the imaging of deep subsurface structures in the Netherlands. Where seismic data is traditionally collected with land-based networks, DICTUM uses sensors directly on the seabed. The short distance to the Porthos CO2 injection point makes it possible to better perceive subtle signals, which contributes to the early detection of any changes in the subsurface, so that they can be acted upon.
The UT plays a central role within the project and develops techniques to make existing seismic measurement principles suitable for offshore applications. This approach is innovative in the Netherlands and contributes to the development of internationally leading knowledge in the field of subsurface modelling and geomechanics.
New in the Netherlands
UT developed an innovative seismometer system concept that monitors real-time local seismic activity in the North Sea. Such a system did not yet exist because the shallow and busy North Sea is too dynamic for current seismological sensor technology. The development of the system has been coordinated by Dr. Islam Fadel within the DICTUM project. "This collaboration with Porthos is a unique opportunity to test the new concept, further develop the system, better monitor the area and increase our knowledge of the geology under the North Sea."
Field test with dummy seismometers
A field test with dummy seismometers at the end of 2024 provided valuable technical insights, such as the effectiveness of the anchor system. These results have been incorporated into the experimental phase, which has started and will run until 2026. If this is successful, the intention is that the maritime seismometers will be an official part of the national KNMI seismological measurement network from 2027.
Valuable information
Monitoring and research make an important contribution to the safe storage and transport of CO₂. At every stage of the Porthos project, data is collected that provides valuable insights – not only for Porthos itself, but also for future offshore projects within the energy transition. Although offshore monitoring is not a legal obligation under the existing storage permit, Porthos is therefore happy to contribute to this type of research initiative.
EBN, one of the three parent companies of Porthos, has taken the initiative to join the DICTUM study. This organisation is not only closely involved with Porthos but also plays an active role in future projects.
About the DICTUM project
The DICTUM project is a research initiative within NWO's DeepNL programme, aimed at improving the understanding of the deep subsurface of the Netherlands using multi-geo-observables. The project is a collaboration between several Dutch universities and research institutions, in which the University of Twente plays a central role.
About Porthos
Porthos is a partnership between EBN, Gasunie and the Port of Rotterdam Authority. The project focuses on the safe transport and storage of CO₂ in depleted gas fields under the North Sea. Porthos is recognised as a Project of Common Interest (PCI) by the European Union and received a grant of 102 million euros from the Connecting Europe Facility. More information: www.porthosCO2.nl
