Back to overview
3.8 Geophysical Laboratory experiments
Main objective
This work package aims to improve the fundamental understanding of seismic monitoring.
Monitoring of storage in terms of saturation and pressure changes through integrated
P- and S-wave seismic characterisation: theory and lab verification
Time-lapse seismic P- and S-waves can in theory be inverted to pressure and saturation changes in a reservoir. Such an inversion is important to calibrate flow models leading to an improved tracking of the plume in the reservoir and to determine (local) pressure build-ups, which can form a potential hazard for the cap rock.
For a proper inversion additional constraints in the form of rock physics models are required. For CO2 storage this inversion has been difficult to prove in the field. In this task we propose to use the down-scaled multi-sensor seismic experiment facility at the TUD to carry out and improve the inversion under controlled circumstances. Focus will be on mimicking the geological storage sites selected. Additional experiences from other sites like Sleipner will be taken into account.
Monitoring of storage in terms of saturation and pressure changes through EM characterisation: theory and lab verification
Previous work of TUD has shown that, even under quasi-static flow conditions, capillary pressure in a water-CO2 saturated porous sand is a unique function of electric permittivity and water saturation. This enables us to determine the capillary pressure from measuring the electric response behaviour of the material. This also enables us to determine whether the CO2 concentration is stable in the porous material, increasing or decreasing.
In past experiments this was detectable at very small flow rates. We propose to perform new measurements on reservoir samples and under (comparable) in-situ conditions, at high pressures and temperatures to establish this unique relation also under in-situ conditions.
Workpackage managers
Members
Back to overview
