Focused seismic monitoring in the Greensand CCUS project

Paper presented at the 4th EAGE Global Energy Transition Conference & Exhibition, France, Paris, 14-17 November 2023

Written by: T. Roth¹, J.L. Mari², L. Ollivier², H. Al Khatib², A. Szabados³, J. Grobys³, N. Ahmad³ – 1 Wintershall DEA, 2 SpotLight, 3 INEOS E&P

Summary:

The Greensand project aims to convert the depleted oil fields in the Siri Canyon offshore Denmark into long-term CO2 storage sites. During the pilot CO2 injection project, a novel focused seismic monitoring method developed by SpotLight was tested. We conducted a seismic baseline acquisition prior the first CO2 injection as well as monitoring surveys during and after the pilot campaign. A special processing flow was developed to increase signal/noise ratio and comparability to vintage 3D seismic data for the newly acquired focused seismic data. We were able to detect the change in subsurface CO2 concentration when comparing baseline with monitoring surveys in correlation to synthetic modelling results. We have proven with the seismic monitoring of the Greensand pilot CO2 project that the tested method can therefore be used as a smart and lean monitoring tool for CO2 storage projects.

Download: abstract_GET2023