4D Seismic Effects Triggered by Thermal Stimulation – A Case Study Onshore NW Germany

Summary Within an overlap area of two different seismic surveys of 2005 and 2018, changes of reservoir reflectivity were observed. With the help of reservoir engineers these anamalous changes could be linked to thermal stimulation. Subsequently a dedicated 4D seismic processing confirmed the initial observations. The NRMS volume is now being used to map steam effects and to optimize the reservoir model with regards to gas saturation and transmissibility of faults. Additionally the results of the 4D analysis allow to come up with a permanent seismic reservoir monitoring system.