Gas production on Groningen field (Netherland) is inducind seismic activity since 30 years, with significant magnitudes. NAM (Nederlandse Aardolie Maatschappij) as the operator of the gas field, decided to implement a seismic network, including two deep vertical arrays with sensors at 3000m depth in the reservoir section. Due to strong velocities contrasts, recorded seismic signals were very complex to analyse, with refracted and reflected waves combining with direct arrivals. Seismic events location remains then a major challenge. Thanks to waveform modelling, phase identification, and location quality control, a consistent database was achieved with 880 events located. The event locations are mainly aligned on the fault systems, and allowed a better understanding of fault reactivation behaviour. Determining event depths and improving the sensitivity were part also part of the original objectives.
Presentation Date: Tuesday, October 13, 2020
Session Start Time: 9:20 AM
Presentation Time: 10:35 AM
Location: Poster Station 4
Presentation Type: Poster