A feasibility and efficiency study of seismic waveform inversion for time-lapse monitoring of onshore CO2 geological storage sites using reflection seismic acquisition geometries

摘要: Monitoring of the CO2 distribution at depth is imperative for onshore geological storage CO2. Seismic methods are effective monitoring tools during and after injection process, but generally expensive time consuming to perform. In this paper we perform a series synthetic experiments in order compare seismic waveform inversion method with conventional time-lapse sites. We mainly focus our study on data sets typical reflection acquisition geometries that far offset limited. Two (consisting one baseline repeat) were generated by third party 2D forward modeling code procedure. The velocity models based simplified structure Heletz site Israel. area into which injected few hundred meters wide 10 s high. results determine how sparse spatial sampling affects increasing both shot receiver spacing. test set different strategies. First, invert each independently using phase amplitude information. Then them only also influence starting model. Finally, double difference equivalent inverting between repeat sets. During relative coarse model higher frequency used better represent real data. Our show that, under certain noise conditions, it may be possible use combination monitor changes caused injection. conclude good complement standard CDP processing when