SEGJ Technical Conference

Field observation and numerical study of seismic ACROSS toward hydrocarbon reservoir monitoring

Abstract Reservoir monitoring plays an increasingly important role in reservoir management at giant oil fields. We consider a potential application of a permanent seismic source "ACROSS" (Accurately Controlled and Routinely Operated Signal System) that can continuously excite controlled seismic signals over years. We obtained stable low-frequency data (3.5-15Hz) at JOGMEC Kashiwazaki test field, Japan. Since we applied ACROSS with a horizontal rotation axis, the pronounced P-wave energy can be observed. Also, our 2D simulation study demonstrates that an application of full-waveform inversion makes it possible to delineate residual P-wave velocity associated with fluid replacement. The superior repeatability of ACROSS may bring a breakthrough towards hydrocarbon reservoir monitoring.