DAS System Modeling and Data Validation for CCS Monitoring

Summary Monitoring of CCS facilities with fiber optic has increased rapidly over the last six years. As part of carbon capture and storage monitoring fiber optic tools have been deployed at different test sites. This monitoring has taken advantage of enhancements in distributed acoustic sensing (DAS) technology. Here we present a workflow to assess optimal optical acquisition to acquire seismic signals, passive and active, that are needed for permanent reservoir surveillance. We present data from new DAS interrogators units capable of sensing long distances that would encompass CCS projects being developed on land and offshore. Data presented here includes active seismic within a shallow CCS facility connected to a long fiber optic line. In addition the long range technology is validated for passive induced seismicity surveillance. We demonstrate that the fiber optic DAS systems have high sensitivity needed for high resolution imaging of storage facilities and for detectability of potential induced events during permanent injection monitoring.