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| | Abstract | | In CO2 geological storage, the monitoring of injected CO2 in the reservoir is crucial for predicting risk of CO2 leakage from reservoirs, increasing efficiency of CO2 storage and reducing the cost, and reducing the risk of fluid injection-induced seismicity. Time-lapse seismic surveys have been successfully applied for monitoring reservoirs. In conventional time-lapse seismic monitoring, however, the interval between monitoring surveys is usually long because of the high cost for each survey. This makes it difficult to identify unexpected changes in reservoirs (e.g., leakage). To address these issues, we have developed permanent monitoring source system. We further used distributed acoustic sensing (DAS) for the buried single mode fiber cable to record the monitoring signal in high spatial resolution. Presently we acquire the monitoring data in the geothermal field and offshore geological formation. This monitoring system can be further used in oil/gas exploration, and geothermal exploration, and disaster prevention (e.g., identification of dynamic behaviors of an earthquake fault, volcano, and landslide). |
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