Introduce a reliable passive acoustic monitoring (PAM) system to avoid a potential impact of seismic sources on marine mammals.
Marine mammal mitigation and monitoring guidelines are widely adopted by regulators and oil companies and are implemented by geophysical companies during marine seismic surveys.A growing number of these stakeholders are requiring or encouraging the use of PAM for real-time detection and localization of marine mammals, especially during low visibility conditions and at night.The potential value of PAM as a real-time mitigation tool has been widely recognized. However, conventional towed PAM cable systems suffer from performance limitations affecting the detection capability (especially for baleen whales and animal localization accuracy. Seismic operators are also concerned by entanglement incidents with seismic equipment at sea that increase the operator’s safety exposure and potentially cause downtime.
The QuietSea™ system, launched by Sercel in 2014, aims to overcome these limitations.QuietSea™ is fully integrated in Sercel Sentinel® streamers, deploying an unprecedented number of sensors: 10 high-frequency and 48 low-frequency sensors for a typical 3D survey. Compared with the usual single low-frequency and three high-frequency sensors mounted in conventional towed PAM arrays, this system offers a step change in detection accuracy. Interfaced with onboard seismic vessel navigation systems, the automated detection and localization algorithms help to deliver truly objective, consistent, and reliable information for prompt decision-making.
INTERFACED WITH ONBOARD SEISMIC VESSEL NAVIGATION SYSTEMS, THE AUTOMATED DETECTION AND LOCALIZATION ALGORITHMS HELP TO DELIVER TRULY OBJECTIVE, CONSISTENT, AND RELIABLE INFORMATION FOR PROMPT DECISION-MAKING.
The low noise performance of Sentinel® streamers used in a large 3D array enables the detection down to 10Hz, which is unprecedented. The low-frequency vocalizations emitted by baleen whales, and especially by blue whales, often below human hearing thresholds, can now be much better monitored. Moreover, multiple sensors provide good detection and localization regardless of the listening direction.
QuietSea™ has been deployed on 3D seismic vessels during commercial seismic surveys and has proved its ability to overcome limitations of conventional systems by detecting baleen whales and providing precise localization.
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