High-fidelity seismic images for reliable mapping of complex reservoir features
The Qmarine point-receiver marine seismic system was launched in 2000 and introduced a number of new concepts to the towed-streamer market. The system set the benchmark for other acquisition technologies and continues to perform at the highest levels today. Based on an integrated system composed of the recording (TriAcq), positioning (TriNav) and source (TriSor) subsystems, it features a unique solid gel filled, zero-spill, point-receiver streamer. Unlike other systems all in-sea components such as acoustic positioning and streamer control devices (Q-Fins) are integral to the streamer which reduces noise and drag. Since its introduction, the system has successfully delivered across a wide range of basins and environments around the world. At all stages across the E&P cycle, the Qmarine system achieves value through high resolution and repeatability within the required time frames.
A major source of noise that affects marine seismic data quality and repeatability is related to the movement of the streamer through the water. This is accentuated by adverse weather and sea conditions. The Qmarine system uses single-sensor recording to characterize noise with sufficient spatial fidelity, eliminating it using targeted digital filtering techniques. Unlike conventional noise suppression, this does not affect the signal bandwidth or fidelity.
The Qmarine system pioneered steerable streamers by introducing the Q-Fin marine seismic streamer steering system. The Q-Fin system's remote-controlled wings reduce noise and enable both precise depth control and horizontal steering. Horizontal streamer steering provides feather correction, safe streamer separation control, fan-mode shooting, active steering for optimal coverage, and 4D repeatability.
Calibrated sources and positioning
The signature of any seismic source varies from shot to shot for a multitude of reasons, including source dropouts and variations in array geometry. This variation reduces the accuracy and repeatability of seismic data. The Qmarine system has an advanced digital source controller that enables calibrated marine source—a fully calibrated source signature derived for every shot utilizing the notional source method.
Positioning knowledge is crucial for time-lapse and high-resolution reservoir seismic data. The Qmarine system uses a fully braced acoustic positioning network from the front to the tail of the streamers, independent of streamer length, bringing seismic positioning accuracy to a new level.