Isometrix multicomponent streamer system
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Our unique and proven Isometrix technology leads the industry in acquiring superior quality broadband data.
At the heart of Isometrix technology is a revolutionary seismic streamer. This combines standard hydrophone (P) measurements with two accelerometer sensors recording the seismic pressure gradient in the vertical (z) and cross cable (y) directions. Multicomponent measurements (Pzy) enables 3D receiver de-ghosting, providing deeper insight into the Earth’s complexity.
Isometrix technology is enabled by a revolutionary streamer design that combines measurements of the total seismic pressure wavefield and its gradient—both vertically and crossline. Isometrix uses point-receiver technology and combines hydrophones with tri-axial microelectromechanical system (MEMS) accelerometers, which measure the full bandwidth of particle acceleration of the seismic wavefield. The multicomponent streamer has an environmentally responsible, ‘zero-spill’, solid design with high rigidity, which increases robustness in harsh marine conditions.
Streamer noise mitigation
Particle motion sensors are extremely sensitive to vibrations within the cable itself. A critical consideration in the development of Isometrix technology was understanding the noise modes that propagate along the streamer and how they vary with the streamer construction and the dependency on sensor positioning. Dense point receiver sampling of the accelerometers is the key enabler for accurately characterizing and then removing these noise modes, particularly at low frequencies. Powerful noise suppression has been shown to provide reliable signal from the accelerometers well below 10 Hz. For a typical spread of 12 streamers of 8-km length, over 500,000 active sensors are continuously recording for every shot record in a seismic survey, resulting in a step change in data volume to store and process efficiently
Ocean waves create noise in the measurements, particularly when streamers are towed close to the sea surface. Conventional seismic surveys are prone to significant non-productive time because of adverse weather and sea states. The 3D de-ghosting capability means Isometrix technology can be towed deeper than conventional systems across the full offset range. This helps boost the low frequency content, as well as providing access to quieter environments without compromising temporal bandwidth