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 technology uses point-receiver technology and combines hydrophones with tri-axial microelectromechanical system (MEMS) accelerometers, which measure the full bandwidth particle acceleration due to the up- and down-going seismic wavefield. The multimeasurement streamer has an environmentally-responsible, ‘zero-spill’, solid design with high rigidity, which increases robustness in harsh marine conditions.
Multimeasurement Streamer Technology for True Broadband Imaging
Only the three measurements of the IsoMetrix streamer allows full 3D deghosting and dealiasing. Dense wavefield reconstruction provides the only truly broadband product in all three dimensions: inline, crossline, and in depth.
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; how they vary with the streamer construction and the dependency on sensor positioning. Dense single-sensor 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.
Closely spaced single sensors are required to adequately sample noise caused by the motion of the streamer through the water. Here we see various streamer noise modes, including torsional and compressional waves recorded on the accelerometers.