Isometrix works on a revolutionary streamer design that combines measurements of the seismic pressure wavefield and particle acceleration – in three X,Y and Z components. It’s the only streamer system that can measure the vertical streamer shape between the streamer fin positions thanks to the unique ability of micro-electromechanical system (MEMS) accelerometers to record to 0Hz -- the earth’s gravity field.
Deghosting with the multicomponent data allows for a deeper tow, enriching low frequencies and increasing the weather window to work in. Once deghosted by combining the pressure and acceleration signal the data can be redatumed to any streamer depth to match your baseline or last repeat for the best 4D matching. On top of this, the unique single sensor design allows for any legacy analogue array response to be imprinted on the data, further increasing the match while providing for a new, uncompromised baseline.
We use our point-receiver technology to record the noise as well as the signal unaliased. This way we can remove the noise in a controlled manner and leave the signal part of the recording that we need untouched in phase and amplitude, unlike analogue arrays which leave their imprint on the data in the signal cone. As the signal is safely recorded the data is ready for the processing team to get the data to the next stage of your survey’s goals.
Along with the point-receiver tech, we combine hydrophones with tri-axial MEMS accelerometers, which measure the full bandwidth of particle acceleration of the seismic wavefield.
WHY IT WORKS SO WELL
The Isometrix is a multi-component system made up of pressure and motion sensors. The hydrophones are spaced in pairs every 3.125m (recorded individually), which allows the swell-induced noise to be recorded accurately and unaliased.
The motion noise in the dynamic environment of a towed streamer requires much finer spacing, so we site sensors every 0.625m. In a typical 12 x 8km streamer spread, with P, X, Y and Z more than 500,000 measurements are recorded – an incredible feat of engineering.
But, even more than that, while recording, each measurement is analyzed and QC’d in real-time before moving on to the next step of swell or streamer motion signal-safe noise removal. We know how each and every one of those 500,000 sensors are performing -unlike the traditional analogue arrays where sensors can be weak or malfunction or be noisy but is hidden by the array-averaged response.
Schematic depiction of the Isometrix single sensor layout, showcasing the high-density sampling characteristic of the point-receiver technology. The layout integrates hydrophones with tri-axial micro-electromechanical system (MEMS) accelerometers. Notably, the MEMS accelerometers necessitate a five-fold denser sampling to accurately capture both noise and signal without aliasing. This unique approach enables precise noise removal while leaving the signal component of the recording completely preserved.