CGG's global geoscience technologies enable you to build comprehensive earth models that support the discovery and responsible management of the Earth's natural resources.
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True vertical and orthogonal OBN sensing with 3C MEMS sensors
1:40 Tuesday August 25
OBN projects are taking an increasing market share over towed streamer surveys. Despite significantly higher costs of operation, OBN enable flexible layout strategies (e.g., for the recording of long multi-azimuth offsets), seismic wavefield recording with high signal-to-noise ratio (stationary sensors located in a low-noise environment), broadband signal recording (exceptional deghosting with receiver ghost well separated from the primary signal, in combination with dual pressure and velocity sensing), the recording of PS waves and a better repeatability for 4D surveys. Until now all OBN available on the seismic market have been equipped with 3C omni-tilt 15Hz geophones however a recently released node offers 3C MEMS sensors as an alternative. MEMS are renowned for their ability to record seismic signal with true amplitudes and phases, from DC to 800 Hz, contrary to geophones whose sensing fidelity varies with manufacturing tolerances, ageing and temperature. In addition, the third generation of MEMS (Lainé 2014, Fougerat 2018) has overcome the low-frequency limitations associated with previous generations. A recent field test could demonstrate that contrary to the case with 3C geophones, 3C MEMS have in addition the ability to measure particle motion along truly vertical and horizontal axes, which is a major benefit for OBN applications.
Assessing the value of source-over-streamer acquisition in the Barents Sea
11:00 Wednesday August 26
We will present an innovative new-generation TopSeis acquisition with dense near-offset illumination and long offsets for FWI applied in a 5000 km2 area over the Greater Castberg area in the Barents Sea. We will highlight how accurate deblending was a key processing step to uncover the potential of these blended data. We will also examine decimation tests so as to compare with conventional and short-offset conventional acquisition approaches. We will also show several examples of the first fast-track volume and compare with vintage data from the area.
CGG are leaders in the processing and imaging of every kind of ocean bottom seismic (OBS), ocean bottom node (OBN), ocean bottom cable (OBC) and permanent life-of-field (LoFS) data.