Nebula 3D is a large, long-offset BroadSeis™ survey located in the prospective Campos and Santos Basins offshore Brazil. Phase I covers approximately 17 700 km2 on the southeastern side of the survey area providing 3D data coverage where currently no other 3D data exists. Phase II covers approximately 10 000 km2 on the northern side of the survey area with underlying broadband datasets that will provide input for dual-azimuth imaging.
The Nebula Phase II dual azimuth data will better illuminate pre-salt events and address significant challenges posed by thick volcanic layers in this portion of the survey. CGG’s Subsurface Imaging Center in Rio de Janeiro will employ state-of-the-art processing technology including Interbed Multiple Attenuation and proprietary Time-lag FWI to dramatically improve the velocity model and produce clearer, more focused subsurface images of this prolific pre-salt area.
Commencement of Phase II is expected early December and acquisition will be carried out by Shearwater’s Oceanic Sirius. Fast track results are expected in 4Q21 and final products are expected in 1Q22, which will include a TTI Kirchhoff PSDM, a TTI RTM 45Hz and a LSRTM 45Hz.
Sophie Zurquiyah, CEO CGG, said: “The Brazilian Pre-Salt is the largest worldwide oil discovery in the last decades and it is the most important exploration play in the world, highly coveted by all supermajor oil companies and by new players willing to enter in this prospective sector. This addition to our already very large 3D multi-client library in the Santos and Campos basins underlines our commitment to offering the industry ultramodern data sets to support optimised exploration and development of the entire pre-salt area.”
Read the article online at: https://www.oilfieldtechnology.com/exploration/27102020/cgg-preparing-for-second-phase-of-nebula-3d-survey/