Seismic Survey
Optimising bandwidth key to detailed subsurface imaging
Optimising bandwidth is a key consideration for the numerous new seismic programmes that have just got underway. Sean Ottewell reports.
La optimización del ancho de banda es un factor clave para los numerosos nuevos programas sísmicos que se han puesto en marcha recientemente, informa Sean Ottewell.
Die Bandbreitenoptimierung ist ein entscheidender Punkt bei den vielen neuen Seismikprogrammen, die kürzlich gestartet wurden. Sean Ottewell berichtet.
I
n what is the largest marine seismic programme ever acquired in the country, CGG has been awarded a contract by a subsidiary of Anadarko Petroleum Corporation and partner
Ecopetrol to acquire and process a 5500 km2
3D BroadSeis seismic survey on
the Caribbean coast offshore Colombia. Tis will also be the first proprietary BroadSeis survey to be conducted in the country. Te survey, covering portions of the Col 5, Ura 4, Fuerte Norte, Fuerte Sur and Purple Angel blocks, will be acquired by the CGG Viking (Fig. 1) towing a 10 x 100 x 7050 m spread in a BroadSeis configuration using steerable Sercel Sentinel solid streamers and CGG’s proprietary Dovetail efficient acquisition solution designed to achieve more regular sampling and reduce infill. Te survey will start in the third quarter of 2013 and is expected to take four months. Te survey data set will be processed in CGG’s Houston data centre. BroadSeis, CGG’s broadband marine solution, offers market-leading bandwidth, which will enhance imaging in this geologically challenging area
known for its heavy faulting and strong multiple mask. BroadSeis will provide improved resolution of shallow targets and better penetration for the imaging of deeper objectives. Jean-Georges Malcor, ceo CGG, said:
“We look forward to working closely with Anadarko to maximise the benefits of BroadSeis for unlocking the potential of Colombia, a country where we have acquired ten surveys since 2006.” For its part, WesternGeco has begun acquisition of a major multi-client seismic survey offshore Mozambique using the ObliQ sliding-notch broadband acquisition and imaging technique. Te technique optimises the recorded bandwidth of the seismic signal enabling more detailed imaging of the subsurface and more reliable extraction of rock properties.
“Tis seismic survey is optimally located to help oil and gas companies evaluate play potential offshore Mozambique,” said Carel Hooykaas, president, WesternGeco. “Te ObliQ technique is expected to provide valuable high-resolution broadband imaging in this geologically complex area where
Fig. 1. Viking will be used by CGG for a four-month seismic programme offshore Colombia. Image courtesy of CGG Veritas.
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