3D Seismic Delivers Pre-Salt Imaging Offshore South Gabon

Spectrum’s Neil Hodgson and Karyna Rodriguez examine the latest 3D surveys revealing structure never seen before offshore South Gabon. Article published in the July 2018 edition of Offshore Magazine.

In the first five months of 2017 the ground work for a miracle was built over the shallow waters offshore South Gabon.

For over 50 years, oil explorers have been fighting with complications in the geology that have made the oil bearing sequences in this area virtually unresolvable on seismic data. The technical problems were numerous and geologically stacked on top of each other – a hard seabed, and a complex set of rocks varying vertically and deposited on a salt unit which is itself both highly variable in thickness and composition. These create, as we shall see, every sort of difficulty for seismic processing. Taken together, they pose a complex problem for geophysicists to unravel. Indeed, this challenge was thought impossible to overcome until recent evolutions in integrated seismic planning, acquisition, and processing provided tools sophisticated enough to tackle this problem.

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3D seismic delivers presalt imaging offshore South Gabon