Scotia Leviathan - NS 100 Pre-stack Depth Migration

TGS has been a leader in offshore Canada with deepwater 2D grids that cover the Nova Scotia, Newfoundland, and Labrador offshore areas.    TGS has completed over 160,000 kilometers of 2D pre-stack depth migrated data in the Gulf of Mexico, Bahamas, Canada, and Brazil.  This expertise has now been applied to 27,400 kilometers of the NS 100 survey covering offshore Nova Scotia to better image deep water salt and associated geology.

Offshore Nova Scotia is challenging and structurally complex.  Autochthonous and allochthonous salt structures are present in this area.  Mesozoic and lower Tertiary sequences are well recognized in this new data.  Deflated salt autochthons loaded predominantly by Cretaceous sediments exhibit rollover structures.  Diapiric salt structures and salt canopies are common.  Many salt canopies show Roho structures.  The salt movement is primarily influenced by deposition of a pre-Tertiary sediment wedge that compares significantly to the Gulf of Mexico. 

A number of imaging challenges are present due the undulating water bottom, complicated salt, and the carbonate bank.  The Scotia Leviathan project utilizes a 3D velocity model to facilitate the best imaging and line ties possible.  The example line demonstrates the improvements in imaging once the effects of a rugous water bottom have been modeled and depth migrated.

For more information, please contact:

Kim Abdallah
713 860 2120
jkima@tgsnopec.com

Mike Hebert
713 860 2125
mikeh@tgsnopec.com