C006 ACQUISITION AND PROCESSING OF SPARSE 3D DATA IN COLOMBIAN FOOTHILLS: TANGARA 3D SURVEY Abstract 1 A 3D survey was acquired in 2002-2003 over the Tangara structure in the Llanos basin of Colombia. The sparse 3D design already used by several operators in the foothills of Argentina and Bolivia has also been implemented to acquire this survey. This sparse design is characterised by large shot line and receiver line intervals adapted to the target depth. The lines are also slalomed to avoid the obstacles of this difficult mountainous environment. The processing was performed independently by three processing centres. The Tangara


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