Chapter 5: Imaging and mapping 3D multiples to image gathers: Example with a Gulf of Mexico dataset.

In this chapter I illustrate the mapping of 3D multiples to image space with a real 3D dataset from the Gulf of Mexico. The data has all the usual shortcomings associated with marine streamer acquisition: sparse sampling in the crossline direction, small crossline aperture, strong feathering, irregularity in the sail lines and uneven midpoint fold. I use shot-profile migration to compute SODCIGs and from them compute 3D ADCIGs. I show that in this case we can discriminate between primaries and multiples in both inline and the crossline subsurface offsets in SODCIGs and aperture and reflection azimuth in ADCIGs, despite the relatively narrow range of aperture angles that illuminate the subsalt reflectors.