This study compares five deepwater fields, Mars and Diana in the Gulf of Mexico and Roncador, Marlim and Albacora Leste offshore Brazil. These reservoirs occur in basin floor fan, prograding wedge and slope fan systems tracts. Recently acquired 2D seismic data show them to consist of high amplitude high continuity and hummocky lower continuity reflectors. The Gulf of Mexico field examples occur in minibasins surrounded by massive allochthonous salt canopies. The Brazil examples are controlled by massive but autochthonous salt. Hydrocarbon migration into the Brazil fields is from a syn-rift source via large faults, which breach the salt where it is welded. Migration into the minibasins of the Gulf of Mexico is more complex due to the allochthonous salt but will probably be via salt-welded minibasin floors.

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