As said, the Tumaco Basin deepens and becomes wider toward the southwest. Its main depocenter is located near and eastward the Tumaco bay and reaches depths of about 9 km, as interpreted from magnetic and gravimetric data obtained by airborne methods.

The Chaguí-1 well was drilled on an anticline cored by a mud diapir and showed oil and gas manifestations. Biostratigraphy of the Majagua-1 well indicates that the well ended in Miocene rocks. Finally, the Remolino Grande-1 well was drilled on a basement high, and delivered liquid hydrocarbons from wall-side cores.

The presence of structural traps produced by fault propagation folds, strike slip fault systems, mud diapir structures and flower structures among others, if formed before the expulsion time, combined with the presence of late Miocene seal rocks (mudstones), suggests that the basin provides interesting exploratory opportunities.

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