The offshore region of Sierra Leone and Liberia has been underexplored on the continental shelf and unexplored in deepwater. However, a reconnaissance interpretation of new 2D seismic data, in conjunction with a review of the reservoir and geochemical information available to date, is positive about the hydrocarbon potential of the region. Three distinct prospective hydrocarbon basins are present—Sierra Leone Basin, Liberia Basin, and Harper Basin (Figure 1).

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Nine exploratory wells have been drilled and abandoned on the shelf, at the limits of the study area, considerably shoreward of the potential deepwater basins. In terms of exploration maturity, considering...

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