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Tamannai M.S.,PGS | Hansen T.,PGS | Borsato R.,PGS | Greenhalgh J.,PGS | And 2 more authors.
75th European Association of Geoscientists and Engineers Conference and Exhibition 2013 Incorporating SPE EUROPEC 2013: Changing Frontiers | Year: 2013

The study addresses the hydrocarbon prospectivity of offshore Gabon with a particular focus on the South Gabon Basin based on detailed 3D PGS/DGH MegaSurvey seismic and well data interpretation. It describes the geology, structure and hydrocarbon potential of the South Gabon Basin. The Gabon Basin consists of three sub-basins; the North Gabon, South Gabon and the Interior Basin. It is located within the larger Aptian Salt Basin of equatorial West Africa that stretches from southern Cameroon to Angola. Both the North and South Gabon basins have been found to be potentially prospective during this study. The pre-salt section is structurally complicated as compared to the post-salt section and it has been difficult to image seismically. Numerous structural and stratigraphic traps have been identified and evaluated. Fan/channel systems have been mapped in both pre- and post- salt sections. Within the deeper pre-salt section, tilted fault blocks containing high amplitudes have been mapped suggesting potential sand presence and possible DHIs. Post salt sediments are dominated by 4-way dip closures and stratigraphic trapping mechanisms. Copyright © (2012) by the European Association of Geoscientists & Engineers All rights reserved.


Greenhalgh J.,PGS | Borsato R.,PGS | Findlay R.,PGS | Raussen S.,PGS | And 4 more authors.
72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 | Year: 2010

This paper outlines examples of potential new reservoir channel and canyon features observed in the interpretation for the Gabon MegaSurvey. The canyons occur at the Base Miocene Unconformity and the channels are imaged at the Ozouri formation and offer exciting new exploration opportunities. Their relevance and origins are discussed with respect to the regional geology. The interpretation describes the various methods used to image these canyons and channels. Methods, that can be incorporated into a workflow that will define a potential prospect to drill. The well developed canyon and channel systems identified in the Gabon offshore area is a potential new reservoir target similar to prospects targeted in the Niger and Congo deltas. © 2010, European Association of Geoscientists and Engineers.


Raussen S.,PGS | Borsato R.,PGS | Findlay R.,PGS | Greenhalgh I.,PGS | And 4 more authors.
72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 | Year: 2010

This paper outlines examples of near surface fluid and gas flow features observed in the seismic interpretation of the Gabon MegaSurvey. Features range from lone craters on the seabed to clusters of pockmarks that appear to have random distribution patterns and other clusters that have a clearly defined linear or channel-like trend. A description of the various pockmark features are given with possible explanations of their formation. The significance of pockmarks is described in the potential for hydrocarbon reserves and the importance of mapping them for sea floor hazards. Numerous amplitude anomalies are associated with these pockmarks as observed in the seismic data. These amplitude anomalies are potential hydrocarbon indicators which afford shallow drilling opportunities and reserves. Pockmarks also help to identify areas of seabed hazards for oil field operations. There is significant value in these pockmarks both in hydrocarbon reserves and oil field safety. © 2010, European Association of Geoscientists and Engineers.

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