Why Sierra Leone?
Discoveries along the northern South American coastline have influenced the potential prospectivity offshore Sierra Leone in recent years.
Sierra Leone's more than 400 km of Atlantic coastline can be tectonically reconstructed back to fit with the Guyana Basin. The exploration success in that region has led to truly world-class oil discoveries (9 Bbbls at the date of writing, but with ever-growing satellite discoveries could be as large as 15 Bbbls), which should be waiting in their eastern twin in Africa.
In May 2022, the Petroleum Directorate of Sierra Leone (PDSL) launched its 5th License Round. It also reiterated an 8-point plan to streamline the petroleum license process that awards within 85 days of application and provide an investment environment to encourage international O&G companies to explore Sierra Leone's offshore waters. Studies of the extensive seismic coverage in the area indicate potential multi-billion barrel prospects, presenting an exceptional exploration opportunity.
Over 63,643 km2 of open acreage is available in the fifth round, delineated into 56 blocks, each covering approximately 1,360 km2. The Directorate has indicated that at least three of these graticular blocks constitute a Contract Area.
The formal bid submission deadline is now extended to Friday, September 29th, 2023, at 12:00GMT. This will allow interested companies to become pre-qualified and complete their technical evaluation.
Our Data Coverage
TGS holds around 11,000 km2 of 3D Pre-Stack Time Migrated (PSTM) seismic data and over 16,000 line km of 2D Pre-Stack Depth Migrated (PSDM) data. These surveys are also offered with gravity and magnetics data. Interpretation products are available from TGS.
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Sierra Leone's Geology
So far, there have been eight wells to test the deep-water setting in the continental slope. All have been submarine fan systems with prominent AVO anomalies. There is further evidence to suggest that there are also entirely untested opportunities for commercial discoveries in the basin floor fans as well as in the more proximal northern domain of the Sierra Leone basin. These formed during the transpressional events during the rifting and microplate rotations.
The transpressional component at the margin uplifted rift basins beneath the upper slopes. The water depth ranges over these are favorable for drilling at less than 2400m. The syn-rift contains many structural traps, and the erosion of these sediments indicates sea-level fall, thus allowing for the deposition of shallower water sand-prone sediments within the perched rift basin. Examples of these shallower water sediments include braided channels and fan systems within stratigraphic pinch-out traps. The presence of progrades up-dip also implies that sand-prone fan systems are.
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