23. Suriname – Kwaskwasi Prospect, Block 58, Apache

Kwaskwasi-1 well, Bl.58, Apache

23. Suriname – Kwaskwasi Prospect, Block 58, Apache – V.15.05.20

The well was spudded second half April 2020. Should be closer to TD, logging, testing by this time.

Well coordinates (drillship Noble Sam Croft):

7.46573 N / 56.12068 W.

Objectives: Upper Cretaceous fans.
Similar to the 2 previous substantial discoveries Maka Central #1 and Sapakara West-1.

Chasing hydrocarbons in multiple stacked targets in the Upper Cretaceous, Campanian and Santonian intervals.

My best guess ?
Discovery nr. 3, with high-value light oil and condensate; most probably, hopefully.

Why ?
Is located just in between previous 2 discoveries. With the same discovery-prone hydrocarbon habitat characteristics. Mature/late mature kitchen still active, light oil and condensate. Multiple good reservoir sands and top seals.

On trend and represents the eastern part of the Liza-Sapakara discovery trend ( “ Guiana-Suriname Golden Lane “).

Sapakara West-1 results ?

Total 79 meters (259 feet) of net oil and gas condensate pay in two intervals.

Equals ??? million bbls reserves ?

The shallower Campanian interval contains 13 meters (43 feet) of net gas condensate and 30 meters (98 feet) of net oil pay, with API oil gravities between 35 and 40 degrees.

The deeper Santonian interval contains 36 meters (118 feet) of net oil-bearing reservoir with API oil gravities between 40 and 45 degrees.

Tertiary reservoirs, in general ?

May contain heavy, biodegradated, low commercial oil.

Similar to the Tullow discoveries in 2019 in Guyana.

Paleocene-Oligocene deep marine sandstone reservoirs.

Jethro-1 well, Orinduik block, 55m net heavy oil pay in good Lower Tertiary reservoir sands.

Joe-1 well, TD at 2175 m, 14 m net pay in Upper Tertiary, heavier oil than Jethro-1 and with high sulphur content.
This as the reservoirs received the oil while at rather shallow depth (wrong timing). At some 800 – 2500 m depth, thus within biodegradation range.

Before being buried deeper, to their present depth. Related with the thick Late Miocene (especially Tortonian) interval deposited on top of them.

The Tortonian – Recent sediments sediment wedge if very thick. It coincides and is due to an important uplift and erosion cycle of the Roraima Province.

Shelf-edge wells may all present this problem in the Tertiary interval.

Hydrocarbon generation from Canje SR in this basin started between 10 – 5 Ma and continues at present.


My remarks (pre- and postdrill) on Maka Central and Sapakara discoveries, in posts 21 and 22.

Many posts on Guiana-Suriname Basin.

” Why is there Heavy Oil in Cenozoic Reservoirs Offshore Guyana ” 2020, by Halliburton, R. James, J. Schotschman and R. Head

Reports Tullow and Apache

Kwaskwasi-1 well, Bl.58, Apache
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Kwaskwasi-1 well, Bl.58, Apache


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