PETROLEUM GEOLOGY OF THE
Dou Lirong1*, Cheng Dingsheng2, Li Zhi2, Zhang Zhiwei2 and Wang Jingchun1
2 African Department, Research Institute of Petroleum Exploration and Development, PetroChina, Xueyuan Road 20, Haidian District, Beijing 100083, P. R. China.
* Corresponding author, email: email@example.com
The Fula sub-basin is a fault-bounded depression located in the NE of the Muglad Basin, Sudan, and covers an area of about 3560 km2. Eleven oilfields and oil-bearing structures have been discovered in the sub-basin. The Lower Cretaceous Abu Gabra shales (Barremian – Aptian), deposited in a deep-water lacustrine environment, are major source rocks. Reservoir targets include interbedded sandstones within the Abu Gabra Formation and sandstones in the overlying Bentiu and Aradeiba Formations (Albian – Cenomanian and Turonian, respectively).
Oil-source correlation indicates
that crude oils in the Aradeiba and Bentiu
Formations are characterized by low APIs (<22°), low sulphur contents (<0.2%),
high viscosity and high Total Acid Number (TAN: >6 mg KOH/g oil on average).
By contrast, API, viscosity and TAN for oils in the Abu Gabra
Formation vary widely. These differences indicate that oil migration and accumulation
in the Fula sub-basin is more complicated than in other parts of
The Aradeiba-Bentiu and Abu Gabra Formations form separate exploration targets in the Fula sub-basin. Four play fairways are identified: the central oblique anticline zone, boundary fault zone, fault terrance zone and sag zone. The most prospective locations are probably located in the central oblique anticline zone.
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