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Title: Rift basins of interior Sudan: petroleum exploration and discovery

The sedimentary basins of interior Sudan are characterized by thick nonmarine clastic sequences of Jurassic(.)-Cretaceous and Tertiary age. Over 45,000 ft (13,716 m) of sediment was deposited in the deepest trough and extensive basinal areas are underlain by more than 20,000 ft (6096 m) of sedimentary rocks. The depositional sequences include thick lacustrine shales and claystones, flood plain claystones, and lacustrine, fluvial, and alluvial sandstones and conglomerates. Those lacustrine claystones deposited in a suboxic environment provide good oil-prone source rocks. Reservoir sandstones have been found in a wide variety of nonmarine sandstone facies. The extensional tectonism that formed these basins began in the Jurassic(.)-Early Cretaceous. Movement along major fault trends continued intermittently into the Miocene. This deformation resulted in a complex structural history that led to the formation of several deep fault-bounded troughs, major interbasinal highs, and complex basin flanks. This tectonism has created a wide variety of structures, many of which have become effective hydrocarbon traps. During the past eight years, several important oil discoveries have been made. Significant accumulations have been delineated in the Heglig and Unity areas, where estimated recoverable reserves are 250-300 million bbl of oil. 14 figures.
Authors:
Publication Date:
OSTI Identifier:
6025793
Resource Type:
Journal Article
Resource Relation:
Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States); Journal Volume: 72:10
Research Org:
Chevron U.S.A. Inc., Englewood, CO (USA)
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; PETROLEUM DEPOSITS; EXPLORATION; SUDAN; ALLUVIAL DEPOSITS; CRETACEOUS PERIOD; GEOLOGIC HISTORY; GEOLOGIC STRUCTURES; GEOLOGIC TRAPS; JURASSIC PERIOD; SANDSTONES; SEDIMENTARY BASINS; TERTIARY PERIOD; AFRICA; CENOZOIC ERA; DEVELOPING COUNTRIES; GEOLOGIC AGES; GEOLOGIC DEPOSITS; MESOZOIC ERA; MINERAL RESOURCES; RESOURCES; ROCKS; SEDIMENTARY ROCKS 020200* -- Petroleum-- Reserves, Geology, & Exploration