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This paper investigates the sedimentary characteristics, geochemical indicators of source rock, and the hydrocarbon potential in detail within the Paleogene and Upper Cretaceous in the northern Kaikang trough, Muglad Basin. Analysis shows that the thickness of good source rocks in Paleogene ranges from 50 to 200 m, and the TOC value can reach 0.5–1.3%, but it is immature and has no hydrocarbon generation potential. Nevertheless, the Upper Cretaceous source rocks had mostly entered the maturity threshold, with a TOC value of only 0.5–0.8%, and a thickness of only 10 m, so the hydrocarbon generation is limited. The main effective source rock is the AG Group in the Lower Cretaceous, which is distributed throughout the area. The evolutionary history shows that most of the structures in the central troughs lack hydrocarbon potential, because they were formed since the Paleogene, which is later than the main accumulation period of the AG source rock. Petroleum discovery was made in the fault terrace zones on both sides of the Kaikang Trough, but the distribution of oil layers is very complicated. Hydrocarbon accumulation is controlled by formation dips, fault activity intensity and fault lateral docking characteristics. The weaker active fault block in late time and the more effective trap are the key to hydrocarbon enrichment at the fault terrace-zones.
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- Source Rocks and Hydrocarbon Accumulation Characteristics of Upper Cretaceous to Paleogene in the Northern Kaikang Trough, Muglad Basin, Sudan