Lower Cretaceous Sequence Stratigraphy of Fula Depression, Muglad Basin, Sudan

Key words: 
• Muglad Basin /
• sequence stratigraphy /
• rift basin /
• depositional system /
•  /

Abstract: Abu Gabra Formation of Cretaceous Fula depression, which is formed during the first rifting cycle, can be divided into three secondorder sequences, namely, sequence K1SSI, sequence K1SSII and sequence K1SSIII. They can correspond separately to the strata deposited in the early, middle and late rift period. Of the three secondorder sequences, the sequence K1SSI and sequence K1SSIII can be subdivided into two thirdorder sequences, the sequence K1SSII into three thirdorder sequences. Based on the integrated analysis of seismic data, core and well logging, the distribution of sedimentary facies and the prediction of sedimentary system are achieved. Through investigation, 7 types of sedimentary facies are recognized, namely, fluvial deposit, delta, fan delta, braided delta, proximal sublacustrine fan, lacustrine facies.
Due to the evolution of their sedimentary facies, five chief depositional systems are established in the Fula depression. They are fan delta system in the NE, delta system in the NW, proximal sublacustrine fan in the west, braided delta system in the ES and fluvial system produced in the early period. The distribution and evolution of the depositional systems is controlled by tectonics, probably influenced by paleotopography and paleogeography.