Abstract:

Based on integrated analysis of seismic and well logging data, the AG Formation, a supersequence, in the Nugara Depression
of Muglad Basin of Sudan can be subdivided into five 3rd order sequences named SQA~SQE from the bottom to the top. The
characteristics of each sequence boundary are clearly shown in both seismic profiles and well logs. In the sequence stratigraphic
framework, according to the internal reflection textures and external geometric configurations and in combination with characteristics of
seismic amplitude, continuity and frequency, five seismic facies are identified in the AG Formation including parallel-subparallel sheet,
wedge shaped, foreset, moundy and unorganized seismic facies. These seismic facies can help build the evolution model of sedimentary
facies because these facies should be continuous and can be inherited. The normal delta, braided delta, fan delta, lacustrine system and
alluvial fan can be recognized based on seismic data, well data as well as cores. The seismic-sedimentary facies evolution and its
controlling factors are also analyzed in this paper.

Key words: Muglad Basin；Abu Gabra Formation；sequence stratigraphy；seismic facies；sedimentary facies