Study of Cretaceous Sequential Stratigraphy and Sedimentary System in Termit Basin of West Africa

Abstract

Abstract: Guided by the basic theories of sequential stratigraphy and sedimentology, the study is made of Cretaceous sequential stratigraphy and sedimentary system in Termit Basin of West Africa for the purpose to determine target stratum series and areas in the next exploration stage. The study indicates that the Cretaceous system in Termit Basin can be divided into two secondary sequences, 10 tertiary sequences and 28 quaternary sequential units. TS1 sequential sedimentation of the Early Cretaceous was controlled by fractural activities and filled mainly in the pattern of fault-controlled steep slope to fault-controlled gentle slope. TS2 sequential sedimentation of the Late Cretaceous came under the influence of the Tethys Ocean and South Atlantic transgression. The sedimentary paleao-environment experienced “land-ocean-land” development. The sedimentation was filled mainly in the pattern of flexure slope break and sedimentary slope break. Material sources are located mainly in the eastern part of Termit Basin, where, sedimentary systems of various types developed, such as fan delta, braided river delta, near shore subaqueous fan, far shore subaqueous fan and littoral-neritic sea. Controlled by provenance and sedimentary facies, vertically, DSQ1 and DSQ2 low-level system domain and YSQ1 and YSQ2 high-level system domain have good conditions for reservoir-cap assemblage and are the targets for exploration of the Cretaceous System. On the plane, successive development of positive structural zones like Fana low uplift and Yogou slope are the favorable zones of oil and gas migration and accumulation, which are the targets for next-stage exploration.

Tang Ge, Sun Zhihua, Su Junqing, Tang Xinping. Study of Cretaceous Sequential Stratigraphy and Sedimentary System in Termit Basin of West Africa[J]. China Petroleum Exploration, 2015, 20(4): 81-88.

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