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A Consistent and Integrated High-Resolution Stratigraphic Framework for the Sokor Alternances in the R3 East Area, Agadem Basin, Niger
- Source: First Break, Volume 42, Issue 10, Oct 2024, p. 35 - 42
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- 01 Oct 2024
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Abstract
The Palaeocene-Eocene age Sokor Alternances Formation is interpreted as having developed in ephemeral lakes similar to modern-day examples in the East African Rift system. The Alternances is considered the most prolific hydrocarbon-bearing succession in the Agadem Basin. However, there have been few attempts to fully describe its stratigraphy. Previous authors have divided the Alternances into a different number of stratigraphic units using a range of lithostratigraphic and sequence-based nomenclatures. The inconsistency on the different stratigraphic frameworks presents considerable challenges when correlating the Alternances across the basin.
This paper summarises the findings of a study targeted at delivering a detailed and consistent interpretation of the Sokor Alternances stratigraphy. The study sought to integrate a basin-scale seismic stratigraphic framework with more detailed analysis of stacking patterns from well logs.
Three different seismic facies referred to as stratigraphic units were recognised across the study area. Depositional stacking pattern analysis made it possible to subdivide these three large-scale units into a high-resolution stratigraphic framework. There is evidence that this stratigraphic framework can be extended across the basin as a consistent regional stratigraphic system. Furthermore, the high-resolution stratigraphic framework demonstrates the importance of the different stratigraphic units on discovery trapping mechanisms.