Seismo-Sedimentological Reconstruction of Depositional Architecture of Oligo-Miocene turbidites (Offshore Algeria)

The Offshore Algeria Zone East represents a West Mediterranean frontier hydrocarbon exploration area with limited well control. Integrated geological and geophysical studies were conducted in 2024–2025 to evaluate the depositional architecture of a multi-storey turbidite channel, Channel #1 (C#1), hosted within the Oligo–Miocene siliciclastic succession. The C#1 system is interpreted as an erosional, low- sinuosity, multi-phased channel with predominantly sand-prone fills, sealed by a Messinian evaporitic unit and overlain by Plio–Quaternary deltaic to turbiditic deposits. Seismic interpretation, spectral decomposition, and average envelope analyses were carried out to delineate depositional geometries and hierarchical storey-sets evolution. Despite the absence of nearby wells, analogue-based approaches allowed reconstruction of C#1 evolution, highlighting onset, lateral expansion, and abandonment phases controlled by auto- and allocyclic sediment routing.