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The carbonate Bent Jedidi unit represents middle –late Pleistocene continental carbonate deposits in Northeastern Tunisia. The unit consists of three main facies associations; asymmetrically distributed (1) calcrete-palustrine (2) lacustrine, (3) Tuffa carbonate.This study evaluates variations in petrophysical properties within a lacustrine to palustrine and tufa carbonate. The transition from alluvial environments to lake margins settings displays a shift from conglomerate and silt to lacustrine palustrine mudstones to packstones (1) The palustrine carbonates include features like pseudo-microkarst, root cavities, gypsum, nodular and mottled limestone, (2) The lacustrine deposits include charophytes gastropods and ostracods, oxidation oncoids, oncoliths and recrystallization of calcite.(3) The Tufa deposits include, algae filament, mosse Tufa and laminated structure. The evaluation of the facies associations over time demonstrates an overall fall of the relative lake level. High proportion of low energy facies associated with a deeper lacustrine environment. While at the Top predominate high energy facies associated with a shallow lacustrine environment fluctuations in lake water level enabled land plants to occupy the lake margins during periods of low levels for this reason We found chenal porosity. This study aims to identify the depositional facies and the origin and paleoenvironmental significance of lacustrine /palustrine carbonates and tufas in the Pleistocene Bent Jedidi Lake.