This study presents a facies characterization, facies succession and conceptual depositional model of the Coqueiros Formation, Lower Cretaceous of Campos Basin, based on core analyses of two wells. WELL-1 is a shallow water drilling located at south of Campos Basin within the Badejo structural high, and WELL-2 is an ultra deep water drilling located at north, over the “External High”. Ten carbonate facies, three siliciclastic facies, two magnesium clay mineral rich facies and two hybrid facies were identified. The carbonate facies were defined as rudstone, grainstone, packstone and mud supported carbonate rock, composed of bivalves, ostracods, and rare gastropods. Bivalve shells, mostly disarticulated with distinct degrees of fragmentation, characterized the main components of the ten carbonate facies. The siliciclastic facies are sandstones and mudstones, which occur locally. The magnesium clay rich facies is composed by stevensitic claystone and arenites. The mixture of bioclasts, siliciclastic grains, stevensite ooids and peloids constitute hybrid facies. The depositional processes involved waves and storm currents, as well as storm refluxes and tectonically-driven gravitational deposits, which mixed particles from different basinal sites producing the hybrid facies. The conceptual depositional model for each geological setting were elaborated based on facies stacking pattern analysis. A hybrid ramp in rift setting, studied in WELL-1, is characterized by carbonate, argillaceous, siliciclastic and hybrid successions, suggesting a strong terrigenous influence and variation of the lake water chemistry. An isolated bioclastic high in a rift setting, studied in WELL-2, is basically constructed by bioclastic sequences with local occurrence of siliciclastic mudstones deposited from hypopycnal plumes in relatively deep water. The extraordinary dominance of bivalve mollusks occurred during the lower Aptian stage in Campos Basin, in an active rift basin, with robust bioclastic productivity within protected basement highs. In structures near to the lake border, predominated siliciclastic and hybrid rock sequences as a result of high structural gradients and terrigenous input. Isolated highs from lakeshores were protected from external terrigenous influence. In lacustrine deep water bioclastic and hybrid arenites were deposited as fans generated by gravitational flows triggered by destabilization of shallower water deposits during episodic storms and tectonic activities. This study of the coquina deposits constructional model within a nearshore and also in a offshore lacustrine system is a useful knowledge for the understanding of coquina reservoir distribution and is applicable in the exploratory investigation of new areas with correlate lacustrine systems.