Résumé : New detailed lithological, sedimentological, major chemical, δ13C and δ18O stable isotopes data were obtained from exploration drilling samples on carbonate formations of the Neoproterozoic Schisto-Calcaire Subgroup (> 635-575 Ma) in the Lukala area (Bas-Congo, Democratic Republic of the Congo). This work characterizes and reinterprets the stratigraphical succession from the C2 (Bulu) up to the C4 (Lukunga) formations. The C3 (Luanza) Formation is subdivided into four submembers and the transition of the C3 Formation with both the C2 and C4 formations is examined. New δ13C and δ18O stable isotope data obtained complete the dataset for the Schisto-Calcaire Subgroup in the frame of a correlation with the same succession in Gabon and the Republic of the Congo. The aged equivalent stratigraphic units and lithologies of the West-Congolian (WCB), Katangan (CAC) and Bambuí (SFB) successions are examined, compared and coupled with the available carbon and oxygen isotope values, and a regional correlation is proposed.