Caracterização de litofácies sedimentares e ambientes deposicionais com base na análise de testemunho de sondagem do furo jog16n-6 da bacia carbonífera de Maniamba Niassa

Abstract

The scientific project entitled "Characterization of Sedimentary Lithofacies and Depositional Environments based on the analysis of borehole core from borehole JOG16N-6 in the Maniamba Coal Basin, Niassa" aims to investigate the depositional systems and sedimentary lithofacies of the Manimba Coal Basin, located in the Niassa Province, in northern Mozambique. Depositional systems and sedimentary lithofacies play a crucial role in determining the quality of reservoir and hydrocarbon-generating rocks, fundamental elements in the petroleum system.

This study aims to enrich the geological knowledge of the region regarding the Karoo geological formations through the characterization of sedimentary lithofacies obtained from borehole cores taken in analogous sedimentary basins such as the Maniamba Coal Basin (Niassa). It is in this basin where the core from borehole JOG16N-6 was obtained. The methodology of the work includes the characterization of the lithofacies considering aspects such as color, granulometric and mineralogical composition, as well as sedimentary structures.

The results obtained revealed the existence of eleven lithofacies, ranging from conglomeratic sandstones to clayey shale, including carbonaceous lithofacies that have the potential to be hydrocarbon source rocks. These lithofacies were grouped into three associations: A (braided fluvial depositional systems), B (lacustrine-deltaic and associated swamps), and C (meandering fluvial systems). The definition of these associations was based on the proportion of the dominant load type, the presence of organic matter, and granulometric variations.

In summary, the Karoo formations may have played a significant role in the Rovuma Basin petroleum systems, highlighting the importance of this study for future investigations into the region's energy potential.