Burial History Modeling of the Mallawa Formation and Balangbaru Formation Makassar Basin, South Sulawesi Province

Abstract Makassar Basin estimated to have hydrocarbon potential and is considered a source rock. The study aims to identify formations with potential as source rocks, based on the geochemical characteristics of source rocks and the burialhistory in the research area. The analysis was conducted on single research well. From the study conducted on one well, source rock samples were obtained from the Mallawa Formation and Balangbaru Formation, which were further analyzedin geochemical analysis. The method employed in this research involves analyzing geochemical characteristics (quantity, quality, and maturity level), including Total Organic Carbon (TOC), Rock Eval-Pyrolisis (REP), Vitrinite Reflectance (VR), Van Krevelen Diagram, HI and Tmax Cross-plot. Burial history is analyzed using Petromod 1D software this software can create burial history graphs used age data, top formation, biostratigraphy (paleo water depth), lithology, and TOC values. From this data, burial history modeling can be generated. The quantitative and qualitative analysis results indicate that the potential source rocks are the Mallawa Formation and Balangbaru Formation, based on the organic material content (total organic carbon). The Mallawa Formation has TOC values ranging from 0.77% to 6.11%, with Fair to Excellent quantities, type III kerogen indicating that this type of kerogen is derived from woody terrestrial material. It is rich in carbon and produces primarily gas when heated, and Immature maturity, while the Balangbaru Formation has TOCvalues ranging from 0.03% to 7.41%, with Fair to Excellent quantities, type II/IIb kerogen is also rich in hydrogen but produces a mix of oil and gas when heated, and Immature to Peak Mature maturity. Based on the research results, it is inferred that source rocks in the Mallawa and Balangbaru Formations have the potential to generate hydrocarbon productssuch as oil and gas. The burial history of the source rocks in Well AYP-1 is controlled by the sedimentation rate, basin subsidence rate, and tectonics.