Analisis Kematangan Batuan Induk Hidrokarbon di Formasi Naintupo, Sub-Cekungan Tarakan, Provinsi Kalimantan Utara

[Title: The Maturity Analysis of Hydrocarbon Source Rock in the Naintupo Formation, Tarakan SubBasin, North Kalimantan Province] The Tarakan Sub-Basin, located in North Kalimantan Province, is estimated to have the hydrocarbon potential of around two billion barrels of oil equivalent (BOE). This study aims to analyze the maturity of the source rock and the hydrocarbon potential in the Naintupo Formation, Tarakan Sub-Basin. The method used in this study is the analysis of Total Organic Carbon (TOC), Vitrinite reflectance (Ro), Hydrogen Index (HI), Tmax, Potential Yield (PY), S1, Oxygen Index (OI), and Oil Production Index (OPI). This research shows that the Naintupo Formation is an effective source rock with TOC between 1.02-5.92 wt.%, HI 52-115 mg HC/gr TOC, Ro 0.62% -1.84%, Tmax 436oC -468oC, S1 0.17-0.32, and OPI 0.15-0.4. The type of hydrocarbon with the greatest potential is natural gas. The largest natural gas potential is in the South Sembakung-1, Tanjung Bimau-1, Sesayap E1, and Tanjung Kramat-1 Wells. This study concludes that the Naintupo Formation has the potential to produce the natural gas in the Tarakan Sub-Basin.