Publications

The North East Java Basin has become one of the most promising basins in Indonesia. Over 150 million barrels of oil have been extracted from the Rembang Zone in the North East Java Basin. The Sukolilo outcrop, located in Sukolilo, Bancar, Tuban Regency, East Java, represents all the components of an exposed Middle Miocene petroleum system. The objective of this study is to present an excellent analogue for the depositional environment and petroleum system of the Middle Miocene formation of the Rembang Zone that can be expected in similar subsurface settings and as a tool for outcrop preservation with modelling using photogrammetry. Data consists of measured section, photogrammetry data, petrographic analysis, TOC content measurement and Rock-Eval Pyrolysis. Observed formation at this outcrop includes Ngrayong, Bulu, and Wonocolo Formation. The facies distributed in this outcrop consist of claystone-carbonaceous shale bedded, cross-bedded quartz sandstone, foraminiferal limestone and calcareous siltstone intercalated calcareous sandstone. Based on depositional environment analysis, the depositional environment changes from Lagoon – Tidal Flat – Shallow Marine – Shelf. The result of petrographic analysis shows that quartz sandstone porosity from the Ngrayong Formation can be identified as reservoir rock. Seal rock potential is shown by carbonate minerals diagenesis of the foraminiferal limestone sample. Source rock potential which is identified using TOC content and Rock-Eval Pyrolysis, reveals that the sample tends to be gas prone (kerogen type III) and has low thermal maturity (immature). Ductile deformation (conical anticline) and brittle deformation (normal fault) is predicted to be the migration path for this petroleum system.