Publications

The geological complexity in north Serayu basin make it as �Terra Incognita� in oil and gas exploration field in northern Java. As one of the challenge in oil and gas exploration, it can be used to know the petroleum system and the approach to reduce failure risk in exploration activity. This research aims to know the petroleum system in north Serayu basin specifically in Paguyangan, Brebes, Central Java. Methodology in this research is geological mapping method consist of facies and environmental sedimentation analysis, Total Organic Carbon (TOC) analysis, and petroleum system analysis. This research proceeds from observation of rock layers arrangement in detail consisting of sediment structure, sedimentation environment, fossil composition contained in the rocks, and stratigraphy that grown in research area, which later grouped into some facies type. According to the field data and laboratory data analysis, it can be found that Rambatan Formation has good potential as source rock. The emergence of oil seepage in research area shows that there is petroleum system that can be found in channel filler rocks such as pebbly sandstone from Halang Formation that is interpreted as reservoir zone. Meanwhile, the caprock is interpreted as claystone from upper Tapak Formation. The trap in research area is structural trap that is anticline and thrust fault in Miocene - Pliocene, which possibly happened because of hydrocarbon migration route in late Miocene. From geology cross-section model, it is shown the factor that controls released ydrocarbon is fractures that formed on the peak of anticline. The results of TOC is in low to middle range showed by TOC value 0,43 - 1,2%. Kerogen type of the tested sample shows the kerogen type III and also identified that there is potential to generate a small amount of hydrocarbon into gas.