ANALYSIS OF HYDROCARBON FILLING IN THE KUJUNG RESERVOIR UNIT 1 USING 2D BASIN MODELING IN THE NORTHEAST JAVA BASIN

• Main Author: Akbar, Andri
• Format: Theses
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/79849
• Institution: Institut Teknologi Bandung

The JS-1 Ridge high is flanked by the Central Depression in the east, and the East Bawean Trough in the west. This low is filled with the source rock of the Ngimbang Formation which has matured, migrated, and filled the reservoir rock of the Kujung Unit 1 Formation in the Northeast Java Basin. This object study focuses on Geochemical, Thermal Maturity Modeling and Hydrocarbon Filling to identify the potential of the two lows as hydrocarbon kitchens. Apart from that, knowing which lowlands have the greatest contribution to producing hydrocarbons is necessary to map possible hydrocarbon migration routes in detail, especially for exploration prospects that have not been drilled in this area. The research method will focus on modeling hydrocarbon maturity and filling by integrating seismic data, well data and biostratigraphic data supported by geochemical analysis data to produce a model of hydrocarbon migration and filling in the research area. Geochemical analysis of the source rock of the Ngimbang Formation from several wells shows a range of average total richness of organic material (TOC) of 1.04- 3.56%, with kerogen type II/III with a tendency to produce oil and gas and has a maturity level of immature to just mature (Immature-Early Mature). However, the equivalent analysis of vitrinite reflections from oil and gas extraction shows that the migration and filling of hydrocarbons originates from a maturity of 0.64 to 1.43%Ro, which indicates that the hydrocarbons are not in situ. Biomarker analysis of oil extraction shows that the source rock environment originates from a fluviodeltaic type of environment. The results of thermal maturity modeling show that the Central Depression started the beginning of maturity in the Early Miocene and the East Bawean Trough started in the beginning of maturity (0.60% Ro) in the Middle Miocene, and currently both are at the overmature stage (1.35% Ro). Reconstruction of the geological structure carried out during the Pliocene clearly shows that the migration direction and hydrocarbons filling from the Central Depression is more dominant towards production fields & exploration prospects in the JS-1 Ridge high compared to the East Bawean Trough.