GEOCHEMICAL CHARACTERIZATION AND CORRELATION OF SOURCE ROCK AND NATURAL GAS, AND ONE-DIMENSIONAL BASIN MODELING IN MADURA SUB-BASIN, NORTH EAST JAVA

• Main Author: Agi Nurluthfi, Faizal
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/69730
• Institution: Institut Teknologi Bandung

The increasing demand for oil and gas energy needs to be balanced with effective production. The effective production of oil and gas can be achieved by evaluating the petroleum system. This study focuses on understanding the source rock in the Madura Sub- Basin. The analysis in this study includes characterization of the source rock (quantity of the organic material, type of the organic material, and maturity of the organic material), geochemical correlation, and one-dimensional basin modeling. The data used in this study are from six exploration wells of PT Medco Energi. The 441 rock-geochemical data were selected and resulted 70 data for analysis. The analysis of this study was also carried out on 17 data of natural gas to determine the type of gas and its correlation with the source rocks in the study area. There are two formations in the study area, which have the source Rock potential, those are Kujung II Formation and Tuban/Kujung I Formation. Based on their geochemical characteristic, the gas samples in this area consist of biogenic gas, which derived from the marine environment and thermogenic gas in the form of associated gas. The thermogenic gas in this area was suspected to be derived from Kujung II Formation, which was already in a state of overmature. The burial history curve shows that in the study area, there were two tectonic phases, post-rift phase in the Early Oligocene to Late Miocene (33.2–5.8 Ma) and inversion phase in the Late Miocene (~5.8 Ma) until now. The SR-1 basin model shows that the early maturity of the Kujung II Formation occurred in ~1.82 Ma and at the Tuban/Kujung I Formation occurred in ~1.31 Ma. The SR-2 basin model shows that the early maturity of the Kujung II Formation occurred in ~19.30 Ma and at the Tuban/Kujung I Formation occurred in ~5.72 Ma.