OVERPRESSURE STUDY AND PORE PRESSURE PREDICTION IN KENDENG ZONE, EAST JAVA BASIN

• Main Author: PANDU SATRIA (NIM : 22014317), AULIA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/21326
• Institution: Institut Teknologi Bandung

The East Java Basin is one of hydrocarbon producing basins in Indonesia. The study area is located in the eastern part of the East Java Basin. This basin is well known for its overpressure zone. This study uses four onshore wells and four offshore wells. <br /> <br /> Rapid sedimentation is overpressure generating mechanism in the study area. The Eaton’s Method is used to estimate the magnitude of pore pressure. The Eaton’s exponent is 1- 4 for sonic log and 0.8 for resistivity log. These Eaton’s exponents show relatively good match with direct pressure measurement and mud weight data. <br /> <br /> Density-sonic crossplot shows no clay diagenesis and all the data are located in the early diagenesis stage. The analysis of source rock maturation indicates that the source rock is still in immature stage, implying that there is no hydrocarbon generation in the study area. <br /> <br /> The top of overpressure in the study area is located in Pliocene-Pleistocene sediments. The variation in the top of overpressure is controlled by sedimentation rate, lithologic variation, and eroded thickness. The modified Swarbrick’s Method can be used to predict top of fluid retention depth (top of overpressure), based on sedimentation rate data in the study area.