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• Main Author: SUSENO (NIM 22710302) pembimbing : Prof. Ir. Lambok M. Hutasoit, PhD : Agus M. Ramdhan, ST, M, WELING
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/17541
• Institution: Institut Teknologi Bandung

This research discusses about the cause of overpressure in Langkat, North Sumatera Basin. The understanding of the cause of ovepressure is a very important element in <br /> <br /> <br /> <br /> <br /> determining the success to predict overpressure in oil and gas drilling activity. The methods used in this research are based on wireline log data analysis which consists of <br /> <br /> <br /> <br /> <br /> gamma ray log, sonic log, density log, and neutron log together with cross-plot analysis between the parameters of the wireline logs. Results of the analysis show that the ovepressure in the research area is caused by unloading mechanism as a result of clay mineral diagenesis. This process transformed smectite to illite and illite to kaolinite due to temperature which reached the ideal <br /> <br /> <br /> <br /> <br /> condition to transformed the minerals. The process produced fluid as a result of the reaction. The overpressure in the research area occurs at depths beginning from 4,000 ft, except at Besitang-1 well, where it begins to occur at the depth of 1,413 ft. It is distributed in Baong Formation, which is dominated by clay which has low permeability.