Overpressure's top and generating mechanism in "aPR" block, North Sumatra offshore area

Pradana, A. and Setyowiyoto, J. and Prasetyo, B. and Haidar, W. (2021) Overpressure's top and generating mechanism in "aPR" block, North Sumatra offshore area. In: International Conference on Geological Engineering and Geosciences, 16-18 March 2021, Yogyakarta.

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Abstract

The offshore North Sumatra Basin is one of the hydrocarbon-prone basins in Indonesia. The Malacca Formation acts as the reservoir in this basin. However, there are some drilling problems caused by abnormal pore pressures. Overpressure analysis is carried out so that drilling activities are avoided from drilling problems such as kicks, blowouts, stuck pipes, loss circulation, and collapse. This study aims to analyze the overpressure in the "APR"block, offshore North Sumatra Basin, which includes determine the depth of the top overpressure and the mechanism of overpressure formation. In the research area, analysis of 3 exploration wells was carried out. Overpressure is analyzed based on well log data, and pressure test data using the Eaton method (1975) supported by other data such as LOT (Leak-Off Test) data, drilling reports, mudlogs. At Well A, top overpressure depth is 3235 ft TVDSS (true vertical depth sub sea). At Well P, top overpressure depth is 3065 ft TVDSS, and at Well R, top overpressure depth is 2901 ft TVDML (true vertical depth mud line). The overpressure generating mechanism in the study area is caused by the loading mechanism (disequilibrium compaction) and caused by the nonloading mechanism (hydrocarbon buoyancy). © Published under licence by IOP Publishing Ltd.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Cited by: 0; All Open Access, Gold Open Access
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Faculty of Engineering > Geological Engineering Department
Depositing User: Sri JUNANDI
Date Deposited: 04 Oct 2024 06:57
Last Modified: 04 Oct 2024 06:57
URI: https://ir.lib.ugm.ac.id/id/eprint/3962

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