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2 D Modelling of Overpressure in the West Baram Delta, Sarawak

Mishan, Juhana (2008) 2 D Modelling of Overpressure in the West Baram Delta, Sarawak. Masters thesis, Universiti Teknologi Petronas.

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Abstract

This project is entitled 2D modeling of overpressure in the West Baram Delta, Sarawak, and the focus is on the basin study, reservoir fluid pressure, petroleum system and geophysical method. The main objective for this project is to reconstruct overpressure history in West Baram Delta area, with the aid of basin modelling. The study carried out in two phases. In the first phase, model reconstruction was based on disequilibrium compaction as the overpressuring mechanism. In the second phase, additional contribution to the development of overpressure from hydrocarbon generation was investigated. The methodology employed in this study include: seismic time to depth conversion, I D modelling, pore pressure estimation and 2D Basin modelling. Based on seismic interpretation, the tectonics in the Baram Delta is shown very active as where many growth faults can be seen. This high tectonism in Baram Delta leads to shale diapirism. From I D modelling the modeled basal heat flow range from 25 m W /m2 to 53 m W /m2 The comparison of top overpressure suggest that in Well H is shallower, located at the depth of 1000 m, while the top of overpressure in Well 0 is at 1800 m. The 2D models have been calibrated with the observed pressure, temperature and vitrinite reflectance datasets. The calibrated heat flow for the 2D modelling ranges from 35mW/m2 to 53mW/m2 . From the modeled overpressure in 2D basin modelling, the onset of overpressure is estimated to occur at 3050 m. In Well P, the top of overpressure was occurs at 3048 m, in Well A4 the depth occurs at 3100 m, Well 0 at 2987 m and Well Hat 2682 m. In the first model of2D basin modeling, the disequilibrium compaction indicates that overpressure starts approximately at 3050 m. In the second model, which includes the hydrocarbon generation, the depth of overpressure does not seem to vary much from the first model. It is therefore concluded that the main origin of overpressure in the West Baram Delta is disequilibrium compaction. Hydrocarbon generation does not contribute significantly to the development of overpressure in the Baram Delta.

Item Type: Thesis (Masters)
Academic Subject : Academic Department - Petroleum Geosciences - Petroleum Engineering - Reservoir characterization and well testing - Well test design and analysis
Subject: Q Science > QE Geology
Divisions: Geoscience and Petroleum Engineering
Depositing User: Users 2053 not found.
Date Deposited: 09 Oct 2013 11:07
Last Modified: 25 Jan 2017 09:45
URI: http://utpedia.utp.edu.my/id/eprint/8238

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