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ASSESSMENT OF A SYNRIFT PLAY IN SOUTH DENT GRABEN (OFFSHORE EASTSABAH)

MANSOR, HARMINZAR (2008) ASSESSMENT OF A SYNRIFT PLAY IN SOUTH DENT GRABEN (OFFSHORE EASTSABAH). Masters thesis, Universiti Teknologi Petronas.

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Abstract

South Dent Graben is located offshore of East Sa bah at the south part of the Sandakan Sub basin. This basin is a very lightly explored area. There is only one exploration well drilled here. The stratigraphy of this basin mainly divided into two parts: synrift sediments and post rift sediments. They are separated by the breakup unconformity that represents the Middle Miocene Unconformity (MMU). Post rift sediment consists of the Sebahat Formation, the Ganduman Formation and the Togopi Formation. The interpretations and petroleum play analysis of the post rift sediments have been done in 2005. Basically this project is a continuation from the 2005 project but focused more on the synrift sediments. Synrift sediments are represented by Segama Group (Libung and Tungku Formation), deposited during Early- Middle Miocene. Five horizons have been interpreted: Top Basement, Base Purple, Base Brown, Base Green and Middle Miocene Unconformity. From the seismic interpretation and mapping that has been done, no economic size structural trap or stratigraphic play appears in the synrift sediments. Synrift sediments only present in a small part of the basin and later overlain by extensive postrift sediments through out the whole basin. Even though the north part of the basin has hydrocarbon occurrences in the synrift sediments (Tanjong Formation/Segama Group), the reservoir appears more equivalent to the Tanjong Formation. High proportion of volcaniclastic sediments and conglomerates is the reason that the Segama Group is not a good reservoir. Besides that, a calculation from the Vrms also shows very high interval velocity ranging from 3000ms'1 to more than 4000ms'1 , suggesting that the sediment is compacted, has a low porosity and may not be a good reservoir. VI

Item Type: Thesis (Masters)
Academic Subject : Academic Department - Petroleum Geosciences - Petroleum Engineering - Reservoir Engineering - Reservoir fluid properties
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/8278

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