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.

[thumbnail of 2008 Master - Assessment of a Synrift Play in South Dent Graben (Offshore East Sabah).pdf] PDF
2008 Master - Assessment of a Synrift Play in South Dent Graben (Offshore East Sabah).pdf

Download (7MB)

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)
Subjects: Q Science > QE Geology
Departments / MOR / COE: Geoscience and Petroleum Engineering
Depositing User: Users 2053 not found.
Date Deposited: 09 Oct 2013 11:07
Last Modified: 15 May 2023 03:55
URI: http://utpedia.utp.edu.my/id/eprint/8278

Actions (login required)

View Item
View Item