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Peninsular
Malaysia Region |
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There
are four basins in the Peninsular Malaysia region. The
Malay Basin and the Penyu Basin are located offshore to
the east of the peninsula . The other two basins, namely
the Central Sumatra Basin and the North Sumatra Basin
lie to the west of the peninsula and are mostly offshore
with a small portion lying onshore. The Malay Basin contains
about 12-km thick Neogene sediments that were deposited
within the non-marine to shallow marine environment. Reservoirs
consist of channel bodies, stack bar sands and braided
stream deposits. Significant oil and gas discoveries have
been made from all three reservoir types. Deep geo-pressure
play in the northern region promises to be the trend of
the future. In the Penyu Basin, oil has been discovered
on horst blocks of Oligocene synrift play consisting of
fluvial sandstones reservoirs. Other objective targets
are of Miocene post-rift play. Oligocene synrift play
also form the main play for the Straits of Melaka Basins |
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Sabah
Region |
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There
are three major basins in Sabah. The Sabah Basin, which
is located in NW Sabah, is mainly offshore while the other
two basins cover some areas in the N.E. and S.E. of onshore
Sabah. The Sabah Basin contains 12-km thick Neogene sediments
that were deposited within the deep marine and progradational
shelf slope environment. Reservoirs consist of channel
bodies, shallow marine clastics and deepwater turbidite.
Significant oil and gas discoveries have been made from
deepwater channel and fans and promise to be the trend
in the future. Although exploration activities have been
sparse in the Northeast Sabah Basin, minor oil and gas
discoveries have been found in the deltaic sandstones.
Other objective targets are deepwater fans and possibly
carbonate build-ups. The Southeast Sabah Basin objectives
intervals are of the fluviatile and estuarine sandstones. |
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Sarawak
Region |
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The
Sarawak Basin covers a wide area both onshore and offshore
in the State of Sarawak that has been divided into geological
provinces, namely the West Baram Delta, Balingian, Central
Luconia, Tinjar, Tatau, West Luconia and SW Luconia and
SW Sarawak Provinces. Exploration activities have been
more intensive in the West Baram Delta, Central Luconia
and Balingian Provinces, although the other provinces
have been explored to some extent and have fair share
of seismic acquisition and exploration drilling. Hydrocarbon
has been found in all provinces. The main drilling objectives
in Sarawak Basin, among others, range from the Oligocene-Miocene
coastal to nearshore sandstone in structural traps in
Balingian Province, Miocene reefal carbonate in Central
Luconia Province to Miocene Deltaic sandstones in Baram
Delta Province. The sedimentary succession on the Sarawak
Basin shelf is in excess of 12 km thick. Recently, renewed
interest in the prospectivity of the West Luconia Province
and the north portion of the Central Luconia Province
(including deepwater area) has seen a rise in exploration
activities. Except for the northern part, the onshore
Tinjar Province has seen relatively sparse exploration
activities. However, in view of the recent gravity/magnetics
survey and also the interpretation of SAR data in the
area, exploration works are set to increase. |
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Sedimentary
Basins in Malaysia |
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