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Facies and Stratigraphic
Organization of the E-D-B Groups (Middle Miocene) Incised Valley Successions of
the Noring Field,
Abd Rahman, Abdul
Hadi1, Mohd Rapi
Mohamed Som2, Moh’D. Nurein
Bushara3
(1) Universiti Sains Malaysia, Penang, Malaysia (2) Petronas Research Malaysia,Bangi, Selangor, Malaysia (3) Petronas Carigali Sdn Bhd, Kuala Lumpur, Malaysia
The Noring field is located towards
the northeastern margin of the
Facies and stratigraphic
analysis of the sections identified a total of seventeen lithofacies
that are grouped into: i) a fluvial floodplain, and
ii) an estuarine/tidal flat facies-assemblage. The
floodplain facies-assemblage includes proximal over
bank lithofacies association (finegrained
levee deposits, crevasse-channel and crevasse-splay), lacustrine-floodplain
lithofacies association (laminated silt, shale and heterolithics) and back swamp lithofacies
association (coal and paleosols). These lithofacies defines part of the E Group. Stratigraphic interpretation of the E Group identified a
basal coal-bearing meandering fluvial and floodplain sub-interval, a middle
sand-prone braided fluvial sub-interval and an upper lacustrine
and meandering fluvial succession. The estuarine facies-assemblage
is restricted to the D Group, which overlies the floodplain facies.
This facies-assemblage is marked by the presence of Diplocraterion and Teichicnus
trace fossils within the mudstones and siltstones, and the absence of coal.
Thick, coarsening-upward deltaic successions of the B Group is represented by
a basal lowstand fluvial facies,
a transgressive prodelta
mud succession, and capped by a delta-front highstand
deposits.
The organization
of depositional facies and intervals of the E-D-B
Groups represent an incised-valley fill. The westward thickening of the
marine-influenced mud-dominated successions within the D and B groups
indicates the axis of the paleo-valley in the NNW seaward
direction.