CHARACTERIZATION OF THE PLEISTOCENE FLUVIAL SYSTEM IN SEPAT FIELD, MALAY BASIN USING SEISMIC ATTRIBUTES ANALYSIS

This study is focusing on the characterisation of Pleistocene to present day fluvial system found in Sepat Field in the offshore of Terengganu. It aims to characterise the fluvial system in Sepat Field and correlate the fluvial systems found in Sepat Field with the larger scale fluvial system of the Malay Basin. The methodological approach used for this subsurface study includes geological interpretation of 3-dimensional seismic data and wireline logs interpretation. Frequency spectral decomposition combined with variance and relative acoustic impedance attributes had provided a precise prediction on the dimensions, flow orientation and type of the fluvial systems in this field. This study shows that the fluvial system in this field is dominated by meandering channels that flow from northwest to southeast. Points bars, straight channels, channels boundaries and the evolution of the channels can be imaged and interpreted in this study through frequency spectral decomposition technique. A “hook” shape point bar stands out clearly in the data with depth up to 1.5km and is interpreted to be related to the Malay basin fluvial system. The fluvial system in Sepat Field is interpreted to deposit in the midstream river system and highly associated with the Chao Phraya-Johore River, with sediment sources come through this drainage basin and distributed to the tributaries fluvial channels including those in Sepat Field

Cenozoic tectonic evolution and succession of carbonate growth in development of Luconia-Balingian Provinces, Sarawak, Malaysia.

The Luconia and Balingian basins in Sarawak formed during the Eocene. The area underwent various tectonic deformations including extension and compressio

Shallow vs. Deep Subsurface Structures of Central Luconia Province, Offshore Malaysia Reveal by Aeromagnetic, Airborne Gravity and Seismic Data

International audienceAcross the Luconia continental shelf, the nature and structures of the crust are lacking geological understanding and precise characterization. Newly acquired, aeromagnetic, and airborne gravity data were used to assess deep and shallow sub-surface signals within the Central Luconia Province, off the coast of Sarawak, offshore Malaysia. Regional aeromagnetic anomalies appear to primarily reflect deep crustal features while depth (Z) tensors of airborne gravity anomalies evidence shallow subsurface structures. Strike directions of the interpreted structural trend on aeromagnetic and airborne gravity anomalies maps are measured and plotted into rose diagrams to distinguish the structural orientations for all datasets. Signature patterns extracted from the depth profiles were correlated with parallel seismic lines and nearest exploration wells and coincide well with the top of carbonate for Cycle IV/V and structures seen within the Cycle I and II sediments. The orientation of faults/lineaments at shallower depth is dominated by a NW-SE orientation, similar with the faults extracted from two recently published structural maps. Deeper subsurface sections yielded E-W to NWW-SEE dominant directions which were never presented in the published literature. The E-W oriented anomalies are postulated to represent the remnants of the accretion between the Luconia crustal block and southern boundary of the Palawan block. The NW-SE trend follows the same direction as prominent faults in the region. The insight into shallow and deep subsurface structures in Central Luconia Province imaged through airborne gravity and aeromagnetic data should provide guidelines and complementary information for regional structural studies for this area, particularly in combination with detailed seismic interpretation. Further evaluation on the response of Air-FTG® gravity and aeromagnetic could lead to the zonation of potential basement highs and hydrocarbon prospects in this area

Structural Restoration of Carbonate Platform in the Southern Part of Central Luconia, Malaysia

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The Role of Faulting on the Growth of a Carbonate Platform: Evidence from 3D Seismic Analysis and Section Restoration

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Evidence of Pre-Late Miocene Rifting by Seismic Reconstruction in Central Luconia Province, Sarawak

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IGCP 667 Project- Evolution of orogens through time and space: concepts from mapping visualization

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Temporal and spatial evolution of orogens: a guide for geological mapping

International audienceOrogens develop in convergent settings involving twoor more continental and/or oceanic plates. They are tra-ditionally defined as zones of crustal deformation associ-ated with mountain building resulting from either accretionof a terrane and/or an arc, continent-continent collision or rift-inversion. However, this definition does not considerthe genetic link between an oceanic domain and an intra-continental rift, even though extension associated with ascissor-shape opening can be demonstrated in many ocean-floored basins. Consequently, we propose a new conceptof orogenic evolution based on the development of exten-sional margins subsequently subjected to crustal shorten-ing. Thus orogens that develop as a result of the closureof wide basins, are distinguished from mountain belts devel-oped above subduction zones or that result from conti-nental collision and inverted intra-continental rifts. Ourreview of several key orogens identifies similarities anddifferences in geodynamic processes through geologicaltime including prior to the onset of plate tectonics ca. 2.5Ga. We propose that mapping based on comparative tec-tonics is a good way to constrain such an evolution, andthat this can start with a global-scale map of past-to-modernorogens aimed at re-exploring mountain building conceptsspatially and temporarily. This is the primary objective ofIGCP 667 project “World Map of Orogens”