Abstract

Structural and sediment accumulation analysis of available seismic and 10 wells are performed to understand the Cenozoic basin evolution of the south western Malay basin. Structurally, the south western part consists of normal faults, horst and graben geometry. Tenggol fault is the boundary fault between the basinal side and Tenggol arch which penetrated through all Cenozoic sediments. Analysis shows that sediment accumulation rates are high towards basinal side which could be due to the normal faults movement. Rate analysis and 2D modeling explained that sediment accumulation initiated during 33.9 Ma towards the basinal side and could be associated to the activation of Tenggol fault. Sediments of 33.9-25.2 Ma were missing on the tenggol arch and may be arch acted as an erosional surface till 25.2 Ma. Analysis shows that from unit K (25.2-21 Ma) to unit A (6-0 Ma) sediments are found on both tenngol arch and basinal side with the consistent increase in thickness of sediment and accumulation rates towards basinal side. During the basin wide inversion, still sediments accumulated in considerable thickness in the south western part which may be due to less effect of inversion as compare to basin center. After the compression, sediments again deposited with mild tectonic activity or may be reactivation of faults.

Keywords:

Basin evolution, fault reactivation, inversion, sediment accumulation, structural analysis,

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