Regional Major Sequences Seismic Stratigraphic And Facies Units In Deepwater Depositional Setting Area, Nw Sabah Region

The deep-water of NW Sabah has always been an interesting area for study. This study involves 3D seismic reflection data covers area of shelf, slope and basin floor obtained from the PETRONAS. The results of the interpretation were summarized and presented with relation to depositional pattern of sediments. Seven seismic boundaries (SB) was determined and six seismic units (SU) were identified based on reflection amplitude, reflection continuity, reflection configuration and geometry. The seismic unit then were grouped based on their configuration into three seismic facies which are chaotic, wavy and parallel facies. Each of the facies shows different characteristics. Chaotic facies is characterized by discontinuous, low amplitude, low to medium frequency while wavy facies appears continuous/discontinuous, high amplitude and high frequency. Meanwhile the parallel facies is distinguished by its continuous, low amplitude and low frequency characteristics. Based on the interpretation, the chaotic facies is related to the MTC (sandstone) deposits, the wavy facies reflectivity determined the turbidite sandstone deposits and the parallel facies relates to hemipelagic or pelagic mudstone deposits.