APPLICATION OF 4D WHEELER DIAGRAM FOR CONSISTENT STRATIGRAPHIC HORIZON FRAMEWORK IN DEEP WATER SABAH

Summary Typically, 2D horizons across calibrated well biostratigraphy data were done on regional lines to build consistent stratigraphic horizon framework. However, in Deep Water Sabah, the interplay of eustatic sea level change and tectonics are more complex. Each catastrophic events triggered old sediments transported further into basin and redeposited within younger sediment. This causing uncertainties to place ‘Last Appearance Datum (LAD)’ from biostratigraphic well data. At regional scales, calibration wells used are from different contractors where biostratigraphic data usually analysed and picked by different labs and contractors. These might lead to inconsistencies in some species identification especially microfossils preservation in a poorly recovered sequence. Thus made consistent stratigraphic horizon framework calibrated to well data in deep water is more challenging. In order to produce a consistent stratigraphie horizon framework in the Deep Water Sabah at basin and play scales, application of four dimension wheeler diagram (X,Y, Relative Geological Time and Thinning Attribute) was introduced.