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ABSTRACT: Reservoir characterisation through impedance modelling within a sequence stratigraphic framework: a case study from the Malay Basin

Marzuki, Zakaria1, Dave R Atkins2, and Mark S Sams3
(1) Petronas Carigali Sdn. Bhd, Kuala Lumpur, Malaysia 
(2) Jason Geosystems Asia, Jakarta, Indonesia 
(3) Jason Geosystems Asia, Singapore, Singapore

An impedance model was constructed for reservoir characterisation of a mature field in the Malay basin. The impedance model was built by merging the results of an inversion of a 3D seismic volume with a geological model derived from the extrapolation of well log data. The modelling required the integration of seismic data in the time domain with well log data measured in depth. A major obstacle that was overcome was the lack of checkshot data in most wells for depth to time conversion or sonic data for synthetic modelling required to tie the wells to seismic.

The solution was to carry out the data integration within a common framework. The framework used was a sequence stratigraphic model that was derived from and common to the input data. The sequence stratigraphic model evolved as more data were integrated and was continually checked against the input data. The sequence stratigraphic model was used to constrain the conditioning of the well log data including the generation of synthetic sonic data. The sequence stratigraphic model guided the data integration process and eventually provided a tool for the interpretation of the final impedance model and the prediction of lithology distribution.

The results of this integrated approach were interpretation of horizons not obvious on seismic data alone and imaging of the 3D geometry and continuity of reservoir bodies and fluid contacts within them.

AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia