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