Print this pagePARASCHIVOIU, EVELINA, University of Adelaide, National Centre for Petroleum Geology and Geophysics, Adelaide, South Australia
ABSTRACT: The Use of 
Forward
Stratigraphic Modelling for Reservoir Characterisation
The project investigates the possibility of using forward
stratigraphic modelling (specifically Sedsim) to build a reservoir model for an oil field
which exhibits stratigraphically controlled lateral and vertical facies variations. The
Stag Field (Dampier Sub-basin, Northwest Shelf of Australia) has been chosen as a case
study for simulating a shallow marine siliciclastic reservoir.
The Sedsim computer package can simulate 3D distribution of uncompacted sediments of
four different grain sizes on a bathymetric surface, by modelling forward in time sediment
transport, deposition and erosion. Different factors influencing sedimentation, as well as
different scenarios of depositional evolution can be assessed to better understand the
causes of significant rock heterogeneity.
The first stage of this study consists of running a depositional simulation over an
80x50 km area on the Enderby Terrace, surrounding the Stag field, for a time interval of
10 million years in the Early Cretaceous. The palaeoreconstruction is based on 2D and 3D
seismic and well data from around 20 exploration wells. Once the overall grain size
distribution in this regional model is achievedand thus the main depositional controls
identifieda more detailed model will be built for the Stag field (approximately 10x15km),
simulating the deposition of the sands included in the M. australis palynozone. The
reservoir scale model will predict and quantify facies variations and stratal architecture
for the inter-well space, below the seismic resolution. The Sedsim model will form the
base for a reservoir simulation model, which in turn will be history matched with
production data
.
AAPG Search and Discovery Article #90909©2000 AAPG Foundation Grants-in-Aid