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Abstract: Application of High-Resolution Depositional Modeling to Reservoir Characterisation

Keyu Liu, Lincoln Paterson

As hydrocarbon producing basins and fields become more intensely developed, conventional stratigraphic analysis methods can sometimes no longer meet the resolution required by petroleum geologists and engineers. High-resolution depositional modeling provides a quantitative alternative to the conventional approach of sequence stratigraphic analysis. A computer program, SEDPAK, which was designed primarily according to the basic premise of the sequence stratigraphic concept, was here used to conduct high-resolution simulations for two sedimentary sequences. One is a Pliocene to Recent shelf margin sediment sequence of the offshore Sydney basin continental shelf, Australia; the other is the Early Cretaceous (Aptian) Windalia Sand reservoir of the Barrow Island Field, North W st Shelf, Australia. In both instances, the simulations have well mimicked the variations of the sedimentary facies temporally and spatially in fine detail with each time step representing 10 ka and a vertical resolution of one meter.

The reservoir heterogeneities and the observed cyclicity in the Windalia Sand were particularly well documented by the SEDPAK simulation using a locally derived sealevel curve. The simulation result suggested that high-frequency sealevel variations associated with Milankovitch cyclicity were probably the primary cause that controlled the reservoir heterogeneities of the Windalia Sand. This finding provides a working model for the Cretaceous coeval reservoirs in the North West shelf, Australia.

AAPG Search and Discovery Article #90956©1995 AAPG International Convention and Exposition Meeting, Nice, France