Abstract - In object- or pixel-based modelling, facies connectivity is tied to facies
proportion as an inevitable consequence of the modelling process. However, natural
geological systems (and rule-based models) have a wider range of connectivity
behaviour and therefore are ill-served by simple modellingmethods in which connectivity
is an unconstrained output property rather than a user-defined input property.
The compression-based modelling method decouples facies proportions from facies
connectivity in the modelling process and allows models to be generated in which
both are defined independently. The two-step method exploits the link between the
connectivity and net:gross ratio of the conventional (pixel- or object-based) method
applied. In Step 1 a model with the correct connectivity but incorrect facies proportions
is generated. Step 2 applies a geometrical transform which scales the model
to the correct facies proportions while maintaining the connectivity of the original
model. The method is described and illustrated using examples representative of a
poorly connected deep-water depositional system and a well-connected fluid-driven
vein system.
In: Avalos Sotomayor, S.A., Ortiz, J.M., Srivastava, R.M. (eds) Geostatistics Toronto 2021. GEOSTATS 2021. Springer Proceedings in Earth and Environmental Sciences . Springer, Cham. 111-117, doi: https://doi.org/10.1007/978-3-031-19845-8_8, 2023.