Rock/Soil Zonation Description (EOR-BO)

The zonation or distribution of rock/soil types across the computational domain is declared via the Rock/Soil Zonation Card. Three options are available through this card for declaring the distribution of rock/soil types:

1. Explicit declaration
2. External files
3. IJK Indexing

Explicit declaration is a good choice for simulations involving a limited number of rock/soil types. Under this option the user associates rock/soil type names with portions of the computational domain. Rock/soil names must be unique and contain no more than 64 characters. The following key words have special meanings when used within a rock/soil name:

• skip conv is used to skip convergence checks on nodes with associated rock/soil types
• dp, dual porosity, or fractured in the rock/soil name indicate a dual porosity medium, which triggers the reading of both matrix and fracture properties

When explicitly declaring the rock/soil zonations, rock/soil names can be repeatedly applied to a grid cells or domain of grid cells, with only the last definition being applied.

External files can be useful when the rock/soil zonation data are automatically generated (e.g., geologic visualization programs).

IJK Indexing should be used when every grid cell is associated with a unique rock/soil type, as common with statistically generated rock/soil distributions. With IJK Indexing the concept of rock/soil types is abandoned for a system where the intrinsic properties of the geologic media are associated with the grid cell. The rock/soil type of a grid cell is extended to boundary surfaces adjacent to the grid cell (i.e., intrinsic properties of the geologic media on boundary surfaces are those of the rock/soil type property or IJK Indexing property descriptions for the node adjacent to the boundary surface).