3.4.8 Grids

The second large group of representations in the table is the grid group, which represents predominantly reservoirs. A gap analysis of current industry usage led to the design of six different grid representations:

• Three grid representations are fundamental, and although there has been a lack of data-transfer standards, they are of well-known types and include: IJK grid, unstructured column-layer grid, and unstructured cell grid.
• The other three are mixtures between the first three and consist of two truncated grid representations and a general purpose grid representation. The general purpose grid is notable because it is more of a grid description development toolkit than a specific grid type, and recognizes that unstructured grid usage is still evolving. Included are geometry-free grid representations, and both lower order and higher order finite element grids.

For more information about grids, see 11 Grids .