13.7 Seismic Survey Representations on a Grid

There is a reservoir modeling practice in which an IJK grid used for geologic modeling or flow simulation is aligned with the inline/crossline lattice of a seismic survey. There are two natural ways to express this relationship in RESQML, both using subrepresentations.

• If the intent is to align the lattice with the edges of the cells, then the indexable element kind is “pillars” and the NIL x NJL indexing would correspond to inline and crossline, respectively.

• Similarly, if the intent is to align the lattice with the cells themselves, then the indexable element kind is “columns” and the NI x NJ indexing corresponds to inline and crossline, respectively.

The explicit choice of indexable element in the subrepresentation removes the ambiguity in alignment (column or pillars) that often makes this workflow confusing.