Corner-Point Geometry for the Johansen Formation
Each (linear) pillar is defined by two distinct points on it, which is specified by two triplets of x-, y- and z-coordinates. There are (nx + 1) x (ny + 1) pillars in the grid, which gives a total of 6 x (nx + 1) x (ny + 1) double values in the data file. The unit is metres.
The depths of the corner points of each cell are specified with 2nx x 2ny x 2nz values. First the two corners in the i-direction of the first grid cell is given, then the two corner of the next grid block in the i-direction etc. The unit of the values is metres, and the depth values are positive with increasing values downwards.
Some of the cells in the corner point grid are not included in the simulation. The active cells have the value 1 while the inactive cells have the value 0.
The corner point format assumes that grid cell corners are distributed along vertical, linear pillars. All grid cells have 8 corners, but these may not be geometrically distinct due to grid pinch-outs. Since the grids are allowed to contain vertical faults, all the eight corners are provided for each grid block.
The grid blocks are ordered with the x-axis index (i-direction) cycling fastest, then the y- and z-axis indices (j- and k-direction). The grid contains nx x ny x nz grid cells. All cell-wise property data follows this numbering scheme.