Eclipse Grid (*.dat)

This file defines a structured grid in the Eclipse ECLGRD format that may be irregular in the x and y directions.

The format of the file is:

1. Some header lines
2. A line beginning with the keyword SPECGRID to indicate the next line contains the grid size
3. A line containing the size of the grid nx, ny and nz cells
4. A blank line
5. A line containing the keyword COORD
6. 2*(nx+1)*(ny+1) giving the coordinates of the nodes on the top and bottom surfaces of the grid. The nodes generally start in the NW corner and cycle W to E and then N to S.
7. A line containing a / indicating the end of the COORD section
8. A blank line
9. A line containing the keyword ZCORN
10. Multiple lines containing the (nx+1)*ny+1)*(nz+1) z values of each node starting on the top in the NW, then cycling W to E, then N to S, and finally top to bottom.
11. A line containing a / indicating the end of the ZCORN section

For example:

--------------------------------------------------------------------------------

----- Eclipse Data File Generated From GOCAD SGrid Export

----- Name of Exported SGrid: Example_grid

--------------------------------------------------------------------------------

SPECGRID

40 40 28 1 F /

COORD

2.575490000e+005 1.859791000e+006 7.22694e+003

2.575500000e+005 1.859793000e+006 8.24271e+003

2.578000000e+005 1.859792000e+006 7.22709e+003

2.578010000e+005 1.859793000e+006 8.24256e+003

. . . .

/

ZCORN

7.22694e+003 7.22709e+003 7.22709e+003 7.22564e+003 7.22564e+003 7.22245e+003

7.22245e+003 7.21742e+003 7.21742e+003 7.21052e+003 7.21052e+003 7.20176e+003

. . . .

6.98399e+003 6.91652e+003

/

This grid is 40*40*28 cells.

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