Abstract: A method includes setting a target value for a coordinate direction of a depositional space to define a cutting plane that cuts a depogrid cell at the target value in the coordinate direction. The method further includes generating a cutting polygon that bounds a planar region of the cutting plane to define a cutting surface at the target value that subdivides the depogrid cell into a plurality of depogrid cells in the coordinate direction. The cutting surface provides common planar surfaces between the plurality of depogrid cells in the depositional space. The method further includes transforming the cutting surface to a geological space using vertices of the cutting polygon and a correspondence mapping that defines a relationship between depositional coordinates and geological coordinates. The cutting surface provides common non-planar surfaces between the plurality of depogrid cells in the geological space.