Coordinate line based corner point grids have been used for petroleum reservoir simulation with a high degree of success. A coordinate line is a vertical or a near vertical line on which nodes of grid cells exist. Their application to unstructured grids has also been presented. Previous work is based on straight coordinate lines (within a single reservoir), whereas this paper presents an algorithm for creating coordinate lines with multiple straight line segments, as well as their application to unstructured grids. This approach is particularly powerful for handling complex fault structures such as slump faults and Y faults.


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