As a broad brush exploration tool, the regional lithofacies of a rock unit can be mapped in a traditional stratigraphic display with a computer.

Digital sample log data is retrieved for a correlated interval and summarized to yield net feet of various rock types for each well. Rock-type ratios are calculated for a grid, and points are analyzed to determine where they fall on a conventional 100% triangle. A test is made of the isopach to define the limits of the stratigraphic unit. Colors are assigned based upon the subdivision of the triangle, and are calculated and plotted accordingly. Two triangle subdivision schemes are available.

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