An isopach map is a map that contains many isopachs. Isopachs are contour lines of equal thickness over an area, and, put together, they show the variation of thickness within a tabular unit or stratum. Isopach maps are used for stratigraphy, sedimentology, structural/petroleum geology, and volcanology.
This isopach map depicts isopachs of a reservoir, with contours shown in red dashes (source: Venezuela Well Evaluation Conference, 1997).
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