http://www.glossary.oilfield.slb.com/Display.cfm?Term=isopach
A isopach map is a type of isoline map that uses continuous lines to represent the true thickness of rock layers in a specific geographic area. The true thickness takes into account the lay of the land and is the actual thickness of each layer without taking into account geographic features. The isopach map above represents a oil reservoir site with the red dashed lines representing the isopachs, as you can see they don't necessarily mimic the contour lines, but they are in close correlation.
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