An isopach map is a contour map showing the thickness of a given "stratigraphic unit." A stratigraphic unit is a rock layer, or series of rock layers, that geologists have recognized as extending across a given area. Isopach maps can help you understand how a rock layer formed, what its structure is like, and other features such as the size and extent of ore deposits, oil fields, and the like.

A map showing vertical thickness of beds. isopach and isochore maps are same only in case of horizontal beds............Arijit

Helps in obtaining the total estimate of hydrocarbons in the pay zone.

isopach lines are contour lines that connect areas of equal ground thickness.

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