During diagenesis pore water and interlayer water of clay minerals are expelled in three stages as a result of both pressure and heat absorption. The migration of this water through the formation porosity alters the distribution of all mobile constituents including petroleum. The temperature dependent second stage of the dewatering process probably initiates petroleum migration into suitable traps, and geothermal gradient maps and clay dehydration contour maps may aid in determining areas and depths of petroleum traps.

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