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Direct measurements of porosities from Tertiary and Cretaceous shales in the Texas-Louisiana Gulf Coast show that in many areas shale porosity is either constant or increasing at the depths where high overpressures occur andwhere hydrocarbons are being generated. In the absence of a decrease in porosity with sediment load (depth), gasgeneration becomes the principal cause of overpressures and hydrocarbon expulsion.

Gulf Coast shale porosities decrease exponentially in normally compacting shales only down to porosities of about 30%, after which the decrease is linear until a constant porosity is reached. These linear trends are believedto be related to the high...

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