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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 17 (1967), Pages 135-142

Relationship of Mineral Composition of Shales to Density

R. W. Rochon

ABSTRACT

A relationship has been found between the bulk density of shale, electrical measurements of the induction, sonic and density curves and overpressured zones in the Miocene Section of Louisiana.

The phenomenon which causes high pressures is relative to periods of fast deposition when hydraulic equilibrium of interstitial waters accompanying normal compaction is disturbed by a restriction to the orderly expulsion of water from the shales.

Investigations indicate changes in depositional environment cause a differential in the rate of loss of water from shale which in turn is related to overpressuring of formations.


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