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The AAPG/Datapages Combined Publications Database

Journal of Petroleum Geology

Abstract

Journal of Petroleum Geology, Vol.5, No.4, pp.417-426, 1983

┬ęCopyright 2000 Scientific Press, Ltd.

PHYSICAL CONSTRAINTS OF FAULTlNG IN A GEOPRESSURED
SEDIMENTARY BASIN*

Kinji Magara+

* Published by permission of the Director, Bureau of Economic Geology.

+ Bureau of Economic Geology, The University of Texas at Austin, Austin, Texas 78712.


Abstract

On the basis of the triaxial stress concept, the tectonic stress required for Previous HitfaultingNext Hit and sliding in a sedimentary basin can be estimated. The horizontal tectonic stress necessary for thrust Previous HitfaultingNext Hit, for example, increases with depth from the surface to about 9,000ft (2.7 km), and decreases below 9,000ft (2.7 km), primarily because of a changing Poisson's ratio. Changing the vertical effective stress caused by generation of abnormal fluid pressure would also change the tectonic stress requirements for Previous HitfaultingTop.

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