About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 64 (1980)

Issue: 5. (May)

First Page: 680

Last Page: 680

Title: Previous HitPermeabilityNext Hit of Clay and Shale: ABSTRACT

Author(s): John D. Bredehoeft

Article Type: Meeting abstract


Previous HitPermeabilityNext Hit is a critical factor in the maintenance of abnormal fluid pressures. The Previous HitpermeabilityNext Hit of "tight" geologic materials is difficult to measure, particularly in situ. Both the laboratory and in-situ methods require special techniques when the permeabilities are less than 10-10 cm/sec (10-7 darcys).

Previous HitPermeabilityNext Hit can be measured: (1) on rock samples in the laboratory; (2) in situ, using well-test procedures; and (3) on a regional scale, using a hydrodynamic analysis of the entire system.

Special techniques have been used to measure permeabilities in the Cretaceous Pierre Shale in South Dakota. Comparison indicates that the regional Previous HitpermeabilityNext Hit exceeds the local Previous HitpermeabilityNext Hit by two to three orders of magnitude. This suggests that secondary features, probably fractures, control the regional Previous HitpermeabilityTop.

End_of_Article - Last_Page 680------------

Copyright 1997 American Association of Petroleum Geologists