About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 61 (1977)

Issue: 12. (December)

First Page: 2134

Last Page: 2142

Title: Oil and Gas in Reservoirs with Subnormal Pressures

Author(s): Parke A. Dickey (2), Wayne C. Cox (3)


Oil and gas are common in stratigraphic traps in structural basins, both deep down near the bottom, and also along the flanks. In many of these traps initial reservoir pressures were subnormal, indicating a lack of permeable connection to the outcrop. Some maps drawn on the potentiometric (piezometric) surface using pressure data from drill-stem tests show clearly the location of the stratigraphic barriers which have trapped the oil; these maps should be used in prospecting. Many giant gas fields with abnormally low initial reservoir pressures are low on the flanks of structural basins. The geologic factors favoring this type of accumulation are not understood.

The cause of the low pressures may be related to removal of overburden, which has resulted in a dilation of the pore volume in the rocks, and a decrease in reservoir temperature.

Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Protected Document: $10
Internal PDF Document: $14
Open PDF Document: $24

AAPG Member?

Please login with your Member username and password.

Members of AAPG receive access to the full AAPG Bulletin Archives as part of their membership. For more information, contact the AAPG Membership Department at [email protected].