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Abstract
Chapter from:
AAPG Memoir 67: Seals, Traps, and the Petroleum System, Edited
by R. C. Surdam
(Publication Subject: Oil Methodology, Concepts)
AAPG Memoir 67: Seals, Traps, and the Petroleum System. Chapter 4: Delineation of a Pressure Fault Seal From Shale Resistivities, by James C. Niemann and Mark R. Krolow, p. 49-55
Copyright © 1997 by The American Association of Petroleum Geologists. All rights
reserved.
Chapter 4
Delineation of a Pressure Fault Seal From Shale
Resistivities
by
James C. Niemann and Mark R. Krolow
Chevron USA Production Co. New Orleans, Louisiana, U.S.A.
ABSTRACT
Pressure differentials between fault blocks are definitive
evidence of a fluid seal across faults. A method is proposed for using log-derived and
calculated pressure 
gradient
values to correlate and map pressures on cross sections to
delineate pressure differentials across fault zones. These values were calculated and
mapped along a known hydrocarbon sealing fault inferred to be a pressure seal in a field
from the Gulf of Mexico. The results indicate that this method can generate a detailed
picture of the fluid and pressure history to aid in the documentation and prediction of
sealing or leaking relationships along fault zones.
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