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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
Chapter from:
(Publication Subject:
Chapter 5
Seal Strength vs. Trap Closure--A Fundamental Control on the Distribution of Oil and Gas
by
John K. Sales1
Mobil Oil Corporation (retired), U.S.A.
1Currently at RR-1,
Box 197, Cabot, Vermont, 05647
ABSTRACT
To the extent that the best provinces are exposed to an excess of both fluids, this principle controls world distribution of oil and gas. More practically, in an economy-favoring oil, higher-class traps leak gas, preserving oil in themselves and traps updip. The trap class of a discovery has implications that may modify drilling sequence.
During uplift, class 1 traps may be gas-flushed and thus degrade. Class 3 traps should change minimally. Class 2 traps should vent additional, now more buoyant gas, and make more space for oil, improving their economics. A slightly different scenario applies if seal strength decreases during uplift.
In the North Sea, Gullfaks, Snorre, and most of the Ekofisk group of chalk anticlines are class 3, Oseberg is class 2, and Troll East, is class 1. Turner Valley in Alberta, which has a two-phase fill, perpetual gas flare, great closure, and
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