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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Common Factors Among Atypical
Fields
By
Certain factors are functionally relevant to the occurrence
of typical as well as atypical oil and gas fields. Consideration of
such factors leads us to regard the distinction between typical
and atypical fields as a matter of degree. For purposes of
discussion, however, attention is focused on the more clearly
atypical fields.
In a study of the workings of oil and gas fields, it is quite
possible to reach the right conclusions for the wrong reasons.
In other words, we may observe an apparent relationship
between the presence of oil or gas and certain geological or
geochemical factors without determining the true causality of
that relationship (which could involve other vital factors
unperceived). Thus, our conclusions can be founded on mere
coincidence; and once reached, those conclusions may carry a
lot of conceptual momentum.
At this stage in our knowledge of petroleum origin we
probably stand to learn more from the "atypical" than from the
"typical." Why? Because some of our tacit assumptions are
challenged. The atypical situation forces us to answer new
questions. The new answers then may enable us to fine-tune
the search for more dependable oil and gas prospects-typical
or otherwise.
Some pertinent criteria of effective entrapment which can
be examined in both typical and atypical fields are: upward
reservoir convergence, stratigraphic shunting, structural
coherence, local cover weakness, near-vertical faulting,
differential compaction, deep-water discharge, minimum
potential energy, hydrothermal chimneys, and hydrochemical
plumes. End_Pages 2 and 3---------------