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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
Volume:
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Title: Migration
and Entrapment Within Faulted Structures
Author(s):
Abstract:
A model is presented that relates faults to migration
and entrapment. The basic assumption of the model is that a fault is neither a seal nor a conduit. Therefore, the effect of faulting on both
migration
and entrapment depends on the rock properties of strata juxtaposed by the fault and on the structural attitude of the juxtaposed fault blocks. Fault-plane sections used with structure maps give a three-dimensional view of
migration
and trapping, and they illustrate the interplay of three critical parameters: (1) closure style, i.e., unfaulted anticline, faulted anticline, or nose, (2) cross-fault geometry, i.e., the throw and change of throw along a fault, and (3) stratigraphic geometry, i.e., the thickness and spacing of permeable and impermeable units. Cross-fault spil
points define limits of trapping potential and paths for vertical
migration
. Synclinal spillpoints define stratigraphic tops of vertical
migration
paths and egress points for lateral
migration
. The validity and importance of the basic assumptions of the model can be evaluated by comparison with oil field characteristics in specific provinces.
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