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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Trap Analysis at Wilburton Field (Oklahoma) Better Defines Exploration Risks in the Arkoma Basin
By
Trap analysis has widespread application
for prospect evaluation of fault-bounded
structural closures in the Mid-Continent. Trap analysis involves
detailed study of how
the objective reservoir
section is juxtaposed with the sealing
section across a fault and can be used to
predict prospect viability and potential
hydrocarbon column heights for faulted
anticlines. This method was successfully
applied to lower Ordovician dolomite
objectives in faulted structures along the
Marathon-Ouachita Orogen.
The deeper pool Arbuckle discovery
by ARCO at Wilburton Field in late
1987 set off a drilling boom in the
Arkoma Basin. Before and after
Wilburton, many Arbuckle dry holes
were drilled which violated principles of
trap analysis. Many failed wildcats did not
have proper fault throw on the critical
trapping fault to juxtapose Arbuckle
reservoir section with down thrown (post
Simpson)
seal
section. Attributes of successful
prospects must include fault displacements
within a range controlled by
sealing stratigraphy. Trap risks can be
evaluated prior to drilling with a good
structure map and knowledge of local
stratigraphy and it's rock
properties
(including
capillary
entry pressures).
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