American Oil and Gas Reporter - October 2016 - 62

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of the casing. The core of the bottom plug is an aluminum alloy
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ahead of the cement slurry and rupture at touchdown on the float
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The plugs were originally designed for the large diameter casing used on
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PRIVATELY OWNED -ESTABLISHED IN 1965
62 THE AMERICAN OIL & GAS REPORTER

Improved Trap Definition, Fault Seal
Figure 3 illustrates the multidisciplinary
approach adopted to build the simulation
model to address each of the key
challenges involved in field development.
Some of the key aspects of the work can
be summarized as building the container
(delineating trap and fault sealing), filling
the container (resolving stratigraphic
complexities), and filling the reservoir
(reducing uncertainties related to
compartmentalization and fluid contact).
As the flanks of Stampede Field's
four-way turtle structural trap subsided
in response to salt withdrawal, crestal
faults were created as a result of structural
"flexuring." The faults were both short
and long, with some long enough to offset
the base of the salt. To accurately estimate
in-place resources and understand field
compartmentalization, the structure's
shape had to be interpreted accurately
and every possible fault had to be mapped
correctly. In turn, structure shape and
fault maps depend on acquiring a good
seismic image.
Seismic image quality in subsalt
environments generally is impacted
adversely by the overlying salt geometry.
In Stampede, while the center of the field
was well-imaged, the flanks generally
were not because of steep salt flanks,
faulted base salt, intrasalt inclusions, etc.
Previous seismic images, including WAZ
data, were not clear enough to reliably
map the flanks of the structure and identify
small offset faults. Because of the lowfrequency content (about 12 hertz) of the
seismic data, the presence of subseismic
faults could not be ruled out.
Both NAZ and WAZ seismic data
were used in the exploration and appraisal
phases, which involved limited subsurface
illumination. As a result, while the central
part of the trap was imaged relatively
well, the peripheral part of the traps-
especially in the north and northwest-
were imaged poorly.
Dual-coil 3-D seismic data licensed
during the field development phase showed
an overall imaging improvement. We
used dual-coil seismic and its derivative
attributes to map the structural flanks


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Table of Contents for the Digital Edition of American Oil and Gas Reporter - October 2016

Contents
American Oil and Gas Reporter - October 2016 - Cover1
American Oil and Gas Reporter - October 2016 - Cover2
American Oil and Gas Reporter - October 2016 - Contents
American Oil and Gas Reporter - October 2016 - 4
American Oil and Gas Reporter - October 2016 - 5
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American Oil and Gas Reporter - October 2016 - Cover3
American Oil and Gas Reporter - October 2016 - Cover4
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