American Oil and Gas Reporter - October 2016 - 63

more accurately and to delineate small
offset faults that could be flowbaffles/barriers causing possible
compartmentalization.
Figure 4 shows the current depth structure map of the Gff40s main reservoir
zone using dual-coil seismic data. Compared with the legacy structure map in
Figure 1, it shows new faults mapped on
the northwest and central sections of the
field. Discovery and appraisal well location
and trajectories also are shown.
The ability of a fault to be a seal or
flow barrier depends on various factors,
including its extent, offset, lithology, and
the nature of juxtaposition. Although
several faults were mapped with dual-

coil seismic, it also was necessary to
perform a numerical modeling test to
determine their ability to seal. Accordingly,
3-D multifault seal analysis was conducted
for this purpose.
Structural maps, faults, and the
geological model with lithology derived
from drilled wells and extrapolated across
the fields were input into the seal analysis.
Fault properties such as throw distribution,
shale gouge ratio (SGR), fault zone
thickness, and fault zone permeability
were calculated and analyzed.
The analysis indicated that faults with
large local throws resulted in a low
frequency of sand versus sand windows,
faults with small local throws had minimal

FIGURE 5
Shale Gouge Ratio (Left) and Fault Transmissibility Multipliers (Right)
For Fault Shown in Red in Inset Map (Bottom Center)

FIGURE 6
Facies Population Approach for Gff40s Reservoir Zone
EOD Map

Lobes Elements

User-Deﬁned Object

Training Image
Facies
Population

OCTOBER 2016 63

American Oil and Gas Reporter - October 2016

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
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