American Oil and Gas Reporter - September 2017 - 47
SpecialReport: Geophysics & Reservoir Evaluation
This suggests that these zones host higher
hydrocarbon saturation and may be more
susceptible to failure during hydraulic
stimulation. This interpretation can be
used to identify potential lateral well
targets through the Wolfcamp in the
study area.
Following the results of the petrophysical analysis, two samples hosting
varied porosity values were selected for
scanning electron microscopy (SEM)
analysis. The purpose was not only to
qualitatively validate the petrophysical
results, but also to evaluate the sample
matrix.
SEM imaging of the lower-porosity
sample, which also contained a slightly
higher TOC volume, highlighted disseminated organic matter, detrital grains of
less than 5 microns (µm) in diameter,
high clay content and minor intercrystalline
porosity within a dominant clay matrix.
The sample collected from the higherporosity zone revealed remarkably larger
detrital quartz grains (12-50 µm) hosting
minor overgrowths within a clay matrix.
Porosity was observed as both intercrystalline and intracrystalline, with the latter
occurring within an amorphous silica
phase that has enhanced the pore system.
enhance the imaging of these channels
first required creating a formation volume
to highlight the Wolfcamp B section. From
this formation volume, a dip volume and a
coherency volume then were derived, after
which the coherency volume was flattened
on to the Wolfcamp B to create a stratal
visualization. This process allowed for the
highlighting of the probable channel bodies
in both the northern and southern 3-D surveys, as shown in Figures 6A and 6B.
The seismic area in Figure 6A is approximately 40,000 by 30,000 feet in
part of the southern area, with the Glass-
FIGURE 6A
Stratal Slice of Southern Survey
3-D Seismic Interpretation
The two 3-D seismic volumes were
utilized for advanced reconstruction and
interpretation to identify potential reservoir
targets. The entire Wolfcamp B (including
the Middle Wolfcamp B) was used for
this process because of its positive petrophysical evaluation. The 3-D seismic volumes were conditioned first before applying any processing or interpretation.
Following the definition of the formation's
top and base, advanced 3-D visualization
software was utilized to remove currentday subsurface structure to effectively
flatten the Wolfcamp B and visualize any
sedimentary features/geometries.
Further processing of the 3-D seismic
revealed an east-to-west migration trend
of probable channel geometries throughout
the Wolfcamp B section. The process to
FIGURE 6B
Stratal Slice of Northern Survey
SEPTEMBER 2017 47
American Oil and Gas Reporter - September 2017
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