American Oil and Gas Reporter - August 2019 - 62

SpecialReport: Seismic & Geophysics
niques for implementing energy sources
in an almost simultaneous manner, which
is facilitated by the size of the survey.
Sometimes a survey is large enough that
multiple sets of energy sources can operate
almost simultaneously, he says.
Aerial Imaging
In onshore data acquisition, the single
biggest challenge to survey design is arguably not what lies beneath the surface,
but what is on top of it-be it in an urbanized area or a rural area with complex
terrain. Identifying topographical and geographical hazards on the ground is so
critical to acquisition success that Dawson
maintains a subsidiary, EagleEye Geospatial, to specifically address these issues
with aerial imaging services, Jumper says.
"The typical approach for well pad
planning is to pull up an image on Google
Earth, but in sparsely populated areas
those images could be more than two
years old," Jason Stockstill, general manager of EagleEye, points out. "As fast as
changes happen in areas like the Permian
Basin, the imagery needs to be much

more current."
In addition to up-to-date information,
aerial imaging provides very high resolution and accurate elevation information.
"We have the necessary resources, from
our UAV to manned aircraft platforms,
to capture details with an accuracy of
less than one foot," says Stockstill. "We
can map roads, fences, power lines and
other features and plan around them long
before boots ever hit the ground to help
improve the timing and efficiency of
Dawson's field crews.
"EagleEye utilizes these resources to
support the activity of our seismic crews
and to provide a means for improved efficiencies through the collection of accurate
imagery and the distribution of multiple
layers of geospatial analysis that has
proven to be useful to our clients within
the oil and gas industry," Stockstill adds.
Deepwater Gulf of Mexico
In the Mississippi Canyon area in the
Gulf of Mexico, CGG has acquired a
new high-density multiclient nodal survey
designed for high-quality imaging of the

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subsurface and improved definition of
subsalt structures.
"We are seeing that clients want increased density for enhanced resolution
of target reservoirs," says Matt Bognar,
CGG's senior vice president of multiclient
and new ventures for the Western Hemisphere. "The idea is to get a better image
from a better velocity model that leads to
a better interpretation with less uncertainty."
Innovative ocean-bottom node (OBN)
acquisition methods and CGG's unique
velocity modeling algorithms, powered
by high-performance supercomputers that
make it possible to quickly and efficiently
model huge datasets, are revolutionizing
subsalt imaging, Bognar claims. "Where
once the industry relied on interpretations
to estimate the subsurface, we are now
able to be increasingly data-driven and
rely more on the actual information in
the seismic dataset," he says. "This is
made possible by the high quality of the
seismic data, CGG's advanced imaging
technology, and the accuracy of the resulting velocity model."

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American Oil and Gas Reporter - August 2019

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