Geometry and Refraction Statics
Geometry
Geometry definition is fundamental to the success of every seismic
processing project. Geotrace performs exhaustive quality-control
procedures every step of the way.
At the onset of a project, we examine all imported survey information
for completeness. Based on the “recording patch”
definitions provided with the field data, we assign source and
receiver station location coordinates to the seismic traces for
each source record in the survey. We meticulously verify the actual
x, y, z locations—particularly source locations—to avoid
any of the discrepancies that often occur due to cultural obstacles
in the field.
Errors
must be identified and corrected or virtually all subsequent processing
will suffer. To that end, Geotrace experts identify and edit excessively
noisy or bad traces.
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First
Break Picking and Refraction Statics
Statics are always an issue, and they often pose a huge challenge
for land datasets. First break picking and refraction analysis,
the integral first steps to virtually all onshore seismic processing
projects, help determine appropriate statics solutions that will
influence all subsequent processing stages. First breaks are also
valuable for geometry quality control and correction of misplaced
source or receiver stations.
Geotrace uses proprietary as well as industry-leading third-party
software for first break conditioning and picking. Once the critical
step is completed, refraction analysis may proceed. This is truly
a near surface modeling exercise, and the answer is in the breaks.
Geotrace employs both Hampson-Russell GLI3D and Renegade Seismic
Studio software packages for generalized linear inversion and
delay-time refraction solutions, respectively. Challenging datasets
often require empirical model perturbations in both approaches
to arrive at the optimal solution.
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