Velocity Model Building
The key to an accurate image
Velocity model building presents one of the most daunting
challenges in exploration geophysics today. Geotrace has developed
a unique and ingenious suite of technologies, including leading-edge
Multi-Scale Tomography (MuST) capable of producing high- resolution,
stable velocity models. We also have all the necessary software
tools to update, edit and manipulate complex 3D velocity models,
including top and base salt.
Depth and Interval Velocity Analysis (DIVA)
Geotrace has developed DIVA, another one of our proprietary
technologies, to provide the industry’s most proficient
velocity model building tool, as well as to help identify depth
error picks and update depth velocity models.
DIVA
provides the front-end graphical user interface to our Multi-Scale
Tomographic Inversion (MuST) algorithm.
Case
Study: Depth-Velocity Model Building Using Multi-Scale Tomography
- Part 1
Multi-Scale Tomography (MuST)
Multi-Scale Tomography (MuST) is a velocity
updating methodology that uses a multi-grid representation of
the earth. The velocity model is described as the superposition
of several grids of different sizes, representing different dominant
scales in the earth. No longer are you restricted to “single
cell size ” models. The result is a stable, high-resolution
velocity model, with special considerations having been taken
to account for the full azimuthal coverage necessary for land
and wide-azimuth processing.
Our MuST technique
takes the depth errors extracted from the common image gathers
generated during the pre-stack depth migration and inverts—simultaneously
for all scales—for a better velocity model.
Case
Study: Depth-Velocity Model Building Using Multi-Scale Tomography
- Part 2
Technology High Grades Tomography (American Oil & Gas Reporter, July 2007)
Tomographic Velocity Inversion (Journal of Petroleum Technology, April 2007)
 Multiscale Simultaneous Tomography (MuST)
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