Completed
Study
Shear
Wave Seismic Study: Comparing 9C3D SV and SH Images with 3C3D
C-Wave Images
(A study funded by the U.S. Department of Energy and Vecta
Exploration)
|
c_250.jpg)
Click
on image to enlarge. |
|
In
a simple homogeneous Earth, three shear-wave (S-wave) images
can be made from 9C3D seismic data. One image can be made from
the SV mode, a second image can be made from the SH mode, and
a third called the C-wave can be made from the "converted"
SV mode created by P-to-SV mode conversion at subsurface interfaces.
Only one S-wave image can be created from 3C3D data, that being
a C-wave image. Independents who are interested in S-wave seismic
technology need to be informed about the differences, similarities,
advantages, and disadvantages of these three S-wave imaging
options. |
|
|
The objective
of this study is to create all three S-wave data volumes (SV, SH,
C) across the same prospect(s) and to document the relative merits
of each S-wave seismic mode. This
research does not require field work. The
9C3D and 3C3D seismic data needed for the investigation already
reside at the Exploration Geophysics Laboratory (EGL), a research
unit of The University of Texas at Austin. EGL will be subcontracted
by Vecta Technology (Vecta) to do critical parts of the data processing
and analysis. The objective is to use common-midpoint (CMP) algorithms
to create SV and SH images from 9C3D data and then use common-conversion-point
(CCP) algorithms to produce C-wave images from 3C3D data. Comparison
of these images will be done to determine advantages and disadvantages
of each S-wave imaging technique. Vecta will drill a new well inside
the study area and acquire a dipole sonic log and other modern logs
in this well as their cost-sharing obligation to DOE.
|
| |
|
|
|
February
2003
|
|
c_600.jpg)