|
New azimuthal binning for improved delineation of faults and fractures |
| ID |
17 |
| Title |
New azimuthal binning for improved delineation of faults and fractures |
| Authors |
Gabriel Perez and Kurt J. Marfurt |
| Authors detail |
CAGE-AGL, University of Houston, Houston, TX |
| Publication |
GEOPHYSICS |
| Publication Detail |
VOL. 73, NO. 1 JANUARY-FEBRUARY 2008; P. S7–S15, 12 FIGS. |
| Volume |
JANUARY-FEBRUARY 2008 |
| Year |
2008 |
| Abstract |
We suggest and test a new way to define azimuth binning in
Kirchhoff prestack migration. With this new definition, we
sort seismic data by the azimuth of the average travel path traversed
from the source to the subsurface image point and
back to the receiver, rather than the azimuth between source
and receiver on the surface of the earth. This approach avoids
mixing the typically weaker side-scattered energy with the
stronger in-plane reflections, thereby providing greater leverage
in identifying image contributions from out-of-the-plane
steeply dipping reflectors, fractures and faults. We examine
the impact of this new imaging approach combined with
analysis of seismic attributes that have proved useful for fracture
detection, on data from the Fort Worth Basin, Texas,
United States.We find that the image of features such as reflectors
and discontinuities focus into azimuths perpendicular
to the strike of each feature. The discrimination achieved
in the azimuthal domain allows for an increased resolution in
analysis of geologic features according to their strike direction.
It should also result in improved residual azimuthal velocity
analysis. |
| Keywords |
|
| Status |
Accepted |
|
