 |
 Why Does The Industry Prefer AGS PSDM?
It's Better, Faster, and Reasonably Priced!
- Superior Subsalt, Deep Shelf Imaging down to 15km.
- AVO friendly gathers.
- Best Steep Dip in the industry.
- Only Full 3-D Depth Demultiple tools in the industry.
- No aperture limitations.
- No decimation.
- No frequency limitations.
- Full 3-D Depth Tomography.
- 8-10 velocity/salt iterations at no additional cost.
- Fastest turnaround time in the industry.
Full
3-D Prestack Depth Migration
AGS's proprietary full 3-D prestack depth migration
algorithm is akin to the Beam method with some wave equations aspects.
It has been demonstrated in quantitative 2-D tests to be substantially
superior to the Kirchhoff method. In deep, high noise environments
such as near salt and subsalt prospects, our approach has substantial
advantages in both quality and turnaround
time over other methods such as the Kirchhoff, pure Gaussian Beam,
and fk wave equations methods.
Full 3-D Depth-Based Tomography
AGS's full 3-D depth-based tomography utilizes
residual moveout picked on depth gathers to determine updates in
slowness in a depth model on a regular grid. The conjugate gradient
method is employed to solve the derivative matrix, which is computed
from full 3-D ray tracing. The derivative matrix may be preconditioned
using one or more of several facilities that compensate for noisy
and missing data, such as suppression of low eigenvalues and discrimination
against solutions that have large spatial derivatives. AGS's velocity
extraction tool has shown itself to be stable, accurate and rapidly
converging.
| Advantages of AGS' Steered
Beam PrSDM |
| Feature |
AGS Steered Beam |
Finite Difference |
Kirchhoff |
| Steep Dips (>70°) and Overturns (Turning Waves) |
 |
|
|
| Unlimited Aperture |
|
* |
|
| Compensates for Acquisition Footprint |
|
|
|
| Avoids Operator Smiles |
|
|
|
| Implicit Anti-aliasing |
|
|
|
| Focus Discrimination |
|
|
|
| Multi-pathing |
|
|
|
| Velocity Estimation |
|
|
|
| Same Algorithm for Model Building and Final Volume |
|
|
|
| Turnaround for 2,000 Sq. Km. |
4 weeks |
Months |
Months |
| S/N Improvement - No Image in Non Reflecting Zones |
|
|
|
| Target Region |
|
|
|
| Implicit Anti-Noise |
|
|
|
| Propagation Path Localization |
|
|
|
* Common azimuth only |
|
