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Results
Image-stacking After Horizon Analysis
Apel, W. (RWE-DEA) | Schneider, J. (Bureau of applied geophysics)
INTRODUCTION Summery A stacking method is proposed in which stacking of the seismic data is incorporated into the Kirchhoff migration process with stacking velocities determined by the application of horizon analyses to individual segments. Application to both synthetic and measured data show that interfering reflections in the stacked section can be corrected independently of each other. The signal to noise is improved. In the processing applications encountered so far numerical artifacts were tolerable. Velocity analysis in conventional processing of seismic data is performed within time window for selected cdp-locations. At a given location and a specified time the stacking velocity can only be determined for one seismic event.
- Geophysics > Seismic Surveying > Seismic Processing > Seismic Migration (0.73)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling (0.73)
Summary It is shown how a sequence of processing steps, including time migration before stack can be simulated to treat an observed event provided its travel time and time derivative are known. These computations can be included into model calculations to estimate important processing parameters or may be used to simulate timemigration for events picked in the stacked section. Introduction In the last two decades the process of time migration before stack (MBS) has been largely substituted by depth migration since the latter scheme is known to render more accurate solutions for verified depth models. Nevertheless, time MBS is still used at an earlier stage of the processing when reliable depth models are not avail- able or for velocity analyses when interfering reflections are to be unfolded.