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Collaborating Authors
1988 SEG Annual Meeting
All of these Automatic detection of seismic breaks in slope are extremely localized in reflection onset times through analysis of time, i.e., they are generally, one sample instantaneous phase discontinuities allows wide. In typical instantaneous phase a variety of important interpretative and color section displays, this break in processing functions to be performed.
Instead of minimizing the mismatch between the picked events and the Low-wavenumber components of the velocity function events predicted by the velocity model, I maximize the can be tomographically estimated from bean-stacked beam-stacks energy at the traveltimes and surface locai data in presence of structure in the geology and lateral tions predicted by the velocity model.
The A special case of the Radon transform known as a slant stack or Tau-p transform is used in a variety of geophysical waveform in the (z, 1) space here naturally does not form data analysis procedures. Filtering and wavefield a simple point, but the principle is the same. Note that separation are typical examples. An alternative method for the strength of the radial lines is a function of the spatial sampling. Thus, finer spatial sampling diminishes the amplitude the inversion of slant stacks in the two-dimensional Fourier of the fanned lines. However, the truncation effects domain is presented. The main feature of this technique is are not removed by finer spatial sampling. Essentially, the the extraction of hyperbolae from the transformed space of slant stack of a line defined by discrete, finite-length data ray parameter versus frequency to reconstruct columns of produces a point plus some artifacts.
II. KNOWLEDGE REPRESENTATION Two expert systems are studied here. One is the The knowledge in the knowledge base is stored as expert system for validation of seismic stacking velocity rules which are represented in an IF-THEN format, TWO functions. The other is the exnert .
- Geophysics > Seismic Surveying > Seismic Processing (1.00)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling (1.00)
P and S wavefields can be separated in the f-k domain with a filter based on geophone receiving characteristics; these characteristics cot i' (b2 1)/2b
- North America > United States > Texas (0.15)
- Asia > Middle East > Saudi Arabia (0.15)
Because recovering the correct seismic reflection amplitude is almost impossible in conventional seismic processing, that We develop a method for the spherical divergence information is usually ignored by interpreters. In most correction of seismic reflection data based on normal movement interpretation work, only traveltime information is used to identify and stacking of cylindrical slant stacks.
Dip Correctionn of Shot Gathers in the Tau-p Domain s 1.4 The lower interface of the layer with velocity v is This paper deals with the seismic response of a 2-D dipping interface and presents a method for removal of the dip influence dipping at an angle 8, the downgoing ray forms an angle a with from the seismic arrival times in the z-p domain, with the the vertical and the upgoing ray forms an angle fi with the assumption that only primary reflections are present in seismic vertical. The Earth is assumed to be 2-D, and we ignore any data. The vertical travel times Z, as a response from a horizontal To derive the expression for the vertical travel times as a layer, form an ellipse when plotted as a function of the ray function of the ray parameter, we start from the equation given parameter p (Diebold and Stoffa, 1981), in both shot and CMP by Diebold and Stoffa (1981) gathers. For a CMP gather over a dipping interface, the ray parameter p for downgoing and upgoing rays becomes averaged, and the z -p cmve is again an ellipse. The z-p curve for a shot gather over a dipping interface is no longer an ellipse, but rather some other curve of the second order which is derived where z is the vertical travel time and z is the thickness of the in this paper.
- Geophysics > Seismic Surveying > Seismic Processing (0.70)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling (0.30)
The majority of seismic migrations per-example is subsalt prospecting in the deep formed in industry today are time migrations, water Gulf of Mexico. Lateral variations and use velocity distributions that vary in both water depth and salt layer thickness gradually in a lateral sense. Since the late create significant structural distortion on 197Os, depth migration has been recognized the seismic data. As salt velocities are as a necessary tool for properly imaging significantly higher than those of the seismic data in the presence of strong surrounding sediments, large velocity "pull ups" can lateral velocity contrasts. Careful definition of the the difference between these two Styles of salt boundaries and velocities is required migration, various methods involving for proper depth conversion, velocity modeling, time migration, and depth As complexity increases and velocity conversion are shown.
- North America > United States (0.39)
- North America > Mexico (0.27)
- Geophysics > Seismic Surveying > Seismic Processing > Seismic Migration (1.00)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling (0.83)
We describe a method for interpolation of severely abased A seismic section is divided into sequential overlapping time events as a two step model based procedure.
We describe an f-k filtering process which approximately Acquisition problems and/or trace editing result in seismic restores gaps in coherent events caused by null traces.