Artículos de revistas
Aperture Effects In 2.5d Kirchhoff Migration: A Geometrical Explanation
Registro en:
Geophysics. , v. 68, n. 5, p. 1673 - 1684, 2003.
168033
2-s2.0-0242663673
Autor
Hertweck T.
Jager C.
Goertz A.
Schleicher J.
Institución
Resumen
Seismic images obtained by Kirchhoff time or depth migration are always accompanied by some artifacts known as migration noise, migration boundary effects, or diffraction smiles, which may severely affect the quality of the migration result. Most of these undesirable effects are caused by a limited aperture if the algorithms make no special disposition to avoid them. Strong amplitude variation along reflection events may cause similar artifacts. All of these effects can be explained mathematically by means of the method of stationary phase. However, such a purely theoretical explication is not always easily understood by applied geophysicists. A geometrical interpretation of the terms of the stationary-phase approximation in relation to the diffraction and reflection traveltime curves in the time domain can help to develop a more intuitive understanding of the migration artifacts. A simple numerical experiment for poststack (zero-offset) data indicates the problem and helps to demonstrate the effects and the methods to avoid them. 68 5 1673 1684 Abma, R., Sun, J., Bernitsas, N., Antialiasing methods in Kirchhoff migration (1999) Geophysics, 64, pp. 1783-1792 Bleistein, N., (1984) Mathematical Methods for Wave Phenomena, , Academic Press Inc Bleistein, N., On the imaging of reflectors in the earth (1987) Geophysics, 52, pp. 931-942 Bleistein, N., Cohen, J., Stockwell Jr., J., (2001) Mathematics of Multidimensional Seismic Imaging, Migration, and Inversion, , Springer-Verlag, New York, Inc Červený, V., (2001) Seismic Ray Theory, , Cambridge Univ. Press Červený, V., Soares, J., Fresnel volume ray tracing (1992) Geophysics, 57, pp. 902-915 Felsen, L., Marcuvitz, N., (1973) Radiation and Scattering of Waves, , Prentice-Hall, Inc Hagedoorn, J., A process of seismic reflection interpretation (1954) Geophys. Prosp., 2, pp. 85-127 Hubral, P., Schleicher, J., Tygel, M., Hanitzsch, C., Determination of Fresnel zones from traveltime measurements (1993) Geophysics, 58, pp. 703-712 James, G., (1976) Geometrical Theory of Diffraction for Electromagnetic Waves, , Peter Peregrinus Ltd Martins, J., Schleicher, J., Tygel, M., Santos, L., 2.5-D true-amplitude migration and demigration (1997) J. Seis. Expl., 6, pp. 159-180 Newman, P., Amplitude and phase properties of a digital migration process (1975) 37th Ann. Internat. Mtg., Euro. Assn. Expl. Geophys., 8, pp. 397-403. , Republished in First Break, 1990 Rohr, K., Scheidhauer, M., Trehu, A., Transpression between two warm mafic plates: The Queen Charlotte fault revisited (2000) J. Geophys. Res., 105, pp. 8147-8172 Scheidhauer, M., Trehu, A., Rohr, K., (1999) Multi-Channel Seismic Reflection Survey Over the Northern Queen Charlotte Fault, Offshore British Columbia, , Geological Survey of Canada Open File Report 3779 Schleicher, J., Hubral, P., Tygel, M., Jaya, M., Minimum apertures and Fresnel zones in migration and demigration (1997) Geophysics, 62, pp. 183-194 Schleicher, J., Tygel, M., Hubral, P., 3-D true-amplitude finite-offset migration (1993) Geophysics, 58, pp. 1112-1126 Schneider, W., Integral formulation for migration in two and three dimensions (1978) Geophysics, 43, pp. 49-76 Sun, J., On the limited aperture migration in two dimensions (1998) Geophysics, 63, pp. 984-994 Sun, J., On the aperture effect in 3-D Kirchhoff-type migration (1999) Geophys. Prosp., 47, pp. 1045-1076 Sun, J., Limited aperture migration (2000) Geophysics, 65, pp. 584-595 Sun, S., Bancroft, J., How much does the migration aperture actually contribute to the migration result? (2001) 71st Ann. Internat. Mtg., Soc. Expl. Geophys., pp. 973-976. , Expanded Abstracts Tygel, M., Schleicher, J., Hubral, P., Pulse distortion in depth migration (1994) Geophysics, 59, pp. 1561-1569 Tygel, M., Dualities between reflectors and reflection-time surfaces (1995) J. Seis. Expl., 4, pp. 123-150 Wapenaar, C., The infinite aperture paradox (1992) J. Seis. Expl., 1, pp. 325-336 Yilmaz, Ö., Seismic data analysis (2001) Soc. Expl. Geophys.