Browse > Article
http://dx.doi.org/10.7582/GGE.2019.22.4.225

A Study on Field Seismic Data Processing using Migration Velocity Analysis (MVA) for Depth-domain Velocity Model Building  

Son, Woohyun (Petroleum and Marine Division, Korea Institute of Geoscience and Mineral Resources)
Kim, Byoung-yeop (Petroleum and Marine Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Geophysics and Geophysical Exploration / v.22, no.4, 2019 , pp. 225-238 More about this Journal
Abstract
Migration velocity analysis (MVA) for creating optimum depth-domain velocities in seismic imaging was applied to marine long-offset multi-channel data, and the effectiveness of the MVA approach was demonstrated by the combinations of conventional data processing procedures. The time-domain images generated by conventional time-processing scheme has been considered to be sufficient so far for the seismic stratigraphic interpretation. However, when the purpose of the seismic imaging moves to the hydrocarbon exploration, especially in the geologic modeling of the oil and gas play or lead area, drilling prognosis, in-place hydrocarbon volume estimation, the seismic images should be converted into depth domain or depth processing should be applied in the processing phase. CMP-based velocity analysis, which is mainly based on several approximations in the data domain, inherently contains errors and thus has high uncertainties. On the other hand, the MVA provides efficient and somewhat real-scale (in depth) images even if there are no logging data available. In this study, marine long-offset multi-channel seismic data were optimally processed in time domain to establish the most qualified dataset for the usage of the iterative MVA. Then, the depth-domain velocity profile was updated several times and the final velocity-in-depth was used for generating depth images (CRP gather and stack) and compared with the images obtained from the velocity-in-time. From the results, we were able to confirm the depth-domain results are more reasonable than the time-domain results. The spurious local minima, which can be occurred during the implementation of full waveform inversion, can be reduced when the result of MVA is used as an initial velocity model.
Keywords
seismic; data processing; migration velocity analysis; depth domain;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Bancroft, J. C., 1997, A Practical Understanding of Pre- and Poststack Migrations, Vol. I, Soc. Expl. Geophys.
2 Biondi, B. L., 2006, 3D Seismic Imaging, Soc. Expl. Geophys.
3 Cameron, M., Fomel, S. B., and Sethian, J. A., 2008, Time-todepth conversion and seismic velocity estimation using timemigration velocity, Geophysics, 73(5), VE205-VE210.   DOI
4 Dix, C. H., 1955, Seismic velocities from surface measurements, Geophysics, 20(1), 68-86.   DOI
5 Douglas, J. F., and Charles C. M., 1992, Suppression of multiple reflections using the Radon transform, Geophysics, 57(3), 386-395.   DOI
6 Francis, A., 2018, A Simple Guide to Seismic Depth Conversion I, GeoExPro, 15(2), Online Article.
7 Gardner, G. H. F., French, W. S., and Matzuk, T., 1974, Elements of migration and velocity analysis, Geophysics, 39(6), 811-825.   DOI
8 Gray, S. H., and May, W. P., 1994, Kirchhoff migration using eikonal equation traveltimes, Geophysics, 59(5), 810-817.   DOI
9 Liu, Z., and Bleistein, N., 1995, Migration velocity analysis: Theory and an iterative algorithm, Geophysics, 60(1), 142-153.   DOI
10 Peacock, K. L., and Treitel, S., 1969, Predictive deconvolution - theory and practice, Geophysics, 34(2), 155-169.   DOI
11 Sakamori, M., and Biloti, R., 2018, Coherence-based time migration velocity analysis by the use of supergathers, Geophysics, 83(2), S173-S184.   DOI
12 Sava, P., and Biondi, B., 2004, Wave-equation migration velocity analysis. I. Theory, Geophys. Prospect., 52(6), 593-606.   DOI
13 Stork, C., 1992, Reflection tomography in the postmigrated domain, Geophysics, 57(5), 680-692.   DOI
14 Stork, C., 1994, Demonstration of mva tomography with controls and constraints for determining an accurate velocity model for prestack depth migration, 64th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 1338-1342.
15 Stork, C., and Clayton, R. W., 1991, Linear aspects of tomographic velocity analysis, Geophysics, 56(4), 483-495.   DOI
16 Yilmaz, O., 2001, Seismic data analysis: Processing, Inversion, and Interpretation of Seismic data, Vol. II, Soc. Expl. Geophys.
17 Symes, W. W., 2008, Migration velocity analysis and waveform inversion, Geophys. Prospect., 56(6), 765-790.   DOI
18 Vidale, J., 1988, Finite-difference calculation of traveltimes, Bull. Seismol. Soc. Amer., 78(6), 2062-2076.
19 Vidale, J., 1990, Finite-difference calculation of traveltimes in three dimensions, Geophysics, 55(5), 521-526.   DOI