Prestack depth migration for complex 2D structure using phase-screen propagators
- Los Alamos National Lab., NM (United States)
- Conoco, Inc. (United States)
We present results for the phase-screen propagator method applied to prestack depth migration of the Marmousi synthetic data set. The data were migrated as individual common-shot records and the resulting partial images were superposed to obtain the final complete Image. Tests were performed to determine the minimum number of frequency components required to achieve the best quality image and this in turn provided estimates of the minimum computing time. Running on a single processor SUN SPARC Ultra I, high quality images were obtained in as little as 8.7 CPU hours and adequate images were obtained in as little as 4.4 CPU hours. Different methods were tested for choosing the reference velocity used for the background phase-shift operation and for defining the slowness perturbation screens. Although the depths of some of the steeply dipping, high-contrast features were shifted slightly the overall image quality was fairly insensitive to the choice of the reference velocity. Our jests show the phase-screen method to be a reliable and fast algorithm for imaging complex geologic structures, at least for complex 2D synthetic data where the velocity model is known.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 625880
- Report Number(s):
- LA-UR-97-1544; CONF-971111-; ON: DE97007365; TRN: AD-a339 780
- Resource Relation:
- Conference: 67. annual meeting and expo of the Society of Exploration Geophysicists (SEG), Dallas, TX (United States), 2-7 Nov 1997; Other Information: PBD: Nov 1997
- Country of Publication:
- United States
- Language:
- English
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