Prestack phase-screen migration for VSP data in gas hydrate zone

Y. G. Choi, J. Byun, S. Shin

Research output: Contribution to conferencePaper

Abstract

Prestack phase-screen migration for surface seismic data was adjusted to apply to VSP data. In addition, it was improved to be able to compensate the absorption, which may occur significantly in gas hydrate formation, if Q-factors of the layers are provided. To verify the algorithm, we applied it to synthetic seismic data obtained from the velocity model simulating gas-hydrate bearing zone, and compared the results of migration without and with compensating for absorption. The compensation for absorption during migration significantly improved the resolution of the migrate image. With spatial spectral analysis, we confirmed that the migration with compensation for absorption recovered the amplitudes of higher frequencies, which are affected more by absorption. Results of the test with real VSP data from gas hydrate zone showed that the base of gas hydrate zone, which is weakly depicted by conventional migration, was clearly identified by the phase-screen migration with compensating for absorption.

Original languageEnglish
Pages3393-3397
Number of pages5
StatePublished - 2006 Jan 1
EventSociety of Petroleum Engineers, 68th European Association of Geoscientists and Engineers Conference and Exhibition, incorporating SPE EUROPEC 2006, EAGE 2006: Opportunities in Mature Areas - Vienna, Austria
Duration: 2006 Jun 122006 Jun 15

Other

OtherSociety of Petroleum Engineers, 68th European Association of Geoscientists and Engineers Conference and Exhibition, incorporating SPE EUROPEC 2006, EAGE 2006: Opportunities in Mature Areas
CountryAustria
CityVienna
Period06/06/1206/06/15

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Gas hydrates
Bearings (structural)
Spectrum analysis
Compensation and Redress

Cite this

Choi, Y. G., Byun, J., & Shin, S. (2006). Prestack phase-screen migration for VSP data in gas hydrate zone. 3393-3397. Paper presented at Society of Petroleum Engineers, 68th European Association of Geoscientists and Engineers Conference and Exhibition, incorporating SPE EUROPEC 2006, EAGE 2006: Opportunities in Mature Areas, Vienna, Austria.
Choi, Y. G. ; Byun, J. ; Shin, S. / Prestack phase-screen migration for VSP data in gas hydrate zone. Paper presented at Society of Petroleum Engineers, 68th European Association of Geoscientists and Engineers Conference and Exhibition, incorporating SPE EUROPEC 2006, EAGE 2006: Opportunities in Mature Areas, Vienna, Austria.5 p.
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Choi, YG, Byun, J & Shin, S 2006, 'Prestack phase-screen migration for VSP data in gas hydrate zone', Paper presented at Society of Petroleum Engineers, 68th European Association of Geoscientists and Engineers Conference and Exhibition, incorporating SPE EUROPEC 2006, EAGE 2006: Opportunities in Mature Areas, Vienna, Austria, 06/06/12 - 06/06/15 pp. 3393-3397.

Prestack phase-screen migration for VSP data in gas hydrate zone. / Choi, Y. G.; Byun, J.; Shin, S.

2006. 3393-3397 Paper presented at Society of Petroleum Engineers, 68th European Association of Geoscientists and Engineers Conference and Exhibition, incorporating SPE EUROPEC 2006, EAGE 2006: Opportunities in Mature Areas, Vienna, Austria.

Research output: Contribution to conferencePaper

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AU - Choi, Y. G.

AU - Byun, J.

AU - Shin, S.

PY - 2006/1/1

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N2 - Prestack phase-screen migration for surface seismic data was adjusted to apply to VSP data. In addition, it was improved to be able to compensate the absorption, which may occur significantly in gas hydrate formation, if Q-factors of the layers are provided. To verify the algorithm, we applied it to synthetic seismic data obtained from the velocity model simulating gas-hydrate bearing zone, and compared the results of migration without and with compensating for absorption. The compensation for absorption during migration significantly improved the resolution of the migrate image. With spatial spectral analysis, we confirmed that the migration with compensation for absorption recovered the amplitudes of higher frequencies, which are affected more by absorption. Results of the test with real VSP data from gas hydrate zone showed that the base of gas hydrate zone, which is weakly depicted by conventional migration, was clearly identified by the phase-screen migration with compensating for absorption.

AB - Prestack phase-screen migration for surface seismic data was adjusted to apply to VSP data. In addition, it was improved to be able to compensate the absorption, which may occur significantly in gas hydrate formation, if Q-factors of the layers are provided. To verify the algorithm, we applied it to synthetic seismic data obtained from the velocity model simulating gas-hydrate bearing zone, and compared the results of migration without and with compensating for absorption. The compensation for absorption during migration significantly improved the resolution of the migrate image. With spatial spectral analysis, we confirmed that the migration with compensation for absorption recovered the amplitudes of higher frequencies, which are affected more by absorption. Results of the test with real VSP data from gas hydrate zone showed that the base of gas hydrate zone, which is weakly depicted by conventional migration, was clearly identified by the phase-screen migration with compensating for absorption.

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M3 - Paper

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Choi YG, Byun J, Shin S. Prestack phase-screen migration for VSP data in gas hydrate zone. 2006. Paper presented at Society of Petroleum Engineers, 68th European Association of Geoscientists and Engineers Conference and Exhibition, incorporating SPE EUROPEC 2006, EAGE 2006: Opportunities in Mature Areas, Vienna, Austria.