해양 탄성파 반사법 탐사자료의 다중반사파 제거 최적화 연구 = Optimization for Multiple Attenuation of Marine Seismic Reflection Data

다국어 초록 (Multilingual Abstract)

One of the most challenging problems for subsurface imaging is removing multiples from marine seismic reflection data. In order to establish multiple suppression processing procedure, we applied Surface-Related Multiple Elimination (SRME), Frequency-Wavenumber (FK) filtering, and predictive deconvolution to synthetic data and seismic field data. In this study, it was verified that the method for combination of SRME module and FK filtering is effective for suppressing multiples produced by free surface in numerical test. To suppress surface multiples in field data which had been acquired at continental shelf, we tried to apply processing procedures of SRME module, FK filtering, and predictive deconvolution to shot gathers which have periodic high amplitude. After obtaining stacked images with shot gathers suppressed surface multiples, we conducted comparative analysis of them. The result shows that the processing procedure combining of SRME module and FK filtering is effective to suppress multiples.

국문 초록 (Abstract)

해양 탄성파 반사법 탐사자료에는 다중반사파가 존재하기 때문에 이를 제거하지 않은 탐사자료로 정확한 지하지층구조를 영상화하는 것은 한계가 있다. 본 논문에서는 해수면기인 다중반사파 제거모듈(Surface-Related Multiple Elimination; SRME)과 주파수-파수(Frequency-Wavenumber; FK) 필터링, 예측 곱풀기를 조합하여 인공합성 탄성파자료와 현장자료에 적용함으로써 다중반사파 제거 자료처리 공정을 확립하였다. 수치모형실험에서 다수의 지층경계면에 의해 생성된 다중반사파를 제거하기 위한 방법으로 SRME 모듈과 FK필터링을 조합하여 수행하는 것이 효과적임을 입증하였다. 현장자료의 중합단면에서 강한 진폭으로 주기적으로 나타나는 표면 다중반사파(Surface multiple)를 제거하기 위하여 SRME 모듈과 FK 필터링, 예측 곱풀기를 조합하여 음원모음에 적용하고 중합단면을 만들어 비교 ‧ 분석 하였다. 그 결과 SRME 모듈과 FK 필터링을 조합한 방법이 효과적임을 알 수 있었다.

참고문헌 (Reference)

1 고진석, "황해 제 3광구 1724 측선 탄성파자료의 중합전 심도 구조보정" 한국자원공학회 46 (46): 563-570, 2009

2 정순홍, "동해 남동해역 다중채널 해양탄성파 탐사자료의 해저면, 페그-레그 및 자유해수면 다중반사파 제거 최적화 전산처리" 한국지구물리.물리탐사학회 12 (12): 289-298, 2009

3 정순홍, "도미퇴적분지 해양탄성파 탐사자료 최적 전산처리 변수도출" 한국지구물리.물리탐사학회 11 (11): 279-285, 2008

4 Anstey, N.A, "The sectional autocorrelogram and the sectional retro-correlogram" 14 (14): 389-426, 1966

5 Hardy, R.J.J, "The reliability of multiple suppression" 8 (8): 297-304, 1990

6 Hadidi, M.T, "Surfacerelated multiple elimination on wide-tow marine data" The Leading Edge 787-790, 2002

7 Dragoset, W.H, "Some remarks on surface multiple attenuation" 63 (63): 772-789, 1998

8 Berkhout, A.J, "Seismic migration: Imaging of acoustic energy by wavefield extrapolation. part A: Theoretical aspects,2nd Ed" ElsevierScience 211-218, 1982

9 Peacock, K.L, "Predictive deconvolution: theory and practice" 34 (34): 155-169, 1969

10 Lokshtanov, D, "Multiple suppression by single channel and multichannel deconvolution in the tau-p domain" 1482-1485, 1995

11 Keydar, S, "Multiple prediction using the homeomorphic-imagingtechnique" 46 (46): 423-440, 1998

12 Weglein, A.B, "Multiple attenuation: an overview of recent advances and the road ahead" The Leading Edge 40-44, 1999

13 Wiggins, W, "Multiple attenuation by explicit wave extrapolation to an interpreted horizon" The Leading Edge 46-54, 1999

14 Taner, M. T., "Long period sea-floor multiples and their suppression" 28 : 30-48, 1980

15 Hampson, D, "Inverse velocity stacking for multiple elimination" 22 (22): 44-55, 1986

16 Ryu, J.V, "Decomposition (DECOM) approach applied to wave field analysis with seismic reflection records" 47 (47): 869-883, 1982

17 Mayne, W.H, "Common reflection point horizontal data stacking technique" 27 (27): 927-938, 1962

18 Li, H, "Cascade Multiple suppression Techniques in Deepwater Application" CPS/SEG 2009

19 Wiggins, J.W, "Attenuation of complex water-bottom multiples by wave-equation-based prediction and subtraction" 53 (53): 1527-1539, 1988

20 Weglein, A.B, "An inverse-scattering series method for attenuating multiples in seismic reflection data" 62 (62): 1975-1989, 1997

21 Verschuur, D.J, "Adaptive surface-related multiple elimination" 57 (57): 1166-1177, 1992

22 Hardy, R.J.J, "A strategy for multiple suppression" 9 (9): 139-144, 1991