Application of Deghosting and Designature for High-Resolution Seismic Data

Sumin Kim; Wookeen Chung; Sungryul Shin; Jiho Ha; Jungkyun Shin

doi:10.32390/ksmer.2021.58.5.433

All Issue

2021 Vol.58, Issue 5S Preview Page Next Page

Research Paper (Special Issue)

Application of Deghosting and Designature for High-Resolution Seismic Data 고해상 탄성파 탐사자료에의 디고스팅 및 디시그니쳐 적용

31 October 2021. pp. 433-443

PDF XML

Abstract

In contrast to the seismic explorations for oil and gas development, elementary seismic data processing techniques have been applied to seismic surveys in engineering. Additional seismic data processing is required for high-resolution seismic data to enhance its resolution. Therefore, deghosting and designature methods on high-resolution seismic data were investigated to eliminate the ghost and the effects of the source signature. For successful deghosting, the objective function based on the L1-norm was used to estimate the ghost delay time. In the case of designature, the source signature with the homogeneous three-dimensional (3D) Green's function was efficiently estimated, and the effects of the source signature were eliminated by using a newly defined source wavelet. The deghosting and designature were implemented on synthetic seismic and field datasets. Through the deghosting, the ghost delay time can be estimated by the L1-norm based objective function, and the ghost signal can be eliminated. In addition, the bandwidth of the amplitude spectrum was broadened by resorting the distorted frequency components. The results of the designature showed that the zero-phased traces were generated by eliminating the effects of the original source signature and convolving the newly defined zero-phased source wavelet.

Keywords

deghosting

designature

high-resolution seismic survey

엔지니어링 목적의 고해상 탄성파 탐사는 석유탐사 목적의 탄성파 탐사에 비해 기본적인 자료처리 기법을 사용하고 있다. 고해상 탐사자료의 해상도를 향상시키기 위한 추가적인 자료처리 기법이 필요하기 때문에, 본 연구에서는 고해상 탄성파 탐사자료에 대해 고스트를 제거할 수 있는 디고스팅과 송신파형의 영향을 제거할 수 있는 디시그니쳐의 적용가능성을 알아보았다. 성공적인 디고스팅을 위해 고스트 지연시간을 L1-norm 목적함수를 활용하여 고스트 지연시간을 추정하였다. 디시그니쳐의 경우에는 효율적인 연산을 위하여 균질매질에서의 3차원 그린함수를 이용하여 음원을 추정하고, 새롭게 정의된 파형요소를 콘볼루션하여 기존 송신파형의 영향을 제거하였다. 합성자료와현장자료에 대해 디고스팅과 디시그니쳐를 수행하였다. 디고스팅 적용 결과, L1-norm 목적함수를 통해 고스트 지연시간을 추정할 수 있었으며 고스트 신호가 제거됨에 따라 왜곡된 주파수 성분이 복원되어 진폭 스펙트럼 대역이 넓어짐을 확인하였다. 디시그니쳐의 경우, 기존 송신파형의 영향을 제거하고 새로운 영위상(zero-phase)의 파형요소를 콘볼루션함으로써 영위상 트레이스가 생성된 것을 확인할 수 있었다.

키워드

디고스팅

디시그니쳐

고해상 탄성파 탐사

References

Carlson, D.H., Long, A., Söllner, W., Tabti, H., Tenghamn, R., and Lunde, N., 2007. Increased resolution and penetration from a towed dual-sensor streamer, First Break, 25(12), p.71-77. 10.3997/1365-2397.25.12.27722

Davison, C.M. and Poole, G., 2015. Far-field source signature reconstruction using direct arrival data, 77th EAGE Conference and Exhibition 2015, p.1-5. 10.3997/2214-4609.201413326

Grion, S., Telling, R., and Barnes, J., 2015. De-ghosting by kurtosis maximisation in practice, SEG Technical Program Expanded Abstracts 2015, p.4605-4609. 10.1190/segam2015-5902239.1

Haavik, K.E. and Landrø, M., 2016. Estimation of source signatures from air guns fired at various depths: A field test of the source scaling law, Geophysics, 81(3), p.13-22. 10.1190/geo2015-0369.1

Hardwick, A., Charron, P., Masoomzadeh, H., Aiyepeku, A., Cox, P., and Laha, S., 2015. Accounting for sea surface variation in deghosting-a novel approach applied to a 3D dataset offshore west Africa, SEG Technical Program Expanded Abstracts 2015, p.4615-4619. 10.1190/segam2015-5901526.1

Kim, S.M., Koo, N.H., and Lee, H.Y., 2016. Broadband processing of conventional marine seismic data through source and receiver deghosting in frequency-ray parameter domain, Geophysics and Geophysical Exploration, 19(4), p.220-227. 10.7582/GGE.2016.19.4.220

Kim, Y., Cho, Y., and Shin, C., 2013. Estimated source wavelet‐incorporated reverse‐time migration with a virtual source imaging condition, Geophysical Prospecting, 61, p.317-333. 10.1111/j.1365-2478.2012.01119.x

Koo, N.H., Shin, C., Min, D.J., Park, K.P., and Lee, H.Y., 2011. Source estimation and direct wave reconstruction in Laplace-domain waveform inversion for deep-sea seismic data, Geophysical Journal International, 187(2), p.861-870. 10.1111/j.1365-246X.2011.05141.x

Lee, H.Y., Park, K.P., Koo, N.H., Yoo, D.G., Kang, D.H., Kim, Y.G., and Kim, J.C., 2004. High-resolution shallow marine seismic surveys off Busan and Pohang, Korea, using a small-scale multichannel system, Journal of Applied Geophysics, 56(1), p.1-15. 10.1016/j.jappgeo.2004.03.003

Lee, H.-Y., Koo, N.-H., Kim, B.-Y., Kang, M., and Park, K.-P., 2019. Status of Marine Seismic Exploration Technology, Journal of The Korean Society of Mineral and Energy Resources Engineers, 56(1), p.86-106 10.32390/ksmer.2019.56.1.086

Lindsey, J.P., 1960. Elimination of seismic ghost reflections by means of a linear filter, Geophysics, 25(1), p.130-140. 10.1190/1.1438679

Poole, G., Davison, C., Deeds, J., Davies, K., and Hampson, G., 2013. Shot-to-shot directional designature using near-field hydrophone data. SEG Technical Program Expanded Abstracts 2013, p.4236-4240. 10.1190/segam2013-0550.1

Posthumus, B.J., 1993. Deghosting Using a Twin Streamer configuration, Geophysical Prospecting, 41(3), p.267-286. 10.1111/j.1365-2478.1993.tb00570.x

Soubaras, R. and Dowle, R., 2010. Variable-depth streamer a broadband marine solution, First Break, 28(12), p.89-96. 10.3997/1365-2397.28.12.44692

Sun, Y. and Verschuur, E., 2018. Three‐dimensional receiver deghosting of seismic streamer data using L1 inversion and redundant extended radon dictionary, Geophysical Prospecting, 66(5), p.987-1003. 10.1111/1365-2478.12615

Zarkhidze, A., Oraghalum, E., Lansky, C., Raskopin, A., Rickett, J., and Bloor, R., 2016. Adaptive deghosting for complex geometries in the Gulf of Mexico, SEG Technical Program Expanded Abstracts 2016, p.5124-5128. 10.1190/segam2016-13868686.1

Zhang, Z., Wu, Z., Wang, B., and Ji, J, 2016. Adaptive windowed Deghosting-Applications to FAZ acquisition, 78th EAGE Conference and Exhibition 2016, p.1-5. 10.3997/2214-4609.201601582

Ziolkowski, A., Parkes, G., Hatton, L., and Haugland, T., 1982. The signature of an air gun array: Computation from near-field measurements including interactions, Geophysics, 47(10), p.1413-1421. 10.1190/1.1441289

Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 58
No :5
Pages :433-443
Received Date : 2021-08-10
Revised Date : 2021-09-29
Accepted Date : 2021-10-26
DOI :https://doi.org/10.32390/ksmer.2021.58.5.433

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

All Issue