1. Institute of Geophysics and Geomatics, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China;
2. Key Laboratory of Exploration Technologies for oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan, Hubei 430010, China;
3. Key Laboratory of Tectonics and Petroleum Resources Ministry of Education, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China
Abstract:Multi-source simultaneous acquisition improves greatly marine seismic operation efficiency. However the blended wavefield separation is a key factor for good imaging of this kind of data. When pseudo blend records are sorted from common shot gathers to other domains, aliasing of the secondary source is transformed into random distribution noise. In this paper, we propose multi-source wavefield separation based an adaptive iteration multi-level median filtering. Small window size of the median filter can extract more details of the wanted wavefield. Real blended data tests show that after blended wavefield separation by the proposed approach, single shot records of every source is clear and their frequency spectrums are similar, which proves the validity of the proposed approach.
Berkhout A J,Blacquière G,Verschuur D J. Changing the mindset in seismic data acquisition. The Leading Edge,2008,27(7):924-938.
[2]
Zhang Q,Abma R,Ahmed I. A maring node simultaneous source acquisition trial at Atlantis,Gulf of Mexico. SEG Technical Program Expanded Abstracts,2013,32:99-103.
[3]
Kommedal J H,Napier P,Cegna A et al. Ocean bottom seismic acquisition off Trinidad using independent simultaneous sources. SEG Technical Program Expanded Abstracts,2013,32:368-372.
[4]
Alexander G,Abma R,Clarke R et al. Processing results of simultaneous source surveys compared to conventional surveys. SEG Technical Program Expanded Abstracts,2013,32:104-108.
[5]
Walker C D T,Hays D,Monk D. Blended source single sided full azimuth ocean bottom seismic acquisition. SEG Technical Program Expanded Abstracts,2013,32:157-160.
[6]
Spize S,Pica A Hampson. Simultaneous source separation:a prediction-subtraction approach. SEG Technical Program Expanded Abstracts,2008,27:2811-2815.
[7]
Moore I,Dragoset W,Ommundsen T et al. Simultaneous source separation using dithered sources. SEG Technical Program Expanded Abstracts,2008,27:2806-2809.
[8]
Akerberg P,Hampson G,Richett H et al. Simultaneous source separation by sparse radon transform. SEG Technical Program Expanded Abstracts,2008,27:2801-2804.
[9]
Huo S D,Luo Y,Kelamis P et al. Simultaneous sources separation via multi-directional vector-median filter. Geophysics, 2012,77(4):V123-V131.
[10]
Mahdad A,Doulgeris P,Blacquière G. Separation of blended data by iterative estimation and subtraction of blended interference noise. Geophysics,2011,76(3):Q9-Q17.
[11]
Mahdad A,Doulgeris P,Blacquière G. Iterative method for the separation of blended seismic data:Discussion on the algotithmic aspects. Geophysical Prospecting,2012,60(4):782-801.
[12]
Doulgeris P,Mahdad A,Blacquière G. Iterative sepa-ration of blended marine data:discussion on the co-herence-pass filter. SEG Technical Program Expanded Abstracts,2011,30:26-31.
Han Liguo,Tan Chenqing,Lü Qingtian et al. Separation of multi-source blended seismic acquisition data by iterative denoising. Chinese Journal of Geophy-sics,2013,56(7):2402-2412.
[14]
谭尘青. 多源地震混合采集波场高保真分离方法研究[学位论文]. 吉林长春:吉林大学,2013.
Tan Chenqing. Research on the High Fidelity Deblending of Multi-source Blended Seismic Acquisition Wavefield[D]. Jilin University,Changchun, Jilin,2013.
Liu Cai,Wang Dian,Liu Yang et al. Two-dimensional multilevel median filter technology in the application of the random noise elimination. OGP,2005,40(2):163-167.
Chen Meng,Fu Ping,Zhang Hongmei et al. Theoretical analysis of omnibearing multilevel median filter. Journal of Data Acquisition& Processing,1992,7(S):25-27.
Wang Qingzhen. Application of multilevel median filtering in 2D wavelet transform denoising technology. The Chinese Geophysics,Ningbo,Zhejiang,2010:485-486.