Abstract：In most cases,far-field wavelets are notional,and they are quite different from acquired wavelets.Therefore,data after debubbling based on far-field wavelets have obvious residual bubbles.This paper proposes a data-driven debubbling method.It extracts wavelets by the cross-correlation of data,calculates the debubbling operator based on extracted wavelets and expected wavelets (without bubbles),and then debubbles data.In addition,the paper analyzes two main factors affecting the debubbling results of the method:①The length of the debubbling operator.It has an impact on debubbling effect,and it is decided by bubble oscillations; ② White noise.It has a bad influence on the notch of ghosts; and as the white noise increases,it will artificially enhance the notch and reduce the deghosting effect.Therefore,during debubbling,it is better to apply a less white noise.The new method based on extracted wavelets solves the problem of the method based on far-field wavelets.The latter doesn't consider the influence of acquisition conditions on wavelets.The new method can remove bubble oscillations more effectively,increase signal to noise ratio (SNR) and resolution,and maintain the fidelity of data.All of these have been proven by the processing results of field data.
马光凯, 周铮铮, 李建锋, 李培明, 张红英, 蔡东地. 利用提取的子波压制气泡效应及影响因素分析[J]. 石油地球物理勘探, 2020, 55(6): 1237-1244.
MA Guangkai, ZHOU Zhengzheng, LI Jianfeng, LI Peiming, ZHANG Hong-ying, CAI Dongdi. A debubbling method based on extracted wavelet and its controlling factors. Oil Geophysical Prospecting, 2020, 55(6): 1237-1244.
蒋生淼.气枪震源信号提取方法与传播特性研究[D].北京:中国地震局地球物理研究所,2017.JIANG Shengmiao.Processing Method and Propagation Characteristics of Airgun Source Signals[D].The Institute of Geophysics of China Earthquake Admi-nistration,Beijing,2017.
[2]
Ziolkowski A,Parkes G,Hatton L,et al.The signature of an air gun array:computation from near-field measurements including interactions[J].Geophysics,1982,47(10):1413-1421.
[3]
倪成洲,陈浩林,牛宏轩.基于近场测量气枪阵列远场子波模拟软件研发[J].物探装备,2008,18(1):11-17.NI Chengzhou,CHEN Haolin and NIU Hongxuan.Development of software based on near-field measurement of airgun array for simulation of far-field wavelet[J].Equipment for Geophysical Prospecting,2008,18(1):11-17.
[4]
陈浩林,全海燕,刘军,等.基于近场测量的气枪阵列模拟远场子波[J].石油地球物理勘探,2005,40(6):703-707.CHEN Haolin,QUAN Haiyan,LIU Jun,et al.Simulation of far-field wavelet based on near-field measuring gun-array[J].Oil Geophysical Prospecting,2005,40(6):703-707.
[5]
杨怀春,高生军.海洋地震勘探中空气枪震源激发特性研究[J].石油物探,2004,43(4):323-326.YANG Huaichun and GAO Shengjun.The signatures of seismic wavelet excited by air guns in marine seismic survey[J].Geophysical Prospecting for Petroleum,2004,43(4):323-326.
[6]
李绪宣,王建花,张金淼,等.海上气枪震源阵列优化组合设计与应用[J].石油学报,2012,33(增刊1):142-148.LI Xuxuan,WANG Jianhua,ZHANG Jinmiao,et al.Design and application of air-gun arrays in marine seismic exploration[J].Acta Petrolei Sinica,2012,33(S1):142-148.
[7]
Wood L C,Heiser R C,Treitel S,et al.The debubbling of marine source signature[J]. Geophysics,1978,43(4):715-729.
[8]
李高林.气枪震源子波特性分析与处理技术研究[D].山东青岛:中国海洋大学,2011.LI Gaolin.Air Gun Source Signature Analysis and Processing Technology Study[D].Ocean University of China,Qingdao,Shandong,2011.
[9]
Chen Y K,Gan S W,Qu S,et al.Sparse inversion for water bubble removal and spectral enhancement[J].Journal of Applied Geophysics,2015,117(6):81-90.
[10]
Davison C M and Poole G.Far-field source signature reconstruction using direct arrival data[C].Extended Abstracts of 77th EAGE Conference & Exhibition,2015,doi:10.3997/2214-4609.201413326.
[11]
任婷,彭海龙,覃殿明,等.深水区直达波子波提取气泡效应压制技术[J].石油地球物理勘探,2018,53(2):243-250.REN Ting,PENG Hailong,QIN Dianming,et al.De-bubble based on wavelet extraction from direct wave in deep water[J].Oil Geophysical Prospecting,2018,53(2):243-250.
[12]
Colin S,Richard W,and Darren R G.Improving the interpretability of air-gun seismic reflection data using deterministic filters:A case history from offshore Cape Leeuwin,southwest Austrlia[J].Geophysics,2011,76(3):B113-B125.
[13]
Yilmaz O.Seismic Data Processing[M].SEG,1987,83-150.
[14]
刘艳杰.基于高阶谱提取地震子波方法的研究[D].四川成都:成都理工大学,2011.LIU Yanjie.Research on the Method of Seismic Wavelet Extraction Based on Higher-order Spectrum[D].Chengdu University of Technology,Chengdu,Sichuan,2011.
[15]
王卫华.用时间域希尔伯特变换求取信号的最小相位谱[J].石油地球物理勘探,1986,21(3):268-275.WANG Weihua.Extracting the minimum phase spectrum of signal by Hilbert transform in time domain[J].Oil Geophysical Prospecting,1986,21(3):268-275.
[16]
段云卿.匹配滤波与子波整形[J].石油地球物理勘探,2006,41(2):156-159.DUAN Yunqing.Matched filtering and wavelet shaping[J].Oil Geophysical Prospecting,2006,41(2):156-159.
[17]
Barker D and Landrø M.Simple expression for the bubble-time period of two clustered air guns[J].Geophysics,2012,77(1):A1-A3.
[18]
Zhou Z Z and Ma G K.Phase-driven deghosting of slanted and horizontal streamer data[C].SEG Technical Program Expanded Abstracts,2016,35:4756-4759.
[19]
高德荫,林中柏.最小平方反滤波和白噪[J].石油地球物理勘探,1981,16(6):11-17.
[20]
李秉富,魏长江.地震资料处理中最小平方反滤波白噪化分析[J].青岛海洋大学学报,1994,24(增刊3):39-44.LI Bingfu,WEI Changjiang.Inverse filtering by least squares and whitened noise analysis[J].Journal of Ocean University of Qingdao,1994,24(S3):39-44.
