多种多次波压制技术提高可燃冰地震识别
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摘要
厄瓜多尔西海岸大陆斜坡地区发育大面积的可燃冰,其地震反射特征与海底反射极其相似。该区属于典型的深水区域且海底崎岖,其海洋地震资料存在自由表面多次波、层间多次波和绕射多次波等多种类型波。强能量多次波的存在,降低了资料的信噪比,影响了一次反射波的准确成像,也严重影响了可燃冰的地震识别。采用自由表面多次波压制(SRME)技术、高分辨率拉冬变换多次波压制技术和绕射多次波压制技术等串联组合,解决了该区多种类型多次波的压制问题,提高了利用地震资料识别可燃冰的能力,并预测了该区可燃冰的分布范围。
Large scale of combustible ice was developed in the continent slope area of the western coast of Ecuador.The seismic reflection characteristics are extremely similar to bottom simulating reflection(BSR).This area belongs to typical deep rugged sea bed,of which the free surface multiples,interbed multiples and diffracted multiples exist in the marine seismic data.Strong energy multiples can decrease the S/N ratio of data,and can affect the accurate imaging of primary reflection,even can severely influence the identification of combustible ice.The cascade combination of free surface multiple attenuation technique,high resolution Radon transform multiple attenuation technique and diffracted multiple attenuation technique were adopted to successfully solve the multiple attenuation problem in this area,which improves the ability of using seismic data to identify the combustible ice and can be used to predict the distribution scale of combustible ice in this area.
Large scale of combustible ice was developed in the continent slope area of the western coast of Ecuador.The seismic reflection characteristics are extremely similar to bottom simulating reflection(BSR).This area belongs to typical deep rugged sea bed,of which the free surface multiples,interbed multiples and diffracted multiples exist in the marine seismic data.Strong energy multiples can decrease the S/N ratio of data,and can affect the accurate imaging of primary reflection,even can severely influence the identification of combustible ice.The cascade combination of free surface multiple attenuation technique,high resolution Radon transform multiple attenuation technique and diffracted multiple attenuation technique were adopted to successfully solve the multiple attenuation problem in this area,which improves the ability of using seismic data to identify the combustible ice and can be used to predict the distribution scale of combustible ice in this area.
引文
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[3]许自强,李添才,万欢,等.三维深水崎岖海底区低信噪比地震资料处理策略[J].勘探地球物理进展,2010,33(2):99-106.
[4]Weglein A B.Multiple attenuation:An overview of recent advances and the road ahead[J].The Leading Edge,1999,18(1):40-44.
[5]李鹏,刘伊克,常旭,等.多次波问题的研究进展[J].地球物理学进展,2006,21(3):888-897.
[6]赵秀莲,陈茂根,龚定康,等.SRME技术在澳大利亚Timer Sea地区的应用[J].海洋石油,2009,29(4):48-52.
[7]渥.伊尔马兹.地震资料分析[M].刘怀山,王克斌,童思友,译.北京:石油工业出版社,2006:633-634.
[8]Li Hongtu,Huang Zhi,Guo Xiangyu.Cascade multiple suppression techniques in deepwater application[C].CPS/SEG International Geophysical Conference&Exposition:Beijing,2009.
[9]刘喜武,刘洪,李幼铭.高分辨率Radon变换方法及其在地震信号处理中的应用[J].地球物理学进展,2004,19(1):8-15.
[10]Herrmann P,Mojesky T,Magesan M,et al.De-aliased,high-reso-lution Radon transforms[C].SEG70th Annual International Meet-ing:Calgary,2000:1953-1956.
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