潮汕坳陷多次波组合压制技术研究
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摘要
潮汕坳陷中生界发育,是我国海上重要的油气勘探后备区。但该区多次波非常发育,多次波识别和压制一直是该区地震资料处理的关键和难点。合理地选取有效的多次波压制方法是获得高品质地震剖面的关键所在。针对原始资料中多次波异常发育的情况,文章分析了该区多种类型多次波的特点,尝试了零偏移距截距时间-射线参数(τ-p)域预测反褶积、自由界面多次波衰减法(Surface-Related Multiple Elimination,SRME)和双曲线Radon变换,对多次波进行组合压制,克服了仅依靠一种手段难以压制多种类型多次波的局限。从资料处理效果看,τ-p域预测反褶积方法对短周期的鸣震和微曲多次波的压制效果较好,SRME有效地压制自由表面多次波,且在近炮检距范围内压制多次波效果很好,而双曲线Radon变换是衰减长周期的层间多次波和未被充分压制的自由表面多次波很好的选择。组合压制多次波后的剖面质量明显得到改善。
The Chaoshan Depression,where the Mesozoic strata well developed,is an important mothball area for gas and oil exploration in the South China Sea.Identification and suppression of seismic multiples are especially difficult and are the keys to this area.In order to obtain high-quality seismic profiles,combining methods for multiples suppression is critical.According to the original seismic data with abnormal development and various multiples in two dimensions,This paper analysises the types and properties of the multiples,trying to suppress multiples using combination method with predictive deconvolution in τ-p domain,Surface Related Multiples Elimination(SRME) and Hyperbolic Radon transform.Short-period reverberation and peg-leg multiples are effectively attenuated by predictive deconvolution;SRME method is used for suppressing surface-related multiples well,especially in the near-offset range;and hyperbolic radon transform is a good choice to attenuate long-period and surface-related multiples that are not sufficiently suppressed.As we expected,the quality of seismic profile improves significantly after suppress multiples using combination method.
The Chaoshan Depression,where the Mesozoic strata well developed,is an important mothball area for gas and oil exploration in the South China Sea.Identification and suppression of seismic multiples are especially difficult and are the keys to this area.In order to obtain high-quality seismic profiles,combining methods for multiples suppression is critical.According to the original seismic data with abnormal development and various multiples in two dimensions,This paper analysises the types and properties of the multiples,trying to suppress multiples using combination method with predictive deconvolution in τ-p domain,Surface Related Multiples Elimination(SRME) and Hyperbolic Radon transform.Short-period reverberation and peg-leg multiples are effectively attenuated by predictive deconvolution;SRME method is used for suppressing surface-related multiples well,especially in the near-offset range;and hyperbolic radon transform is a good choice to attenuate long-period and surface-related multiples that are not sufficiently suppressed.As we expected,the quality of seismic profile improves significantly after suppress multiples using combination method.
引文
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[3]陈隽,郝沪军,林鹤鸣.潮汕坳陷地震资料的改善及中生界构造的新发现[J].中国海上油气:地质,2002,16(4):271-278.
[4]刘长辉,王建鹏,曹军.海洋多次波特征和压制方法初探[J].石油天然气学报:江汉石油学院学报,2005,27(4):608-609.
[5]李丽青,梁蓓雯,徐华宁.海上单道地震资料中多次波的衰减[J].石油物探,2007,46(5):457-462.
[6]BERKHOUT A J,VERSCHUUR D J.Estimation of multiplescattering by iterative inversion,PartⅠ:Theoretical consid-erations[J].Geophysics,1997,62(5):1586-1595.
[7]崔树果.东海海域自由表面多次波压制方法研究[D].青岛:中国海洋大学,2008:1-103.
[8]王维红,崔宝文,刘洪.表面多次波衰减的研究现状与进展[J].地球物理学进展,2007,22(1):156-164.
[9]林文,魏大力,王建民,等.Radon变换多次波压制方法及应用研究[J].物探化探计算技术,2009,31(4):344-348.
[10]MITCHELL A R,KELAMIS P G.Efficient tau-p hyperbolicvelocity filtering[J].Geophysics,1990,55(5):619-625.
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