最大能量法剩余静校正的改进
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摘要
常规最大能量法在处理复杂地区具有大时移量的低信噪比地震资料时容易出现"周波跳跃"现象,使得算法收敛于局部极值,造成构造假象。为此,本文提出了提高信噪比、压制"周波跳跃"现象的改进措施。其内容包括:使用模型道多道混波技术提高信噪比,改善模型道质量;使用慢速扩展相空间技术,避免"周波跳跃"现象;使用静校正量的空间约束滤波,克服静校正处理的"零空间"漂移现象。理论模型试验和实际资料的应用结果说明,采取本文改进措施能够进一步提高常规最大能量法在复杂地区剩余静校正处理中的适应能力。
Using conventional maximum energy method to process low S/N Ratio seismic data with large time shift in complex areas often results in cycle skip phenomenon,which then further leadiing to convergence to local maximum for the algorithm and the false structure.To solve the problem,this paper proposed the improvement measures for raising S/N ratio and suppressing cycle skip phenomenon.The measures can be summarized as below:using model trace multi-channel mixed wave technique to raise S/N ratio and improve model trace quality,utilizing slow expansion phase space technique to avoid cycle skip phenomenon,applying static correction spatial constrained filtering to overcome "null space" drift phenomenon in static correction processing.The results from theory model testing and application of the field data show that the proposed improvement measures in this paper could raise the adaptability of the conventional maximum energy method in static correction processing for seismic data from the complex areas.
Using conventional maximum energy method to process low S/N Ratio seismic data with large time shift in complex areas often results in cycle skip phenomenon,which then further leadiing to convergence to local maximum for the algorithm and the false structure.To solve the problem,this paper proposed the improvement measures for raising S/N ratio and suppressing cycle skip phenomenon.The measures can be summarized as below:using model trace multi-channel mixed wave technique to raise S/N ratio and improve model trace quality,utilizing slow expansion phase space technique to avoid cycle skip phenomenon,applying static correction spatial constrained filtering to overcome "null space" drift phenomenon in static correction processing.The results from theory model testing and application of the field data show that the proposed improvement measures in this paper could raise the adaptability of the conventional maximum energy method in static correction processing for seismic data from the complex areas.
引文
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[2]DuBose J B Jr.Practical steps toward realizing the potential of Monte Carlo automatic statics.Geophys-ics,1993,58(3):399～407
[3]O′Brien P N S.Aspects of seismic researchin the oil industry.Geoexploration,Elsevier Scientific Publish-ing Company,1974,12:75～96
[4]Disher D A and Naquin P J.Statistical automatic statics analysis.Geophysics,1970,35(4):574～585
[5]曹聿明等.优化模型道剩余静校正.石油地球物理勘探,1996,31(增2):60～66,79
[6]唐建候,张金山.消除P-SV波大静校正量的方法.石油地球物理勘探,1994,29(5):650～653
[7]井西利.大剩余静校正量求解的多尺度反演方法研究.石油地球物理勘探,2009,44(5):564～568
[8]王海等.柴北缘地区地震静校正技术研究.石油地球物理勘探,2009,44(增刊1):150～153
[9]王立新.叠加速度与剩余静校正量的迭代计算.石油物探,2001,40(4):25～33
[10]陈启元等.复杂山区的静校正方法探讨.石油物探,2001,40(1):73～81
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