OBC 双检资料频谱陷波互补性差成因及处理思路

摘要/Abstract

摘要： 针对实际生产中遇到的OBC 双检资料频谱陷波互补性差的现象，从OBC 水、陆双检检波器接收波场入手，分析了水、陆双检检波器接收到的检波点虚反射和鸣震干扰的差异，认识到鸣震干扰的存在是造成水、陆双检资料频谱陷波互补性差的主要原因。通过对不同海底反射系数情况下，含有鸣震干扰的水检、陆检模拟子波进行分析，认识到水检资料频谱陷波随海底反射系数增大而增强，陆检资料频谱陷波随海底反射系数增大而消弱，海底反射系数越大，水、陆双检资料频谱陷波互补性越差。对于水检、陆检频谱陷波互补性差的OBC 资料，在选择双检合并方法衰减检波点虚反射时，不应对鸣震干扰造成影响，鸣震干扰在双检合并后，可利用预测反褶积等方法进行衰减，模拟数据和实际数据证明了该处理思路的正确性。

关键词: OBC；虚反射；频谱陷波；鸣震干扰；海底反射系数；双检合并

Abstract: In view of the poor complementation of frequency spectrum notch of OBC dual-sensor data, the differences in ghost and reverberation recorded by hydrophone and geophone have been analyzed from the perspective of receiving wave fields of OBC hydrophone and geophone, and it is recognized that reverberation is the cause of poor complementation of frequency spectrum notch between hydrophone data and geophone data. At the same time, analysis of hydrophone and geophone wavelet contaminated by reverberation at the different sea bottom reflection coefficients shows that when the sea bottom reflection coefficient increases, the hydrophone data frequency spectrum notch gets sharper, while the geophone data frequency spectrum notch gets weaker, therefore, the higher the sea bottom reflection coefficient, the poorer the complementation of frequency spectrum notch between hydrophone data and geophone data of the OBC dual-sensor data. For OBC data with poor complementation of frequency spectrum notch between hydrophone data and geophone data, dual-data combining method selected to attenuate ghost reflection of receiver points should not affect reverberation, the reverberation can be attenuated through deconvolution method after the combination of the hydrophone and geophone data. Simulated data and real data have proved that the processing method above is right.

Key words: ocean bottom cable(OBC), ghost, frequency spectrum notch, reverberation, sea bottom reflection coefficient, dual-data summing

龚旭东. OBC 双检资料频谱陷波互补性差成因及处理思路[J]. 中国石油勘探, 2015, 20(6): 52-59.

Gong Xudong. Causes of Poor Complementation of Frequency Spectrum Notch between Hydrophone Data and Geophone Data and The Data Processing method[J]. China Petroleum Exploration, 2015, 20(6): 52-59.

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