水深对OBC地震资料的影响分析与对策

The analysis and strategy of influence of water depth to OBC seismic data

基于Lawton等人的研究成果,本文分析了OBC勘探中水深对面元属性以及地震资料的影响。文中采用常规PATCH观测系统,研究了宽、窄方位观测系统在近炮检距和远炮检距时覆盖次数的变化情况;在较深水域接收时应根据目的层要求优化观测系统设计;通过模型的正演分析,讨论了较深水域OBC数据处理过程中的特殊性,并提出通过波场延拓方法进行校正,以降低水深的影响。

Based on the research results by Lawton et al.,the influence of water depth to bin attribute and seismic data in OBC exploration was discussed in this paper.By applying conventional PATCH geometry,the fold changing for near offset and far offset under both the wide and the narrow geometries were studied,it was founded out in the studies that in order to meet the need of target zone the geometry designing optimization is needed when the survey was acquired in the relatively deep water area,through forward modeling analysis the specialties of seismic data processing in the relatively deep water area were discussed,the wave field continuation method was proposed to conduct the correction in order to relieve the influence of the deep water.