A METHOD TO REDUCE SEA BOTTOM REVERBERATIONS BASED ON PREDICTIVE DECONVOLUTION
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摘要: 多次波问题是海洋地震勘探中最突出的问题之一,多次波的存在影响地震成像的真实性和可靠性,干扰地震资料的解释。尤其在海底起伏不平时的鸣震干扰,至今还没有很有效的办法。研究提出的两步法预测反褶积压制海底鸣震方法,就是利用基于精细海底调查的结果获得预测步长或由直达波、折射波反演求取预测步长,在共炮点域和共检波点域分别应用预测反褶积来压制海底鸣震。该技术在理论和实际记录上均有很好的效果。Abstract: Multiple reflection is one of the most prominent problems in marine seismic survey. The existence of the multiple reflection affects the reliability and authenticity of seismic imaging as well as the interpretation of seismic data. So far there have been no effective methods to reduce the reverberations especially where the sea-bottom is rough. Two-step predictive deconvolution raised in this article is a method used for reducing the sea bottom reverberations,this method acquires a predicted distance from the results of fine investigation of sea bottom, or from the inversion of direct or refracted waves. Then we reduce the sea bottom reverberations by predictive deconvolution in both common-shot domain and common-receiver domain. It is very effective both in theory and practical record.
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Key words:
- seismic exploration /
- predictive deconvolution /
- sea bottom reverberations
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