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The suppression of seismic source’s multiples in the water seismic reflection

The suppression of seismic source’s multiples in the water ...

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The 2nd International Conference on Environmental and Engineering Geophysics

作者： Xueqiang Zhang Xiangpeng Zhu Zhe Yan Xueming shi Institute of Geophysics and Geomatics China University of Geosciences Wuhan 430074 China

＜正＞More and more water exploration tasks are proposed. seismic reflection method is mostly used for underwater stratigraphic division or investigating and verifying geological structure. The method of multichannel receiving is difficultly applied, because the shotpoint and the geophones are hardly in a straight line, the spread hardly coincides with the survey line too. so the method of single channel receiving is often used. In this method, a ship or a bar is used as the seismic source. The former seismic source can produce great energy, but it is very heavy and needs lifting equipment. The latter seismic source produces energy more weakly, but it is light and convenient and can meet certain depth exploration requirements. Therefore, in the actual work, the seismic bar source is often applied. But multiple reflection produced by beating the top of the bar seismic source significantly reduces the quality of the water seismic data. The reliability of geological interpretation is also affected. Previously, such data was processed generally by the method of low-pass filtering, but the resolution of seismic data was lowered. In this article, we suppress the multiple waves by the method of predictive deconvolution and certify the validity of the method by numerical analogue. And then we propose a improved algorithm. The multiples in the record of the model can be absolutely eliminated by the improved algorithm. After the real-world data in which there is much serious interference produced by multiples is processed by the improved algorithm, the resolution and signal-to-noise ratio of the data is improved and a perfect result is achieved.

关键词： seismic reflection seismic source’s multiples predictive deconvolution bar seismic source resolution

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