COMPLEX MULTIPLES AND THEIR SUPPRESSION STRATEGY IN DEEP WATER SEISMIC EXPLORATION IN QIONGDONGNAN BASIN
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摘要:
深水已是目前油气勘探的主战场之一，但其复杂的地震多次波严重地影响了地震资料的信噪比和中深层成像。近来基于地震波动理论的多次波压制技术已经显现出明显的优势，并通过匹配相减的方法衰减多次波，具有更好的保幅性。但在实际地震资料处理中仍面临诸多多次波压制难题，深水崎岖海底的地震多次波压制依靠单一的方法不能解决全部问题。从地震多次波特征分析入手，研究了深水区主要的多次波类型，进行了多次波压制技术的优化和组合，使其具有更好的适用性和多次波压制效果。
Abstract:Exploration and discoveries have confirmed that oil and gas are rich in deep water areas. However, complex multiples seriously affect the signal-to-noise ratio of the dataset and the quality of images in the middle to deep water areas. Recently, multiple technology based on the theory of multiple wave has rapidly developed. Comparing to the traditional multiple suppression technology including predictive deconvolution and 2D filtering and so on, it requires less prior information and may predict multiple models to attenuate multiples by matching subtraction so as to better preserve the primary amplitudes. However, there are still many difficulties in actual data processing, for examples, losing near offset in shallow water region and the influence of water bottom topography. There need integrated approaches to eliminate multiples with complex wave field. In this paper, we studied the model prediction for multiple attenuation and summarized the differences and application of multiple models.
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Key words:
- deep water /
- multiple attenuation /
- character analysis /
- SNR /
- Qiongdongnan Basin
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