摘要:
深水地震资料多次波具有能量强、周期长的特点,降低了资料的信噪比,是处理人员面临的首要问题。多次波衰减效果的好坏,直接影响着最终成像效果及后期储层反演结果的真实性。分析深水多次波的类型、成因和特征,并研究各种多次波衰减技术的优缺点和适用性,最终合理组合多方法、分步衰减多次波是关键。以南海A区深水地震资料为例,通过组合优选基于模型的SRME技术和高分辨率Radon技术进行了实际应用,并就出现的剩余多次波给予分析和改进,提出了"三步法"衰减深水多次波,应用后取得了显著的多次波衰减效果。
Abstract:
In deep water seismic survey, multiples are strong in energy and long in effecting time. As the results, S/N ratio will be reduced and the quality of final images and the reliability of reservoirs inversion seriously effected. Therefore, the elimination of multiples remains the key problem of deep water seismic processing. The first work to be done is to know the type, causes and characteristics of multiples. Then, endeavor should be made to evaluate the advantages and disadvantages of multiple attenuation methods available so as to make a reasonable choice to combine these methods together to attenuate the multiples. This paper uses the seismic data from an area of the South China Sea, a combination of SRME and high resolution Radon filter technique is adopted to attenuate the residual multiples. The so-called combined three-step multiple elimination method has been proven an effective tool to achieve better quality of data processing.
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