浅析薄互层地震调谐影响因素

Analysis of Influencing Factors of Tuning Thickness for Thin Interlayers

摘要: 一直以来，地震薄层或薄互层解释以振幅极值对应地震资料的1/4波长为准则，称为调谐厚度。本文通过设计多套薄层、薄互层模型并分析正演结果证实，薄层和薄互层的地震调谐厚度是不同的。进一步实验证实“1/4波长”的调谐厚度理论值只适用于地震波垂直入射在单薄层的情况下，薄互层的调谐厚度随着薄互层结构的变化而有不同程度的减小。

Abstract: Up until now, 1/4 wavelength of the seismic wave is treated as the tuning thickness for the thin layers or thin interlayers in the seismic interpretation. To investigate this criterion, in this paper, we design several sets of thin layer and interlayer models and analyze the corresponding forward modelling results. The results show that the tuning thickness for the thin layer is different from that for the thin interlayer. This demonstrates that the theoretical tuning thickness of 1/4 wavelength is only applicable for the situation where the seismic wave propagates perpendicularly to the thin layers. The tuning thickness for the thin interlayers decreases to a certain extent depending on the variation of the structure of the thin interlayers.