Abstract:The surface in the hinterland of the Junggar Basin is mainly desert and ecological forest. From the analysis of the east-west section, it is known that the wave group characteristics and the frequency and phase characteristics corresponding to the two types of surface are greatly different, which results in the obvious "Yin-yang face" phenomenon on the seismic section. Therefore, considering the single shot records on different types of surface, we analyzed the reasons for the "trapping" characteristics in the first-break frequency spectrum. Combined with the demonstration and analysis of the surface structure and forward mo-del, we believe that complex near-surface multiple waves are the main factor causing the "Yin-yang face" phenomenon. Moreover, the strength and specific location of trapping are clarified, and thus this paper proposes a predictive variant-step deconvolution technology based on the difference of tra-vel time and of the time of the first trough in autocorrelation, which has an obvious suppression effect on near-surface multiple waves in this area and improves and eliminates the phenomenon of "Yin-yang face". This method has been widely used and applied in other blocks in the hinterland of the Junggar Basin, and good results have been achieved.
林娟, 蒋立, 潘龙, 冷雪梅, 张欣吉, 游伟. 复杂近地表多次波分析及压制方法探讨——准噶尔盆地腹部地震资料处理实例[J]. 石油地球物理勘探, 2021, 56(6): 1229-1235.
LIN Juan, JIANG Li, PAN Long, LENG Xuemei, ZHANG Xinji, YOU Wei. Analysis of complex near-surface multiple waves and discussion on suppression methods: a case of seismic data in the hinterland of the Junggar Basin. Oil Geophysical Prospecting, 2021, 56(6): 1229-1235.
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