准中大沙漠区地震资料高精度处理技术

High precision seismic data processing techniques for the central desert area of Junggar Basin

准中大沙漠区地表起伏剧烈,低降速带速度厚度空间变化大,复杂的近地表结构致使地震资料的处理较东部地区有更大的难度。从准中大沙漠区的近地表特征出发,以中部区块为例,分析了大沙漠区地震资料的特点,探索了沙丘曲线静校正、波场延拓近地表吸收补偿、复合多域噪音压制、叠前时间偏移等处理技术在准中沙漠区的适应性。沙漠区资料处理效果良好。

With an undulating topography, variable thickness of the low velocity layer, the complexity of the near surface structure increases the difficulty of processing seismic data acquired from the central desert area of Junggar Basin. Aimed at the near surface feature and taking the central block as example, the characteristics of the seismic data are analyzed, and the adaptabilities of some data processing technique, such as dune curve static correction, wavefield continuation based on near-surface absorption compensation, composite multi-domain noise suppression, prestack time migration, are discussed, and a final good result has obtained.