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红北地区位于准噶尔盆地,构造复杂,地层倾角大,三维叠后时间偏移成像效果不好,为此,在该地区开展了三维叠前时间偏移处理技术的研究。介绍了三维叠前时间偏移方法的基本原理和实现过程,对该方法在红北地区的应用效果进行了分析。叠前时间偏移剖面和叠后时间偏移剖面的对比说明,地震资料的成像精度得到了较大的提高,剖面上断点清楚,断层清晰,地震波组特征明显,与井的吻合程度高。
The north of Hongbei is located in the Junggar Basin, which is characterized by complex structure, large dip angle and poor post-stack 3D time-lapse imaging. Therefore, the 3D prestack time migration technique has been developed in this region. The basic principle and implementation process of 3D prestack time migration method are introduced. The application effect of this method in Hongbei area is analyzed. The comparison of prestack time migration profile and post-stack time migration profile shows that the imaging accuracy of seismic data has been greatly improved, the breakpoints are clear in the profile, the fault is clear, the characteristics of seismic wave group are obvious, and the degree of coincidence with the well is high.