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目前,叠前时间偏移处理技术广泛应用于油气田的地震勘探资料处理中,影响叠前时间偏移成像的最主要因素就是数据品质。四川盆地东部地区由于地表条件复杂,资料噪声较重,野外采集通常采用变化的观测系统施工,部分地段炮检距分布非常不均匀,造成资料品质不能满足叠前时间偏移的需要。通过对川东地区一条二维测线叠前时间偏移成像效果的试处理分析,总结出一套提高叠前时间偏移成像质量的技术方法,即利用偏移前道集去噪技术,提高道集资料信噪比;运用道内插技术,改变由于野外施工造成数据分布不均的现象。最终使得数据品质能够满足叠前偏移处理的条件。
At present, the prestack time migration processing technology is widely used in the seismic exploration data processing of oil and gas fields. The most important factor affecting prestack time migration imaging is the data quality. Due to the complex surface conditions and heavy data noise, the eastern part of Sichuan Basin is usually constructed with varied observation systems. The distribution of offset in some sections is very uneven, which makes the data quality unable to meet the need of prestack time migration. Through a trial analysis of a two-dimensional prestack time migration imaging effect in the eastern Sichuan area, a set of techniques to improve the imaging quality of the prestack time migration are summarized. By using the offset front gathers de-noising technology, Road set information signal to noise ratio; the use of Road interpolation technology to change due to field construction caused by uneven distribution of data phenomenon. Ultimately, the quality of the data can satisfy the pre-stack migration conditions.