新疆塔里木盆地大庆探区低信噪比地震资料处理技术

Processing techniques of low signal-to-noise ratio seismic data in Daqing prospect area,Tarim Basin, Xinjiang Region

大庆石油管理局物探公司研究所,大庆163357

Research Institute, Geophysical Prospecting Company, Daqing Petroleum, Administration, Daqing 163357

新疆塔里木盆地大庆探区位于巴东断陷构造带附近, 为沙漠覆盖区, 是塔里木盆地几个沙漠低信噪比地区之一。由于受地表和地震地质条件的限制, 野外采集的原始记录品质较差, 在记录上形成了很强的浅层折射、多次折射干扰、低频干扰和各种随机干扰。各类干扰波覆盖整张记录, 使有效反射波变成短反射波同相轴, 信噪比低, 是地震资料处理的主要障碍。本文列举大量的实际资料, 通过对静校正、去噪、DMO和偏移技术的研究, 总结出了一套适合于沙漠低信噪比资料的处理方法。

The Daqing prospect area of Tarim Basin, covered by deserts, is located near theBadong rift structure zone. It is one of the low S/N ratio areas in the basin. Due to the constraintsof surface and seismogeologic conditions, the raw data acquired in this area had a low quality, withstrong shallow refraction, multiple refraction, low frequency noise and various random noise onthe records. These make effective reflections scatter into short-range reflection events. The lowS/N ratio of raw data is a major obstacle to data processing. Based on the processing of largeamount of actual seismic data in this area, we carry out researches on techniques such as staticcorrection. noise removal, DMO, and migration, and sum up a set of processing techniquessuitable to low S/N ratio seismic data in desert areas.