利用近可控震源检波器资料提高单炮相关质量

可控震源地震采集是利用参考信号与母记录进行相关得到地震单炮记录,且两种信号相关性越强则相关结果越好。可控震源激发的参考信号通过震板振动传递给地表,因震板与地表存在耦合关系,导致震板激发振动信号与地表接收振动信号并不完全相等,故利用参考信号与母记录做相关难以得到最佳相关结果。基于此,提出一种利用距可控震源较近(约为15m)检波器记录到的地表振动信号与母记录进行相关的方法;经过实际资料验证,该方法可有效提高相关单炮记录的信噪比和分辨率。

Quality improvement of vibroseis shot records using near-vibrator detector signal

A vibroseis trace (shot record) is usually obtained by cross-correlation of the reference with a recorded signal. Normally better data will be obtained if these two signals are similar. However recorded signals are always different from the reference due to coupling between vibrator plate and the surface. So correlated traces cannot always be very good. For this reason, we propose to use a signal collected by a near-vibrator geophone (15 meters from vibrator) as the reference. Then this near-vibrator signal is correlated with a recorded signal. Field data acquisition shows that the proposed approach can significantly improve both signal-to-noise ratio and resolution of shot records.