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在大西洋沿岸平原地区,用VPI和SU可控震源记录而得的数据,可用来探测浅层基底(200米)的可疑断层,说明可能掩盖所有反射严重的地滚波的存在。虽然,噪音问题是那样严重,但由于表层范围内的迭加平滑效应会使分辨率降低,为了避免这点,在表层记录的过程中就没有用迭加震源和(或)组合接收,而用可控震源的白噪化法(VSW)来压制那些大振幅噪音。在可控震源互相关之前,(VSW)法是以采用时变能量比例,因此可发现,常规自动数字增益控制对此用途来说,是很有效的。在互相关时出现按预期的增益,所以这
Data recorded with VPI and SU vibrators in the plains of the Atlantic Coast can be used to detect suspicious faults in shallow basins (200 m), indicating the potential for masking all ground-roll events that reflect heavily. Although the noise problem is so serious, the resolution is reduced due to the superficial smoothing effect in the surface layer. To avoid this, the superposition of the source and / or the combination is not used during surface recording, Vibrator white noise (VSW) to suppress those large-amplitude noise. Prior to cross-correlation of vibrators, the (VSW) method employed a time-varying energy ratio, so that conventional automatic digital gain control was found to be very effective for this purpose. The expected gain appears in the cross-correlation, so this