强噪声环境条件下的浅层地震勘探方法研究

Shallow subsurface seismic prospecting methods in high-noise condition

常规方法产生的地震记录难以在提高记录频率成分的同时提高记录的信噪比.而用Mini-Sosie方法产生的地震记录具有较宽的频率范围;同时,由于激发过程为一持续过程,可通过长时间持续激发产生的记录进行相关叠加后得到较强的信号,在持续激发的过程中,由于随机噪声在随地震波传播的过程相互干涉,可在很大程度上压制随机噪声,从而使得地震记录具有较高的信噪比,这可在一定程度上解决常规地震勘探中提高记录主频而降低记录信-噪比之间的矛盾.

Conventional methods which stimulate seismic records cannot increase frequency components and improve signal-to- noise ratio at the same time. The Mini-Sosie methods which stimulate seismic records have a wide frequency range. Its exciting process is continuous and through prolonged exploding seismic records to correlate to gain the strong signal. In the continuous stimulating process, due to random noises which interfere each other in the seismic wave propagation,it can suppress random noise to a large extent, thus enabling the seismic records to have high signal-to-noise ratio. So,this can solve the problem that conventional seismic prospecting only increases seismic records the main frequency,but not improves signal-to-noise ratio to a certain extent.