Analysis of geophone array method in low SNR complex area of Ordos Basin

In the northwest of Ordos Basin, there is serious random interference in the complex area, which leads to the low signal-to-noise ratio of seismic data in this area. In order to solve the problem of low signal-to-noise ratio(SNR) of seismic data in this area, a method study of suppressing random interference by geophone array is carried. The influence of random interference on the accurate calculation of NMO correction and static correction, the suppression of interference wave by geophone array, the influence of intra group height difference and array base distance on high frequency of seismic acquisition data are studied, and the attenuation effect of geophone array internal distance on random interference is compared and analyzed. The results show that: in the area with low signal-to-noise ratio in the basin, the field geophone array mainly suppresses the serious random interference wave and improves the signal-to-noise ratio of seismic data; the height difference of geophone array less than 1 m has limited influence on the high-frequency components below 110 Hz of the seismic acquisition data in this area, and the base distance less than 13 m has limited influence on the frequency within 70 Hz of seismic data of medium and deep target layers; The random interference radius determined by theoretical calculation and experimental data is 1.7-2.0 m. the inner distance of geophone array larger than the random interference radius can effectively suppress the random interference wave, among them, the effect of the geophone group inner distance of 3 m is more stable. The results show that the method of geophone array receiving with the above parameters can improve the signal-to-noise ratio and frequency in the limited frequency band of 70 Hz, and the cost is relatively low. This conclusion has a guiding role in seismic exploration field acquisition in low SNR complex area of Ordos Basin.