可控震源在地震勘探激发条件复杂地区的应用

甘肃张掖平山湖矿区浅表层地震勘探地质条件复杂。利用可控震源激发,从能量、信噪比、频率等方面对试验资料进行定量分析,确定适合该区可控震源施工参数:震动台次、扫描长度、扫描频率、震源出力;针对可控震源地震资料特征,着重研究弱化初至前干扰、采取提高初至波信噪比等方法,使得单炮初至更加容易识别;同时,采用反褶积增宽频带,从而提高地震剖面分辨率,取得了较好的地质效果。

Application of vibrator in the region with complex seismic excitation conditions

The seismic geological conditions of shallow strata and surface are complex in Pingshanhu mining area, Zhangye, Gansu, the vibrator was used to carry out excitation, quantitative analysis was conducted for test data from energy, SNR and frequency to determine the operation parameters (vibration times, and scan length, scan frequency, source output) suitable to the area, aiming at the characteristics of seismic data of the vibrator, focusing on weakening interference before first arrivals, improvement of signal-to-noise ratio was made, making it easier to identify first arrivals of the single shot. At the same time deconvolution was adopted to widen the frequency band and enhance the resolution of seismic profiles, achieving good geological effect.