科研之友
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摘要
The pattern of seismic source excitation is one of the main factors to influence the quality of seismic data acquisition. Based on the method of finite difference numerical simulation, we carried our forward modeling on four typical excitation means, including elongated dynamite source, time-lapse dynamite source, facies-controlling dynamite source and horizontal array source. Theoretically, the wavefield characteristics and energy illumination figures of different excitation patterns under the circumstance of same dynamite charge are studied and analyzed. The comparison and analysis on simulation results show that along with the shots increasing, the energy of seismic wavelet shooting by array source and facies-controlling source is more accumulated, which is beneficial for the exploration on deep layers. Moreover, time-lapse source has orientation capability. However, the energy diffuses to the two sides as columnar source shooting, which is not beneficial for the exploration of deep layers. For horizontal layers, time-lapse source shooting has worse effect than array source, but can increase the base interval of time-lapse sources to improve the orientation capability and strengthen the down-going energy propagation. In actual application, we should select the shooting means in terms of area geological conditions and seismic acquisition cost. But for dip layer, array shooting is better than lapse shooting, and the facies-controlling shooting is best. As a conclusion, facies-controlling source shooting is suggested for the dip formation, especially for the high-dip formations.
- 出版日期2013
- 单位中国石油大学（华东）
