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中国西部复杂山地是地震勘探的难点区域,地表和地下都复杂,从而导致地表激发困难,地震资料干扰严重、信噪比低。地下构造形态复杂,导致反射点分散严重,前人尝试过弯线采集,但很少考虑地下实际构造特征。本文章提出基于CRP的不规则采集设计方法,使地表避开难以激发的区域,地下考虑构造特征及CRP点分布位置,优化地表接收线位置,通过地表有目的布置接收点位置,最大程度的保证地下CRP点不分散,从而提高地震数据的信噪比.并以四川盆地某工地的实际资料通过模型数据验证了方法的合理性与可行性。表明该方法能够解决复杂地区地震采集存在的部分难题,为复杂地区的地震勘探采集提供一个新的思路。
Complicated mountainous areas in western China are the most difficult areas for seismic exploration. Both the surface and the underground are complicated. As a result, it is difficult to stimulate the earth’s surface, the seismic data is seriously disturbed and the signal-to-noise ratio is low. Complex underground structures, resulting in reflection points scattered serious, previous attempts to capture the bend line, but rarely consider the actual underground structure. In this paper, an irregular acquisition design method based on CRP is proposed, which makes the surface avoid the hard-to-stimulate area. Considering the tectonic features and location of CRP distribution underground, the location of surface receiving line is optimized. The underground CRP points are not scattered, so as to improve the signal-to-noise ratio of seismic data.According to the actual data of a construction site in Sichuan Basin, the model is used to verify the rationality and feasibility of the method. It is shown that this method can solve some of the problems of seismic acquisition in complex areas and provide a new idea for seismic exploration acquisition in complex areas.