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经典的组合理论主要偏重于论述对各种干扰波的压制能力,而较少研究对有效反射波的压制及改造作用。本文的做法是把组合与地下反射层深度、倾角、接收信号频率、速度规律以及不同观测系统、初至切除等因素作全盘考虑,并从一些典型盆地有代表性的速度模型出发,作了某些理论计算和实例分析,得到了一些有益的结论,绘制了一套便于野外施工选择组合基距的图板。最后指出了克服组合效应的三条途径:①单个检波器多道接收;②去组合效应反褶积,③宽通的“理想”检波器串。
Classical combinatorial theory mainly focuses on the repression of various types of interfering waves, and less studies on the repression and transformation of effective reflected waves. The approach in this paper is to consider the factors such as the depth and dip angle of the reflector, the frequency of the received signal, the velocity, the observation system, and the initial excision. Considering the representative velocity models in some typical basins, Some theoretical calculations and case studies have yielded some useful conclusions and drawn a set of planks that can be used to facilitate the selection of base combinations for field construction. Finally, it points out three ways to overcome the combinatorial effect: ① multiple receivers for single detector; ② deconvolution to combinatorial effect; and ③ “ideal” detector strings for wide pass.