由于目的层反射弱、多次波发育，地震资料品质差，为此二次三维采集时选择了近似全三维的观测系统；
The quality of seismic data was poor because complex and special geological conditions make the reflectivity of the objective formations weak and multiples strong.
鉴于三维三分量的野外作业更加复杂，采集成本更高，因此野外采集地震观测系统的优化分析更为重要。
In view of more complexity in 3-D, 3-C seismic field operation and high cost of acquisition, the optimum analysis of seismic field acquisition geometry is more important.
三维地震勘探观测系统的模式较多，以常规束状观测系统的应用较为广泛。
There are many modes of field setup in the3-dimensional seismic prospecting, and the conventional bunched field setup is applied more widely.
三维地震勘探观测系统的模式较多，以常规束状观测系统的应用较为广泛。
There are many modes of field setup in the3-dimensional seismic prospecting, and the conventional bunched field setup is applied more widely.
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