可分面元三维观测系统浅析

Brief analysis on bin-divisible 3D geometry.

可分面元三维观测系统可在较大道间距和激发点距条件下形成"子面元"(小面元),但可分面元三维观测系统会造成相邻面元最小炮检距增大、方位角分布不均,甚至空间波场出现剧烈跳跃等问题,影响地震数据采集效果。针对上述问题,通过2个实例,阐述了两种可分面元三维观测系统(奇偶三维观测系统和面元细分三维观测系统)"子面元"形成原理,分析讨论了产生上述问题的原因及其对资料品质的影响,认为可分面元三维观测系统在小投入情况下不可能得到好的应用效果。

The bin-divisible 3D geometry can produces‘sub-bin'(small bin) by adopting a bigger group interval and shot point interval, while may leading to some problems,including minimum offset between adjacent bins increasing,the distribution of azimuth non-uniform, even the spatial wave field appearing intense skipping,etc, which impacts the seismic data acquisition result.Aiming at above problems,by using two examples,we describe the forming principles of‘sub-bin'in two bin-divisible 3D geometry(including odd/ even 3D geometry and bin-subdivision 3D geometry),analyze the reasons for causing the above problems and their influence on data quality.The result shows that bin-divisible 3D geometry cannot obtain good effect with less investment.