观测系统类型及参数对采空区探测的影响

THE INFLUENCE OF THE TYPE AND PAREMETERS OF THE RECODING GEOMETRY ON GOAF DETECTION

常规煤田三维地震勘探观测系统设计时着重于节约采集成本,提高施工效率,往往使用窄方位半束线横向滚动的观测方式,但是对于需精细勘探、采空区发育不规则的矿区,窄方位观测系统对勘探效果的影响还有待分析。笔者采用三维射线追踪算法对采空区进行了正演数值模拟分析,并对不同观测系统在采集脚印、方位角分布、目标采空区的照明度等观测效果进行了深入对比。六种观测系统、九种属性分析结果表明,宽方位45°斜交式观测系统在五个方面都具有较强优势,对采空区地质目标的异常响应最好。

The design of conventional coal mine three-dimensional seismic exploration observation system focuses its attention on saving acquisition cost and improving efficiency of construction, and hence often uses narrow azimuth half beam line horizontal scrolling obser- vation way ;nevertheless ,for coal mine fine structure exploration in irregnlarly-developed goal, the prospecting effect remains doubtful. On the basis of the ray tracing algorithm for three-dimensional goal numerical model forward based on an analysis of the observation effects of different observation systems in such aspects as acquisition of footprints, azimuth distribution, and target goat＂ lighting degree, the authors carried out detailed comparison. The analytical results of six kinds of observation systems and nine kinds of attributes show that the wide azimuth 45 o oblique type observation system has obvious advantages in five aspects, and its anomaly response to the geo- logical target of the goal is the best.