城区特大型障碍物变观三维观测系统设计及应用——以德阳三维为例

Design and its appplication of variable 3D seismic geometry in oversize obstacle in urban area——taking Deyang 3D as example

在过德阳城区的地震勘探施工中,采用多种技术相结合的变观设计方法,在城区加密接收线和使用固定排列,城区周边根据"束内调整"和"束间调整"相结合的原则进行炮点布设,并对观测系统进行反复调整和属性分析,设计出适用的变观方案,弥补炮点不足造成的小炮检距缺失。同时采用新设备,压制城区内的部分环境噪声,取得较好的地震采集效果。

During seismic survey in Deyang urban district, variable survey design method, which is a multi - technologies combined method,was used. By infilling receivers lines and use of invariable geometry layout and adjusting the shots in swaths and between swaths around the urban districts, an optimal variable seismic geometry was designed after the adjustment and analysis of its attribute. Missing short offsets can be partly complemented because of shortage of shot points in urban area. Some environmental noises were suppressed by newest device. High quality of data acquisition was obtained.