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野外干扰波调查是指导正确选择野外采集参数的重要手段 ,直接影响采集数据的质量。本文采用方形排列干扰波调查方法 [1]对西藏工区的实际数据进行了分析和研究 ,得知在高速层出露地区干扰波速度范围是 30 0 0～ 4 70 0 m/ s。其中速度小于 350 0 m/ s的干扰波可通过野外组合有效压制 ;而速度大于 4 0 0 0 m / s的干扰波则很难压制 ,且其方向决定于周围高速层出露的形态。此外 ,由于地层倾角陡 ,反射波也存在一定的方向特性。因此在这类地区作数据采集时 ,采集参数要随地表高速层出露的形态和反射层的陡度而改变。此次研究结果表明 :方形排列干扰波调查方法与其它观测方法相比 ,能更准确地求取干扰波速度、方向 ,而且还具有求取信噪比的独特功能。
Field interference wave survey is to guide the correct choice of field acquisition parameters an important means of direct impact on the quality of collected data. In this paper, the square array of interfering wave survey method [1] was used to analyze and study the actual data of Tibet work area. The result shows that the interfering wave velocity in the exposed area of high-velocity layer is 30 0 ~ 4 70 0 m / s. Among them, the interference wave whose speed is less than 350 0 m / s can be effectively suppressed by field combination; while the interference wave whose velocity is more than 4000 m / s is hard to be suppressed and its direction depends on the appearance of the surrounding high-speed layer. In addition, due to the steep dip of the formation, the reflected wave also has certain directional characteristics. Therefore, in this area for data acquisition, the acquisition parameters to change with the appearance of high-speed surface layer and the steep gradient reflection layer. The results of this study show that compared with other methods, the method of square array of interfering waves can obtain the interfering wave velocity and direction more accurately, and also has the unique function of obtaining signal-to-noise ratio.