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目前地震勘探已大量使用多次迭加、多炮井组合和多检波器组合,简称“三多”。其实质就是通过不同方式的组合以达到提高讯噪比的目的。由于多次迭加是建立在野外原始记录基础上,所以它要求原始记录有较高的讯噪比。目前使用多炮井组合和多检波器组合就是为达此目的而采取的措施。而不同组合形式的效果也不一样。通常是在施工前利用组合方向特性曲线比较一下,选择较好的组合形式再到野外去试验。但是现在采用“三多”的情况下,再用过去简单的线性组合直接分组相加的方法来计算多炮井组合、多检波器组合的方向特性就很麻烦。如图1是由九个炮井菱形组合爆炸与15个检波器平
At present, seismic surveys have been widely used for many times, multiple well combinations and multi-detector combinations, referred to as “three more.” Its essence is through the combination of different ways to achieve the purpose of improving signal to noise ratio. Since multiple iterations are based on the original record in the field, it requires a higher signal-to-noise ratio for the original record. The current use of multiple gunhole and multi-geophone combinations is a measure for this purpose. The effect of different combinations is not the same. Usually in the construction before using the combination of characteristic curves to compare, select the better combination to the wild to test. However, when using “three or more”, the directionality of the multi-wave detector combination is very troublesome by calculating the multiple-well combination by using the simple linear combination direct grouped method in the past. Figure 1 is a combination of nine artillery hole diamond explosions with 15 detectors flat