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本文通过东濮凹陷开展的地震野外工作方法试验,总结了一套适合该区的最佳激发、接收系统方案: 1.最佳激发深度的选择要考虑表层结构中虚反射的滤波特性。试验表明,在该区表层结构条件下,随着激发井深的加大,地震波的频谱变窄,低频成分突出,高频成分相对减弱,一般选在11～20米为宜。 2.最佳接收系统要考虑地层和接收系统的滤波特性。试验表明,在井深18米激发地震波,采用SJ-1型检波器为宜;在井深27米激发,采用GSE-201型检波器为宜:在采用4.5米×5的浅井组合条件下,也要使用SJ-1型检波器才能得到较好的效果。
In this paper, a series of experiments on seismic fieldwork carried out in Dongpu Depression are summarized, and a set of optimal excitation and receiving system scheme suiting this area is summarized: 1. The selection of the optimal excitation depth should consider the filtering characteristic of the virtual reflection in the surface structure. Experiments show that with the increase of excitation depth, the spectrum of seismic wave becomes narrower, the low frequency component is prominent and the high frequency component is relatively weakened under the surface structure conditions of this area. Generally it is suitable to be between 11 and 20 meters. 2. Optimal receiving system to consider the stratification and receiving system filtering characteristics. Experiments show that it is suitable to use the SJ-1 type geophone to excite seismic waves at a depth of 18 meters and GSE-201 geophones at a depth of 27 meters to stimulate the seismic waves. In the case of 4.5 meters × 5 shallow wells, Use SJ-1 type detector can get better results.