震源车地震勘探技术在西安地裂缝勘探中的试验研究

Test Study on Application of Vehicle-mounted Vibrator in the Seismic Exploration of Ground Fissures in Xi'an

摘要:

为克服巨大的城市环境干扰,采集高质量的人工地震勘探数据,将大吨位震源车引入到西安地裂缝人工地震勘探中,并在真实城市道路环境下对已知地裂缝进行多项试验,包括抗干扰效果、勘探深度、震源工作参数、垂直叠加次数、不同主频检波器接收、勘探排列长度、最佳反射波接收窗口等,最后将人工地震勘探结果与钻探结果进行验证对比。结果表明,大吨位震源车在实际道路干扰环境下可以得到理想的地震反射剖面,剖面中地裂缝异常明显,推测解释的地裂缝在地面的位置可信。

Abstract:

To obtain high quality data in seismic prospecting for ground fissure exploration in Xi'an, it is necessary to determine ways of overcoming interference from the city environment. In this respect, this study introduces application of a large-tonnage vibrator. A number of experiments were conducted using previously determined ground fissures in a city road environment, and the following were determined:the anti-interference effect, exploration depth, vibrator function parameters, vertical stack effect, different inherent-frequency geophone receiving effects, length of survey line, and the best reflection wave receiving window. Exploration results were verified using a geological drilling profile, and they show that by using a large-tonnage vibrator in city roads, it is possible to obtain an ideal seismic stack profile from the seismic reflection profile, thereby determining ground fissure abnormalities. In this way, the position of ground fissures can be interpreted by seismic exploration.