大吨位可控震源在西部巨厚砾石区地震勘探中的应用

在潜水位较深、巨厚砾石覆盖区，如何提高激发效果是煤田地震勘探面临的最大难题。通过对炸药震源及中小吨位、大吨位可控震源的对比，认为可控震源具有激发精确可控、效率高等优势；而大吨位可控震源又具有能量大、技术参数可控、震源一致性高等优点，尤其适合在中国西部地区巨厚砾石区的地震勘探。甘肃某勘探区震源的试验对比与煤田勘探效果说明，在反射品质较差的巨厚砾石区，只有使用大吨位可控震源，才能取得高品质的地震资料。

Application of Large-tonnage Vibrator in Western China Extremely Thick Gravel Area Seismic Prospecting

In areas with deeper groundwater level, and extremely thick gravel cover, how to improve shooting effect is an essential difficult problem confronted in coal seismic prospecting. Through contrast of explosive source and medium, small and large-tonnage vibratory sources, considered that the vibratory sources have advantages of precise, controllable shooting and high efficiency; while large-tonnage vibrator has predominance of large energy, controllable technical parameters, high consistency, is especially propitious to seismic prospecting in the western China extremely thick gravel areas. Sources testing and contrast in a Gansu prospecting area and coal exploration effect demonstrated that, in extremely thick gravel area with relatively poor reflection quality, only the large-tonnage vibrator can get high quality seismic data.