内蒙古阿拉善高放废物地质处置预选场址近地表花岗岩体地震成像

Seismic Imaging of Near-Surface Granite in Alxa Potential Site for High-Level Radioactive Waste Disposal

在内蒙古阿拉善高放废物地质处置预选场址采用高分辨多次覆盖反射波法与初至波旅行时层析反演相结合的地震勘探技术,跨目标岩体完成了2条总长度约27km的地震探测剖面。获得的地震探测成果揭示了目标岩体的空间展布、南侧不整合边界、岩体内部结构,尤其是断裂构造的存在情况和产状特征,对岩体南侧中新生代盆地内部的断裂和不整合地层接触关系也有清晰的反映。

We utilize the technology of high-resolution multiple coverage reflected wave method com- bined with first-arrival travel-time tomography inversion in one potential site for high-level radioactive waste disposal, at Alxa, Inner Mongolia. Two seismic profiles, whose total length is about 27 kilo- metres, are carried out across the target rock. The results of seismic detection reveal the spatial distri- bution, the south side unconformity boundary, and the rock＇s inner structure, especially the internal faults, of the target rock. The fault structures and non-conforming strata contact relations in the inte- rior of the mesozoic-cenozoic basin, which are located on the south of the target rock, also are clearly reflected. The seismic exploration work with large high-velocity rock as detecting target is infrequent.