复杂条件下煤田三维地震勘探应用实例

A Case Study of Coalfield 3D Seismic Prospecting under Complex Conditions

勘探区地处毛乌素沙漠西南边缘,表层多为干燥疏松的沙丘和黄土;浅层为沙土、卵石、砾石层,大部分地段不含水,均为松散沉积物。区内断层和褶皱发育,煤层埋藏深度与产状变化较大。针对该区表、浅层和深层复杂的地震地质条件,通过不断优化三维地震勘探设计,最终确定了野外数据采集观测系统及激发与接收参数,并在数据处理中,选择了合适的处理技术、处理参数及处理流程,获得了信噪比与分辨率较高的三维数据体,较好的完成了地质勘探任务。

The prospecting area is situated at the southwestern margin of Mu Us desert.On the surface is mainly dry and loose sand dunes and loess,near-surface is sand,pebble and gravel layers,mostly not water-contained loose sediments.Coal seams as the prospecting target,their buried depths and occurrences change abruptly,and faults and folds are well developed.In allusion to complex surface,near-surface and deep seismic-geologic conditions,through optimizing 3D seismic prospecting design constantly,finally have determined field data acquisition and observation systems.During the data processing,appropriate technology,parameter and procedure have been selected,thus the 3D data volume with high signal-noise ratio and high resolution obtained,prospecting task is finished preferably.