复杂多变条件下浅层三维地震勘探技术的应用

针对准格尔煤田南端矿区煤层埋深浅、地形复杂、厚黄土覆盖、地表障碍物稠密等不利于三维地震勘探的特点,采用小线距、小道距、高覆盖次数宽频带接收的常规三维观测系统和选择最佳的激发与接收位置的特殊三维观测系统的技术解决数据采集不全和资料不理想的地带,数据处理时采用折射波静校正、叠前三维地表一致性振幅解补偿、三维地表一致性反褶积和严细的三维切除处理等手段最大限度提高资料分辨率和浅层反射波的损失的问题。通过本次勘探进一步查明了测区内主要可采煤层的赋存形态和深度,新发现断层6条,查明了主要可采煤层风氧化带范围。

Application of 3D seismic prospecting technology in complicated condition

The southern part of Junggar coalfield is shallow,complex terrain,thick loess and many surface barriers.These characteristics are disadvantages for 3D seismic prospecting.Common 3D geometry with small line space,small trace interval,high fold times and broad band acquisition and special 3D geometry with optimized shot and receive points is adapted to cope with areas that are hard to acquire data or acquire high quality data.The prospecting identified the occurrence conditions of main coal seams,discovered 6 new faults and confirmed the weathered zone of main coal seams.