变速成图技术在库车坳陷亚肯北地区的应用

Application of Velocity-Varied Mapping Technique to Yakenbei Area in Kuqa Depression of Tarim Basin

库车坳陷亚肯北地区地表起伏大,深层特殊岩性地质体分布不均,制约了该区的圈闭落实。常规的圈闭研究均在固定基准面地震数据下开展,而复杂地区基于固定基准面的地震预测深度与实钻深度误差较大,为此,在研究区开展了基于浮动基准面的变速成图技术研究,其结果表明,相对于固定基准面而言,该方法大大地提高了地震预测精度,为复杂地区圈闭研究提供了有力的手段。

Yakenbei area in Kuqa depression is characterized by high-relief,non-homogenous distribution of deep geological body with special lithology and complicated geologic conditions in surface and subsurface.They are the main reasons for influencing velocity analysis and the trap-scale determination in this area.The conventional research of trap study by seismic data is based on the fixed datum,but the errors between forecast depth by seismic data and actual drilled depth are normally big.So,the velocity-varied mapping technique based on the floating datum in this area is proposed and carried out.The result indicates that the predicted precision by this method is much higher than that by using fixed datum,providing powerful tool for trap study of complex areas.