利用叠前Kirchhoff积分偏移识别小断裂与低幅度构造

利用常规地震剖面精细解释小断层和低幅度构造存在较大困难.本文利用纵波和横波速度模型对采集得到的二维地震数据进行叠前Kirchhoff积分偏移得到纵波和转换横波深度和时间剖面，根据不同分量的深度和时间剖面联合解释小断层与低构造.深度剖面克服了时间剖面受地层厚度和地层速度共同制约的缺点，有利于识别低幅度构造.纵波（P）剖面与转换横波（PS）剖面相比有利于识别层间小断裂.我们对准噶尔盆地实际地震资料的处理和解释证实了这些优点.

The identification of small faults and low-amplitude structures by utilizing prestack Kirchhoff integral migration

It is very difficult to interpret small faults and low-amplitude structures using the conventional seismic section.In this paper,both compress wave(P) and converted shear wave(PS) velocity models are applied in prestack Kirchhoff migration to process 2D seismic data and gained P wave and PS wave time and depth sections respectively,which are then used to interpret low-amplitude structures and small faults.The depth section overcomes the shortage of the time section,which can be influenced by the thickness and velocity of layers jointly,and shows the thickness of strata distinctly.PS section has more advantage over P section in identifying small faults.These merits are verified by our processing and interpretation of the seismic data in Zhungaer basin.