地震叠前深度偏移方法流程及应用

A METHODOLOGY FOR SEISMIC PRESTACK DEPTH MIGRATION

针对复杂介质的成像问题，提出了一套地震资料叠前深度偏移方法流程，主要包括三部分：（１）地震资料精细预处理；（２）速度－深度模型建立；（３）叠前深度偏移成像．以Ｋｉｒｃｈｈｏｆｆ偏移理论为基础，强调地质与地球物理的综合以及地震处理与解释的一体化．在ＺＸ地区成功地实现了二维地震资料叠前深度偏移，所获得的ＮＥ２０６叠前深度偏移剖面揭示了复杂的ＺＸ古潜山及其内部构造，并清楚地展示了逆掩断层的存在．

A methodology for seismic prestack depth migration, which is based on the Kirchhoff's migration theory and combined with regional geological model, is proposed in this article. The flow chart of this approach includes three main parts: (1) seismic data preprocessing,(2) velocity-depth model building, and (3) prestack depth migration and imaging. An example over the complicated structural zone of the ZX paleozoic buried hill in eastern China is given here; and the result of prestack depth migration, i. e. NE206 seismic Profile, shows the top and inside structures of the ZX buried hill and overthrusts more clearly comparing with poststack migration data.