由宽角反射地震资料重建壳幔反射结构的相似性剖面

RECONSTRUCTION OF THE SEMBLANCE SECTION FOR THE CRUST AND MANTLE REFLECTION STRUCTURE BY WIDE-ANGLE REFLECTION SEISMIC DATA

针对人工源宽角地震测深中炮点与接收点稀疏的特点 ,利用几何散射理论进行壳幔散射体的相似性剖面成像 ,利用互易性原理计算散射体相似性成像的时间条件 ,研究基于宽角反射地震资料重建壳幔反射结构的相似性成图方法 .其中 ,成像点的时间采用快速、高精度的程函方程求解技术 .利用该方法处理东南陆缘区宽角反射剖面实际资料 ,结果表明 ,较之壳幔反射结构的CDP成图技术 ,相似性成图方法具有提高反射同相轴横向连续性的能力 .

Since the shots and receivers are sparse in active wide angle seismic exploration, we use wide angle reflection seismic data to reconstruct the semblance section of reflection structure in the crust and mantle based on the diffraction theory. The travel time conditions for reconstructing the semblance section are calculated using the reciprocity principal, and the travel time field from shots and receivers are computed using Eikonal solvers which have the advantage of high efficiency and accuracy. The results from processing real wide angle reflection seismic data in southeastern China showed that this method can improve the horizontal consistency of reflection events compared with CDP mapping.