面向目标与成像的海上多方位观测系统的评价与优化

Marine multi-azimuth geometry evaluation and optimization for target-oriented illumination and imaging

针对南海深水区崎岖海底、陡坡带、断裂带和较大向斜、背斜构造下的地震成像模糊问题,开展面向目标照明和成像的多方位采集设计评价和优化研究。主要采用正演模拟、照明分析及偏移成像等多项技术对观测系统做精细评价和优化;综合考虑采集成本、施工难度、数据处理及成像效果等因素,认为沿0°、90°、120°和150°等4个方位的多方位观测系统为最佳;建立了一套完整、有效、适用于海上多方位观测系统评价的方法和流程,有利于实际海上复杂区地震数据采集。

In South China Sea,rugged and steep seabed and complex subsurface such as fault,syncline and anticline cause obscure seismic imaging.In this paper we propose a multi-azimuth geometry evaluation and optimization approach to deal with this issue.Aiming at targets,we use forward modeling,illumination,and migration imaging to evaluate and optimize acquisition geometry.In consideration of acquisition cost,operation efficiency,and data imaging,we put forward an optimized geometry with 4azimuths,which are 0°,90°,120°,and 150°.The proposed approach provides an effective way for marine seismic geometry evaluation and optimization.