基于叠前偏移的观测系统优化设计及应用效果

Geometry optimization design and application effect based on the prestack migration

叠前偏移对观测系统有着较强的依赖性,属性好的观测系统可以有效提高叠前偏移成像效果。但目前高精度地震勘探中基于叠前偏移成像效果的观测系统设计以及论证方法较少。为此,介绍了基于叠前偏移成像效果的观测系统设计方法,即通过分析观测系统道距、炮点距、接收线距、炮线距、最大跑检距选择对叠前偏移成像效果的影响,利用双聚焦、叠前偏移响应、采集痕迹分析等技术,合理选择观测系统参数。应用该方法在胜利探区史南(SN)工区取得了良好的采集效果。

Prestack migration strongly relies on the geometry,and the geometry with good attributes can effectively improve the result of prestack migration.However,at present,there are few geometry design and demonstration methods based on the pre-stack migration imaging effect in the high-precision seismic exploration.Therefore,we introduced the geometry design method from the requirements of pre-stack migration imaging.Firstly,we analyzed the impact of the selection of geometry parameters(such as trace distance,shot point distance,receiving line distance,shot line distance and maximum offset) on pre-stack migration.Then,double focusing,pre-stack migration response and foot print analysis technology were utilized to reasonably select geometry parameters.The application of the method acquired good result in the Shinan block of Shengli exploration area.