三维观测系统聚焦性能分析技术及应用

Focusing performance analysis of 3-D seismic geometry and its application

中国石油化工集团公司中原石油勘探局地球物理勘探公司,河南濮阳457001

Wan Xuejian,Geophysical Prospecting Company,Zhongyuan Petroleum Exploration Bureau,Puyang 457001,China

三维观测系统聚焦性能分析是一种应用共聚焦理论(common focus point,CFP)进行三维地震采集观测系统设计评价的方法，通过对检波点与震源点进行聚焦成像,进而分析观测系统聚焦成像的分辨率和清晰度，指导观测系统设计。分析了三维观测系统的面元大小、覆盖次数、排列长度、检波点远近等因素对聚焦分辨率和聚焦清晰度的影响,从整体上评价了观测系统聚焦性能,为采集的资料具有最佳叠前偏移成像效果提供了保证。马场实际资料处理分析结果与应用聚焦性能分析技术分析的结果十分吻合,说明三维观测系统聚焦性能分析技术是科学合理的,可以用来指导观测系统设计。

Focusing performance analysis of 3-D seismic geometry applies common focus point (CFP) theory to carry out geometry design and evaluation.By focusing imaging on shot points and receiving points,the resolution and clarity of focusing imaging is analyzed to guide geometry design.After analyzing the impact of bin size,fold,array length and the distance of receiving points on focusing resolution and clarity,the focusing performance of geometry was evaluated,which guarantees the quality of acquisition data for achieving best prestack migration result.The actual data processing result of Machang area is matched well with the achievements of focusing performance analysis,which proves that focusing performance analysis of 3-D geometry is reasonable and can be used to guide geometry design.