部分共偏移距共反射面元叠加技术研究

Technical Study on the Partial Common-offset and Common-reflection-surface Stacking

共偏移距共反射面元(CO CRS)叠加由传统的零偏移距共反射面元(ZO CRS)叠加发展而来,其算子的有效范围更大,可以充分利用大炮检距信息对复杂地下构造进行成像。该次研究采用的参数分步搜素策略大大缩短了计算时间,有效解决了实现过程中计算效率较低的难题。利用部分CO CRS叠加对稀疏的低信噪比地震资料进行处理,不仅可以对数据进行规则化,补充缺失地震道信息,而且整体提高了资料的信噪比,这对于后面的常规处理比如速度分析、叠前偏移等,都是非常有利的,在模型试算中见到了明显效果。

Common-offset and common-reflection-surface(CO CRS) stacking was expanded from conventional Zero-offset common-reflection-surface(ZO CRS) stacking.The valid range of the stacking operator was wider and the better imaging of complex subsurface structures could be obtained with far-offset information.The parameter splitting algorithm used in this paper obviously reduced the calculation time of CO CRS stacking,which effectively resolved the difficulty of low computational efficiency in actual application.The partial CO CRS stacking method is used to enhance the quality of sparse low fold prestack seismic data,which is regularized by filling the gaps in cases of missing traces for improving signal-to-noise ratio.The improved prestack data can be used in many conventional processing steps,such as velocity analysis or prestack migration instead of the original data.Satisfactory results are obtained in the model test.