利用共偏移距共反射面元叠加提高叠前地震资料质量  

Prestack seismic data enhancement with common-offset common-reflection-surface stack

作　　者：李栋 李振春 孔雪 熊宇 孙小东 

机构地区：[1]中国石油大学地球科学与技术学院,山东青岛266580 [2]中国石油川庆钻探工程有限公司测井公司,重庆400021

出　　处：《中国石油大学学报（自然科学版）》2012年第2期76-80,共5页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家'973'课题(2007CB209605);国家'863'课题(2009AA06Z206)

摘　　要：提出利用部分共偏移距共反射面元(CO CRS)叠加提高稀疏低信噪比叠前地震资料质量。通过多参数的COCRS旅行时公式计算得到部分叠加的CRS超道集,对数据进行规则化,以利于以后的常规处理如速度分析、叠前偏移等。模型试算和实际资料处理结果表明,与原始地震数据相比,对经过部分CO CRS叠加处理后的叠前数据进行偏移,不仅提高了偏移剖面的信噪比,同时改善了同相轴的连续性,获得了较好的成像结果。A partial common-offset common-reflection-surface（CO CRS） stacking method was developed to enhance the quality of sparse low fold prestack seismic data.A multi-parameter CO CRS traveltime formula was applied to compute partial stacked CRS supergathers,and the data were regularized by filling the gaps in cases of missing traces compared with original CMP gathers.These improved prestack data which can be used in many conventional processing steps including velocity analysis or prestack migration instead of the original data.The model test and practical data processing results show that compared with the image section obtained from the original seismic data,the image section by the application of migration with the prestack data obtained through partial CO CRS stack improves not only the signal-to-noise ratio but also the continuity of reflection event,which has better imaging results.

关 键 词：地球物理勘探 地震资料 共反射面元(CRS)叠加 共偏移距共反射面元(COCRS) 共反射面元(CRS)超道集 数据规则化 

分 类 号：P631[天文地球—地质矿产勘探]