摘要
对偏移算法进行了简要回顾,提出对偏移结果产生影响的因素除偏移算法、速度场的准确程度和地震资料的品质之外,还应包括道间距及采样率等。指出道间距过大对偏移结果的影响主要是导致空间假频现象的出现,偏移速度场难以准确建立,偏移横向误差大及偏移信息量少,这些影响与具体偏移算法无关。应用理论模型及实际资料对上述结论进行了验证。根据验证结果,建议在野外施工设计过程中．应根据勘探目的不同、地下构造的复杂程度及勘探精度,并考虑道间距对偏移结果的影响,合理地设计道间距。
This paper briefly reviewed different migration algo- rithms,and pointed out that group interval and sample rate are two major factors affecting migration results besides migration algorithms,velocity field,and seismic data quality.The effects of group interval on migration lie in 4 aspects,including the presence of spatial aliasing,construction of accurate velocity field,lateral migration error,and lack of amount of migration information.These aspects are related to particular migration algorithms adopted.The results were demonstrated by model and real data.It is suggested that group interval be determined according to the survey targets,subsurface structures,and the effects of group interval to migration.
出处
《勘探地球物理进展》
2007年第1期33-38,共6页
Progress in Exploration Geophysics
关键词
道间距
空间假频
偏移速度场
横向计算误差
偏移信息量
migration
group interval
spatial aliasing
migration velocity field
lateral precision
lateral calculation error
amount of migration information
