深度域地震资料若干问题初探

Discussion on seismic data of depth domain

中国石化胜利油田物探研究院,山东东营 257022

Geophysical Research Institute,SINOPEC Shengli Oilfield Company Limited, Dongying 257022, China

随着VSP、深度偏移、井间地震等物探新技术的出现,深度域地震记录的应用日益增多。从时间域和深度域的地震波场描述出发,对深度域的子波、褶积和Fourier变换等基本问题,进行分析探讨。证明了时间域与深度域中的地球物理概念、原理和方法是相互联系的,其数学表达方式是相似的。对深时转换中采样间隔的选择、频率谱与波数谱数据的关系和深时转换剖面上视频率变化等实际问题,给出了合理的解释。

Seismic data of depth domain has been applied widely along with the development of new geophysical technologies such as VSP, depth migration, crosswell seismic. Based on the description of seismic wave field in time domain and depth domain, this paper discusses basic problems in depth domain such as wavelet, convolution, Fourier transform. It is showed that the geophysical concepts, principles and methods are connected in time domain and depth domain, and the mathematic expressions are similar. Practice issues such as sampling in depth-time conversion, the relationship between frequency spectrum and wave-number spectrum data, the change of apparent frequency on depth-time conversion section are also discussed.