VSP旅行时反演应用于VSP-CDP转换

VSP Traveltime Inversion Applied in VSP-CDP Conversion

非零偏移距垂直地震剖面(VSP)模型的制作是非零偏移距VSP资料处理的关键环节之一,是VSP-CDP转换的基础。本文试用旅行时反演修正非零偏移距VSP的模型,以加速模型的制作过程,提高非零偏移距VSP的处理速度。用合成VSP资料试算表明:旅行时的随机误差对模型的制作影响不大;只要能较准确地确定界面位置,用旅行时反演修改制作非零偏移VSP模型是可行的。本文还探讨了初始模型的不同选择方法,并将旅行时反演用于实际VSP资料的处理。结果表明,大大地节省了非零偏移距VSP资料的处理时间。

An important step in processing offset vertical seismic profiling (VSP) data is to set up a model (offset VSP model), which is essential to VSP-CDP conversion. It is attempted in this paper to speed up the processing of offset VSP data by using an offset VSP model with traveltime inversion. Test on synthetic VSP record data demonstrates the feasibility of establishing and modifying the offset VSP model with traveltime inversion so long as the error is small. The random error of traveltime has little influence on the model. The determination of initial models is also discussed in this paper.