垂直地震剖面与地面地震联合成像方法

垂直地震剖面(VSP)观测是在井中布置检波器,观测系统有别于地面地震,观测的波场特征也有别于地面地震。利用分步Fourier法外推波场,并在每一个外推深度叠加该深度的观测波场,实现了VSP与地面地震观测数据的联合成像。不同观测系统所获得的波场在成像过程中可以优势互补,提高成像质量。模型试算表明,VSP与地面地震数据的联合,对地层能够更为准确地成像。

Composite Imaging of VSP with Surface-Seismic Data

VSP observation system is different from surface seismic prospecting, including geophone arrangement and wave field feature, etc. Split-step Fourier method is used to extrapolate wave field and stack observational wave field at every extrapolation step, by which the integrated imaging of VSP with surface seismic data is gained. The wave fields given by different observation systems can compensate each other in the process of imaging, thus improving the quality of imaging. The theoretical models show that integration of VSP with surface seismic data can make more precise imaging of studied strata.