The study on vibrator seismic data acquisition and processing for sandstone type uranium prospecting in Erlian Basin

Abstract Seismic exploration technique has been widely used in sandstone-type uranium exploration in recent years. Aiming to the demands of sandstone type uranium prospecting in Erlian Basin, seismic geometry parameters are designed, and excitation parameters of high-precision vibrator are proved by field test. High quality raw seismic data are obtained. According to characteristics of vibrator seismic data, crucial data processing method and techniques are researched. The main processing techniques include tomographic static correction, pre-stack combination de-noising in different domain, surface consistent prediction deconvolution, surface consistent amplitude compensation, velocity analysis and residual static correction. The reasonable stack velocity model is established, and the stack section which has high signal-to-noise ratio is obtained. the stack velocity model is built as initial migration velocity model. After multiple iteration of migration velocity analysis and pre-stack Kirchhoff time migration, the underground target geological structure is reasonable imaged, and the true subsurface stratum distributing feature is obtained. Finally, the reasonable vibrator seismic data acquisition and processing techniques are built. The ultimate seismic section which has high resolution, clear wave group, reasonable stratum distribution feature is obtained, besides, the section provides reliable basis for subsequent seismic inversion, interpretation and favorable ore-forming sandstone prediction.