Application of Super-Trace Residual Statics Technology in Sichuan Dual Complex Low SNR Seismic Data

Eleven oil and gas reservoirs formation during the Sinian - Jurassic period have great reserves in the northeast area of Sichuan Basin, and the DS survey of Yilong - Pingchang area is a block with great exploration potential. DS 3D seismic survey is located in the mountainous surface situation is very complex, the elevation difference of two detection points in adjacent 2 km is more than 1000 m, the underground structure undulating fault develops various disturbance wave fields complex, the statics problem is very prominent. The aim of this exploration is to identify the shallow channel of shallow Xujiahe formation, the statics problem of shallow thin layer of low SNR seismic data in double complex area must be solved before migration. By means of 3D Fresnel band chromatography statics correction technique, the continuity of the events in frequency band range of 8–28 Hz is improved. In order to solve the problems of low SNR and difficulty in velocity analysis, we use large-scale parameter denoising mesh speed analysis iteration to improve the accuracy of speed analysis, using the precise superposition speed using the super-trace residual statics technology, divided into three rounds gradually expand the data frequency band involved in the operation for residual statics processing. The final residual statics is less than ±0.5 ms, there is a significant improvement in the continuity of the events compared with the results of the previous treatment, the characteristics of vertical wave resistance are clearer, the resolution ability of small horizontal geological bodies is improved obviously than before, and the characteristics of channel in Xujiahe formation are easier to identify, which provides high quality results for seismic target exploration in Yilong - Pingchang area of Sichuan Basin.