Application of Three-source and Multi-cable High-density Seismic Acquisition for Gas hydrate in Offshore China

The gas hydrates has the characteristics of shallow burial depth and rapid lateral change. In order to accurately describe the boundary of gas hydrate bodies, the three-dimensional high-resolution seismic survey technology is carried out. This paper introduces the high-density and high-resolution 3D seismic data acquisition with three sources and multiple cables, which is firstly used for gas hydrate survey in offshore China. The acquisition parameters are 3 seismic sources with 25 m spacing, the cable spacing is 75 m, the bin size is 6.25 m×12.5 m, the source depth is 5 m and the cable depth is 6 m. After 3D pre-stack depth migration processing, the signal-to-noise ratio and resolution have been greatly improved compared with previous data, laying a foundation for the study of gas hydrate.