Liu Sheng1, Li Shi-qiong2, Yang Ji-you1, Wen Xue-kang3
1. The Second Geophysical Service Company, Southwest Bureau, Sinopec, Deyang, Sichuan 618000, China;
2. Deyang Branch, Exploration and Production Research Institute, Southwest Branch Co., Sinopec, Deyang, Sichuan 618000, China;
3. Engineering Supervisation Center, Southwest Branch Co., Sinopec, Deyang, Sichuan 618000, China
Abstract:Tight sandstone gas reservoirs of Xujiahe group deeply buried in West Sichuan Depression belong to non-conventional reservoirs with super density and rich fracture development.It is very difficult to detect fractures and identify reservoirs on conventional 3D seismic data.To solve these problems,this article proposes a 3D3C seismic geometry design method and proposes a series of 3D3C seismic techniques in the field,such as analysis and control of three-component geophones,and source parameter optimization etc.A new way called by'acquisition by steps and blocks' is also introduced for overcoming large obstacles with limited equipment.Finally,high-quality 3D3C seismic data are acquired for reservoir characterization.