3D oil and gas seismic acquisition in coal goaf zone

The goaf of coal seams not only destroys the sedimentary structure and structural characteristics of the original strata, but also significantly affects the quality of seismic data of the underlying strata. S area is a tight sandstone gas/coalbed methane exploration area in the Loess Plateau of China. There are a large number of two type goaf in the shallow part of the work area, accounting for 56.4% of the full coverage area. The seismic acquisition is difficult and the safety risk is high. To reduce the impact of goaf and ensure the quality of seismic data, through theoretical analysis and field acquisition tests, special measures were developed in addition to conventional loess tableland acquisition practices, including the optimized layout of shot points in goaf areas, the principle of adding shot points based on the energy difference inside and outside goaf, and the explosive charge design considering safety. These methods ensure the smooth implementation of the project and provide good reference for similar exploration areas.