Research and application of source location-velocity joint inversion of interference investigation during 3D seismic exploration

Cost, quality and efficiency are important objectives of 2D/3D seismic exploration for oil and gas. Sichuan Basin is densely populated, with a large number of cities and towns accompanied with frequent industrial production activities, which bring great challenges to seismic exploration. For the vibration generated by large-scale engineering activities, the dynamic and kinematic characteristics of induced seismic waves are similar to those of seismic waves during exploration, which are difficult to be completely eliminated by de-noising. It is not only seriously affects the quality of seismic data, sometimes causes seismic recording to be nonconforming data. Aim to hundreds to thousands of square kilometers exploration area, it is extremely important for the acquisition quality and efficiency of seismic exploration by quickly locating and identify the interference to negotiate stopping. Based on the dynamics and kinematics characteristics of seismic wave, this paper establishes a source location-velocity joint inversion method to quickly locate the interference both in and outside of the seismic exploration area. Through the location precision test of the active seismic, the location precision can reach to 10 m along the direction when the observation lines perpendicular to the source. For interference far away to the seismic exploration area, it contributes to greatly reduce the searching zone and the equivalent velocity also contributes to the classification of interference. Theoretical and actual data tests prove that it is effective to provide important technical support for identify the interference and improve the quality and efficiency of 2D/3D seismic exploration.