Research on Energy Radiation Characteristics of an Airgun Source Excited in Land Reservoir1

摘要

The energy radiation process of an airgun seismic source in land reservoir is studied based on the underwater wavelet data collected in the airgun excitation experiments in Binchuan, Yunnan, China. The empirical formula for calculating the bubble pulsation period and the maximum radius of the underwater airgun seismic source is obtained. The results show that: ① The energy radiation efficiency is higher vertically than horizontally. ② The vertical bubble energy radiation efficiency increases with the increase of the air supply pressure. ③ The vertical energy radiation efficiency of the airgun seismic source is 9. 4％when the air supply pressure is 15MPa. ④The higher the air supply pressure, the further the propagating distance of the superposition-enhanced pressure wave of an airgun source.