Abstract:The bubble oscillation equations and pressure wavelet equations for large-capacity air-gun source are established, and several correction factors that have important influence on the simulation results are introduced, including open thermodynamic model, muzzle throttling,evaporation and condensation, gun body’s influence and air release rate to improve the traditional method of single air-gun pressure wavelet calculation. By comparing the simulation and the measured wavelets of reservoir experiment, influences of each correction factor on the wavelet simulation is analyzed, and the pressure wavelet of the large-capacity air-guns array is further calculated by the improved single-airgun signal. Comparing the wavelet waveform predicted by the improved simulation method with the measured signal, It shows that the improved model can simulate the source wavelet of single gun and gun array well. Finally, the reason why the model produces simulation error is analyzed.
ZHANG Guoping,WHANG Huishan,WANG Qingping et al. The Simulation of Large Volume Air-Gun Excited in Land Area and Analysis of Its Influence Factors[J]. jgg, 2019, 39(12): 1243-1248.