Numerical Simulation of Excitation Source with Medium of Different P-wave Velocity

Source excitation is an important factor of the effects of seismic exploration. Choosing the appropriate excitation parameters in oil and gas exploration in order to get better seismic record is necessary. By using the software ANSYS/LS-DYNA, we adopted Lagrange algorithm based on the finite element method to simulate the seismic source of the cylindrical explosive. In this paper we focus on the frequency component of excited seismic waves in single well. Through the study of explosive detonation velocity and explosive shape we conclude that the dynamite with low detonation velocity and elongated grains has high excitation frequency and energy in the medium with low P-wave velocity, but the dynamite with high detonation velocity and short-thick shape has high excitation frequency and energy in the medium with high P-wave velocity. We want to provide references for the choices of excitation parameters in actual exploration to save exploration costs.