Research On Excitation Method Of Explosive Source In Complex Areas

This paper mainly discusses the explosion characteristics of explosive source and the distribution of the energy around the medium, for the purpose of solving the problem of seismic data acquisition in complex area from theory.An explosive source is the most commonly source in seismic exploration, which is one of the decisive factor of the seismic data that collected in the field. In uniform-level layered media, energy radiates out all around evenly. But in practical field exploration, shots bury in the complex near-surface environment, energy radiates out unevenly before reaching the objective layer, and the energy passed the objected layer is under different degrees of attenuation, which is not conductive to deep exploration for reducing the S/N ratio of seismic data.In order to improve the quality of seismic data, this paper studies the excitation effect of single source in complex areas. According to numerical simulation method, analyzing the influence of excitation depth?charge?lithology and the coupling relationship between the explosive and rock to the distribution of energy, studying the distribution of energy in different kinds of complex media, optimizing reasonable parameters, making the energy concentrated in the vertical direction, ensuring more energy incident to the deep formation. Then analysis the advantage of source array technology in complex areas, the technology includes conventional source array and a technology for source array design based on phase-array theory. Through the analysis of phase-array parameter and various excitation modes of phased, optimizing the reasonable parameters and excitation modes based on the orientation of the target body, the purpose of which is to make the energy propagate oriented, improve the intensity of illumination of target direction and the S/N ratio of seismic data.