The Study Of Superimposed Property Close To The Dynamite Source

As the main source of the seismic exploration on the land, Dynamite source still plays a very important role. Under the environment of Major oil and gas resources in our country have been found and mined away, the seismic exploration has become more and more difficulty. Finding of the Hidden resources, such as the remaining oil, holds a more important position. A higher request has been put forward to the resolution of the seismic exploration. This requires not only has a higher level of data processing, but also a better stimulating method.In recent years, during the study of high resolution seismic exploration, the study focused on the depth of wells, the quantity of Dynamite in stimulating factors and the methods of data acquisition and processing, but did little on the source of the explosion, choosing the changing of the density and detonation velocity of the Dynamite column as the main direction. Obviously, this cannot meet with the requirement of the high-resolution. Somebody has done a few researches on the slender Dynamite column, but the results are not yet clear.Small quantity of Dynamite can stimulate high-frequency seismic waves. But in that way we will get a low energy seismic wave, and SNR decreases, then we will not get a high quality seismic exploration datum.In response to these deficiencies, with the situation of near source this article analyses and summarizes the state(as stress and changes) of media of every parts as well as the existence form and propagation characteristics , then detail the transitions of the various waves and their energy distribution. For the difficulty of recording the near source wave, with the help of the air gun array coherent combination method we can do some study of near source. On how to improve the excitation signal frequency and signal to noise ratio, we did a intuitive study and simulation on the vertical superimposed seismic source structure of delay explosion in the arrangement of the Dynamite structure. Finally, we did a effective analysis on the actual data, and draw a conclusion that delay explosion can meet with the new requirement of seismic exploration.