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炸药激发是陆上地震勘探的主要激发方式 ,激发因素对地震 (尤其是高分辨率地震 )勘探显然是至关重要的。虽然已有诸多关于激发理论及参数选择方面的文献 ,但大多是在某种特定药型、药量条件下所作的分析 ,其结论不具广泛性。研究激发条件的目的是要获得理想的激发子波 ,但目前直接对激发子波进行观测并作分析的还不多。本文介绍了用不同药量的多种成型炸药在高速层中进行激发和观测的方法 ;对在弹性区形成的地震子波作了定性和定量分析 ,包括子波波形、频谱、能量与药量的关系及地震波在高速层中的衰减规律等 ;得到了一系列有意义的结论。
Excitation of explosives is the main excitation method of onshore seismic exploration. It is obviously that excitation factors are crucial for the exploration of earthquakes (especially high-resolution earthquakes). Although there are a lot of literature on excitation theory and parameter selection, most of them are analyzed under a certain drug type and dosage, and the conclusions are not extensive. The purpose of studying the excitation conditions is to obtain the ideal excitation wavelet, but there are not many direct observations and analysis of the excitation wavelet. In this paper, the methods of excitation and observation in a high-velocity layer using a variety of explosives with different doses are introduced. The qualitative and quantitative analysis of the seismic wavelet formed in the elastic zone is made, including the waveform, spectrum, energy and dose And the attenuation law of seismic wave in the high-velocity layer. A series of meaningful conclusions have been obtained.