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利用大容量气枪震源在陆上水库进行地震波激发试验,研究陆上水库环境下激发气枪震源所产生的地震波特征及传播距离.试验结果表明,大容量气枪震源是具有丰富的10Hz以下低频信号的低频震源,其激发的地震波具有传播距离远,穿透深度深的特点.在185km长的测线上均记录到了气枪信号,成功检测到Pg,Pc,P2,PmP和Pn等多组震相,并在此基础上对地下深地壳结构进行了一维速度结构正演,讨论了该区域壳幔过渡带的低速结构.气枪震源还具有一般炸药震源不具有的特征,如长期定点重复激发和有效转换S波的优点,是陆上进行长炮检距深穿透地下结构研究的一种优良人工震源.
A large-capacity air-gun source was used to conduct seismic wave excitation tests in onshore reservoirs to study the characteristics and propagation distance of the seismic wave generated by the aero-gun source in an onshore reservoir environment.The experimental results show that the large-capacity air gun source is a low frequency The source of seismic waves excited by the seismic wave has the characteristics of far propagation distance and deep penetration depth.An air gun signal was recorded on the 185 km long line and multiple sets of seismic phases such as Pg, Pc, P2, PmP and Pn were detected successfully On this basis, a one-dimensional velocity structure forward modeling of the deep underground crustal structure was carried out, and the low-velocity structure of the crust-mantle transitional zone in this area was discussed.The characteristics of the airgun focal source were also not found in general explosives sources such as long-range fixed-point repeated excitation and effective conversion The advantage of S-wave is an excellent artificial seismic source for the study of deep penetrating subsurface structures by long-range offsets on land.