【摘要】 本文将相控阵理论技术应用于组合激发理论分析中,给出了理论信噪比的定义及计算方法。通过改变震源数目、组内距和波长等参数控制相邻震源的波程差,使各震源产生的地震波在某一方向同相叠加,进而使理论信噪比最大化。同时利用波动方程正演,验证了理论信噪比与主要组合参数的内在关系,剖析了复杂地区组合激发压制噪声提高信噪比的机理,从而设计出最佳的组合激发震源数目、组内距等参数。更多还原

【Abstract】 Source pattern theoretical analysis is performed in this paper using phased-array control theory and the definition of theoretical signal-tonoise ratio(SNR)and its calculation method are presented.By changing parameters such as source element number,element interval and wavelength to control wave path difference between adjacent source elements,seismic waves generated by each source element are stacked in an in-phase manner in a certain direction,and the theoretical signal-tonoise ratio becomes maximized.Taking advantage of the wave equation forward modeling to verify the inner relation between theoretical signal-tonoise ratio and the main source pattern parameters,we dissect the mechanism that source pattern can suppress noise and improve signal-to-noise ratio in complex areas.So,the best source pattern parameters including source element number and element interval can be designed.更多还原