【摘要】 地震勘探菲涅耳带在优化观测系统设计、研究横向分辨率、确定最优偏移孔径及地震解释等方面有着广泛的应用。文中针对空间水平界面,给出了不同炮检距菲涅耳带三个特征参数理论表达式及其与零炮检距有关的近似表达式,并从能量的角度验证了(第一)菲涅耳带的重要性。理论分析和数值模拟表明,存在一个临界炮检距,当实际炮检距小于临界炮检距时,菲涅耳带半径(面积)随反射界面深度的增大而增大;当实际炮检距大于临界炮检距时,菲涅耳带半径(面积)随反射界面深度的增大先减小而后增大,即存在相对大炮检距最小菲涅耳带问题。更多还原

【Abstract】 There is wide application for Fresnel zone of seismic prospecting in aspects of optimizing geometry design,studying lateral resolution,determining optimum migration aperture and seismic interpretation. The paper gave three theoretical expressions of characteristic parameters of Fresnel zone with different offsets and approximate expressions associated with zero-offset in spatially horizontal interface and proved the importance of (first) Fresnel zone from the angle of energy. The theoretical analysis and numeric simulation showed that there exists critical offset only relative to dominant wavelength:along with the increase of the depth of reflecting interface,the radius (area) of Fresnel zone increases when the real offsets are less than critical offset and decrease first and then increase when the real offsets greater than critical offset,existing the issue of min Fresnel zone relative to large offsets.更多还原