【摘要】 Kirchhoff真振幅偏移研究表明,偏移对地震子波具有拉伸作用,拉伸程度与地震波速度、反射角和地层倾角有关.子波拉伸将改变子波宽度(子波延续长度),对垂直分辨率有重要影响.本文通过对衰减Sinc子波的实际计算,分析了地震波速度、反射角和地层倾角分别与子波宽度的关系.从分析来看,陡倾角和大反射角(大炮检距)造成偏移成像垂直分辨率严重下降.高主频子波对各参数均有较低敏感度.更多还原

【Abstract】 The study of Kirchhoff true amplitude migration indicates that the wavelet is distorted by migration.This distortion is the consequence of varying reflection angles, reflector dips and velocity variation.The distortion changes the wavelet width, which has important influence on vertical resolution.In this article, we analyze the relationship between the wavelet width and the reflection angle, the reflector dip, the velocity, by the calculation of the attenuation Sinc wavelet.The results show that the vertical resolution descends strongly on the steep reflector dip and large reflection angle (distant offset).The high main frequency wavelet has a low sensitivity to each parameter.更多还原