用正演模型研究地震垂向分辨率

A Study on Seismic Vertical Resolution by Forward Model

研究地震反射波垂向分辨率与地层结构及入射子波的频率关系和砂层组中砂岩百分比与地震反射波振幅、波阻抗之间的关系。制作了2种地质模型:一种是不同厚度的砂泥岩地层组合模型;另一种是不同砂泥岩百分比的砂泥岩地层模型组合。研究表明,地震反射波振幅、波阻抗与砂泥岩百分比具有线性正比关系。地震反射波垂向分辨率与入射到目的层的子波频率有关,与地层沉积韵律及结构有关。

In order to investigate the relation of vertical resolution of seismic reflection with stratum structure and frequency of incidence wavelet, and the relation between the percentage of sandstone and the amplitude and wave impedance of seismic reflection in sand layers, two geological models are developed. One is the stratum association model with different thickness of sand-mudstone; the other is the association of stratum models with different percentages of sand-mudstone. The study shows that there exist linear proportional relations between the seismic reflection amplitude and wave impedance and the sand-mudstone percentage. The vertical resolution of seismic reflection is related not only to the incidence wavelet frequency into target zone, but also to the stratum sedimentary rhythm and structure.