摘要
随着AVO研究的不断深入,急需给出层状介质反射系数理论公式。本文在平面纵波入射和全固态介质假设条件下,导出了纵、横波反射、透射系数公式,并以单层为例计算出了不同厚度、不同入射波频率和不同埋深条件下,含气(包括高阻、低阻)与不含气时的反射系数随入射角变化的结果。文中还模拟界面的形态计算了同一反射点反射系数的变化,与简化的Zoeppritz方程计算的结果进行对比表明,纵波反射系数随入射角变化的趋势,两者是近于一致的。
To derive theoretical formula for calculating reflection coefficient in layered medium is very necessary because of the need of increasingly deepening AVO analysis. The formulas for calculating reflection and transmission coefficients of P and S-waves are derived on the assumptions of plane P-wave incidence and full solid medium. It is analysed in single layer example how reflection coefficient varies with incident angle when the layer has gas (high and low impedance situations) or no gas respectively in the cases of different thicknesses,various incident wave frequencies and varied depths.Interface conditions are modeled to estimate the reflection coefficient variation at a reflection point. It is shown that the estimated result of how Pwave reflection coefficient varies with incident angle nearly conforms with that obtained using reduced Zoeppritz's equation.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1991年第4期424-436,546,共14页
Oil Geophysical Prospecting
关键词
层状介质
反射系数
入射角
AVO
layered medium
reflection coefficient
incident angle
AVO technique
