Reflection coefficient formula and model calculation which arc applicable for AVO analysis in the case of layered rnedium
Wang Enhua
The First Geological Survey Division, Bureau of oil Geophysical prospecting, P.O. Box 3,Tangguantun, Jinghai County, Tianjin City, China, Internal postcode: 301608
Abstract:To derive theoretical formula for calculating reflection coefficient in laVered 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 impedancesituations) or no gas respectively in the cases of different thicknesses, various incident wave frequencies and varied depths. Interface condition are modeled to estimate the reflection coefficient variation at a reflection point. It is shown that the estimated result of how P-wave reflection coefficient varies with incident angle nearly conforms with that obtained using reduced Zoeppritz's equation.
汪恩华. 适用于AVO分析的层状介质反射系数公式及模型计算[J]. 石油地球物理勘探, 1991, 26(4): 424-436.
Wang Enhua. Reflection coefficient formula and model calculation which arc applicable for AVO analysis in the case of layered rnedium. OGP, 1991, 26(4): 424-436.