振幅随偏移距变化的物理模拟

AVO PHYSICAL MODELING

地矿部石油物探研究所

振幅随偏移距变化(AVO)的物理模型研究,首先要解决岩性参数的相似模拟问题,文中提出了密度、泊松比和杨氏模量相似模拟的比例因子关系式。由此设计出研究AVO的两个物理模型,分别采用共炮点和共中心点记录方式进行试验观测。对观测结果的振幅数据作各种补偿校正处理后,得到仅与反射界面的反射系数有关的真振幅数据。它与用Zoeppritz方程的精确解法计算得到的理论结果可以较好地吻合。

Advisably, a solution one has to seek for is the similar simulation of lithologic parameters prior to making a study of AVO physical modeling, The relational expression of density, Poisson’s ratio and Young’s modulus is presented in the paper. Thereby, the 2 physical models for studying AVO are developed , which are undergone the examination on trial basis by utilizing CSP ( common sh-otpoint) and CMP ( common midpoint) respectively. Having had the observed amplitude data compensated, what’s obtained is but the true amplitude data being relevant to the coefficients of reflection horizon. It coincides fairly well with the theoretical outcome accurately calculated by using the Zoeppritz’s equation.