1. 1.石油大学资源与信息学院,北京 100083;2.中国石油勘探开发研究院西北分院,甘肃 兰州 730020
• 收稿日期:2005-08-16 修回日期:2005-12-13 出版日期:2006-03-15
• 通讯作者: 雍学善 E-mail:yxs321@263.net

### A Study of AVO Equation in Dual-phase Medium and Parameter Simplification

Yong Xueshan 1,2,Ma Haizhen 2,Gao Jianhu 2

1. 1. Faculty of Resource and Information China University of Petroleum, Beijing 100083,China;2. PetroChina Exploration&Development Research Institute(Northwest),Lanzhou 730020,China
• Received:2005-08-16 Revised:2005-12-13 Online:2006-03-15 Published:2006-03-15

Based on the equation group of reflection coefficient and transmission coefficient in the interface of two types of dual-phases mediums, three equation groups of reflection coefficient and transmission coefficient in three kinds of interfaces have been derived, which are the interface between one-phase and dual-phase medium that is the top of reservoir, dual-phase and one-phase that is the bottom of reservoir, one-phase and one-phase medium that is the interface of two tight rocks. The AVO equation group from one-phase to dual-phase has been produced comprehensively. The relationship formula have been built between parameters（A, N, Q, R, ρ11, ρ12, ρ22, Ø） of the dual-phase medium and prime wave velocity, second wave velocity, density, porous and kind of fluid that include brine, oil and gas. All of these studies have made a beneficial exploration of AVO theory in dual-phase medium to practice. Three kinds of lithological interfaces have been designed. The reflection coefficient curves of different interfaces have been calculated respectively by dual-phase medium AVO equation and Zeoppritz equation, which provedhat Zeoppritz equation is a special case of dual-phase medium AVO equation.

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