基于改进BISQ模型双相介质波场数值模拟

WAVE-FILED SIMULATION IN TWO-PHASE MEDIA BASED ON THE ADVANCED BISQ EQUATION

Biot理论和喷射流动理论是表述动态孔隙弹性性质的基础理论。弹性波在多孔隙双相介质中传播时固-流相互作用的这两种力学机制是同时存在的,Biot流动力学机制描述的是宏观现象,喷射流动机制反映的是局部特征,Dvorkin和Nur将其两者有机结合,提出了统一的BISQ(Biot-Squirt)模型。Mamadou Sanou和Erwin Appel又提出了不含特征喷射流动长度的改进BISQ模型,更便于描述且计算简单,正演数值模拟表明:改进BISQ模型与BISQ模型的结果保持一致,具有较好的可行性。

The Biot-flow and Squirt-flow mechanisms are the basic mechanisms of fluid flow in porous media with fluids. The effects of the two mechanisms on propagation of acoustic waves in the two-phase media exits simultaneously. The Biot-flow theory describes the macroscopical phenomenon and the Squirt theory describes the microcosmic phenomenon. Dvorkin and Nur presented a BISQ model, where the Biot and Squirt-flow mechanisms are unified and associative. Mamsdou Sanou and Erwin Appel presented an advanced BISQ model not including characteristic squirt length, it is easier to describe and be calculated. The result of the wave-field simulation indicates that the characters of the wave-field simulation of the BISQ model and the advanced BISQ model are consistent, the advanced BISQ model is much feasible.