基于BISQ模型的泥质含量变化时移地震响应机制

Time-lapse seismic response mechanism with changes of clay content based on BISQ model

基于BISQ机制的双相介质模型,通过有效结合宏观条件和微观条件研究了地震波传播过程中的能量耗散和频散机制;基于泥砂岩岩石物理模型,分析了油藏注水开发条件下泥质含量变化引起的油藏弹性模量变化规律。在此基础上,通过双层地质模型时移地震响应数值模拟与差异属性分析,研究了油藏泥质含量变化前后P-P波和P-S转换波不同分量地震归一化均方根振幅属性随偏移距变化规律。结果表明,油藏泥质含量变化能够很好地模拟油田开发的动态过程,其引起的时移地震响应在不同分量和不同偏移距条件下差异清晰,P-P波、P-SV转换波归一化均方根振幅随偏移距变化差异明显,部分叠加处理技术将有利于提高时移地震处理与解释精度。

Based on two-phase BISQ model, energy diffusion and frequency dispersion of seismic wave field were studied un- der both macroscopic and microscopic condition. Based on siltstone rock physical model, the variation laws of reservoir elas- ticity modulus with clay content during water injecting development were analyzed. Furthermore, time-lapse seismic response numerical simulation and difference attribute analysis were studied. The variation laws of NRMS （ normalize root-mean- square） amplitude with offset for both P-P and P-SV components were investigated before and after clay content changes in rock model. The results show that oil-field dynamic development process can be simulated well with the changes of reservoir clay content. The time-lapse seismic response is remarkable at different components and offsets. P-P and P-SV NMRS ampli- tudes have obvious discrepancy with offset changes. And partial stack process technique will improve the precision of time- lapse seismic processing and interpretation.