论文部分内容阅读
流体替换是了解和预测地震波速度和波阻抗如何依赖孔隙流体变化的有效工具,参数多、不确定性大是流体替代的特点,其中,干岩石模量是链接流体和饱和岩石的关键,也是Gassmann方程的基础,因此干岩石模量值的确定是流体替代的难点.前人对干岩石模量也进行了大量的研究,提出了许多经典模型:疏松砂岩模型、Kuster-Toksoz模型、自相容模型(selfconsistent模型)、微分有效介质模型(DEM模型)等,但这些模型都具有一定的局限性,本文通过对Gassmann方程图形分析方法(Mavko and Mukerji,1995)的研究,提出了一种计算干岩石模量的新方法.通过实际的岩样数据分析这几种算法的应用效果,研究结果认为求取干岩石模量时,本文提出的新方法具有很好的应用效果.
Fluid replacement is an effective tool for understanding and predicting how seismic wave velocity and impedance depend on pore fluid changes. Many parameters and large uncertainty are the characteristics of fluid substitution. Dry rock modulus is the key to link fluid and saturated rock and is also the key to Gassmann Equation, so the determination of dry rock modulus is the difficulty of fluid replacement.Many predecessors have done a great deal of research on dry rock modulus, and put forward many classic models: loose sandstone model, Kuster-Toksoz model, self-compatible Model (selfconsistent model), differential effective medium model (DEM model), etc. However, these models all have some limitations. In this paper, through the study of the Gassmann equation (Mavko and Mukerji, 1995) The new method of rock modulus is to analyze the application effects of these algorithms by the actual rock sample data. The results show that the new method proposed in this paper has a good application effect when the dry rock modulus is obtained.