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流体替换分析是了解和预测地震速度和波阻抗如何依赖孔隙流体的岩石物理问题.参数多、不确定性大是流体替代的特点,其中,干岩石模量值的确定是流体替代的难点.本文首先通过模型假设,分析几种流体替代过程中的干岩石模量的计算方法,然后通过沙泥岩、盐酸盐岩储层实际测井数据,分析这几种算法的应用效果及其限制条件.研究结果认为求取干岩石模量时,Kuster-Toksz模型(K-T模型)在低孔隙度区域(盐酸盐岩储层)的应用效果很好.Pride固结参数法虽然思路比较好,但它仅适用于孔隙度发育比较好的区域,Biot系数法和Pride固结参数法可通过临界孔隙度统一起来,因此,二者计算干岩石模量得到相似的结果.而自相容模型(self-consistent模型),在两种储层中应用效果都比较好.
Fluid replacement analysis is to understand and predict how the seismic velocity and wave impedance depend on the pore fluid, and many parameters and uncertainties are the characteristics of fluid substitution, in which the determination of the dry rock modulus value is the fluid substitution difficulty. First, the model assumptions are used to analyze the calculation methods of dry rock modulus in several fluid replacement processes. Then, the actual logging data of the sand shale and the hydrochloric acid rock reservoir are used to analyze the application effects and the limitations of these algorithms. The results show that Kuster-Toksz model (KT model) has a good effect in low porosity region (hydrochloride reservoir) when determining the dry rock modulus.Pride consolidation parameter method is better, However, it is only suitable for the regions with better porosity development. The Biot coefficient method and Pride’s consolidation parameter method can be unified by the critical porosity, therefore, the calculated results of the two models have similar results, while the self-compatible model self-consistent model), the effect is better in both reservoirs.