【摘要】 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-Toksz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.更多还原

【Abstract】 Fluid substitution is a rock physics issue in which we can understand and predict how seismic wave velocity and its impedance rely on pore-fluid.There are two problems in fluid substitution,too many parameters and a great deal of uncertainties.For example,it is pretty difficult to calculate dry rock moduli..First of all,we has built up rock physical models to check various methods to calculate dry rock moduli,and then the dry rock moduli can be obtained in these methods after inputting log data.Based on this study,Kuster-Toksz model can present rock dry moduli with good precision in low porosity area(carbonate reservoir).Pride’s method of consolidation parameter is a good idea,but it is suitable only for high porosity area. Biot coefficients and Pride’ consolidation parameters can join together by the critical porosity.Only by self-consistent model can we calculate the correct dry rock moduli both in low porosity and high porosity.更多还原