苏里格气田苏59 区块气藏分布受砂岩横向展布和储层物性变化控制，气、水关系复杂，属于典型的 “三低”（低孔、低渗、低压）油气藏，采用传统的波阻抗反演方法不能有效识别储层及储层内流体的性质。 岩石物理参数分析可建立岩石物理参数与储层特征的关系，识别储层特征参数，指导储层预测。通过对研 究区苏59 区块进行详细的岩石物理参数分析，寻找出对岩性敏感的弹性参数交会组合，同时建立扩展弹 性阻抗（EEI）模型，确定与自然伽马（GR）、孔隙度（POR）和含水饱和度（Sw）相关性最好的EEI 曲线，更好 地反映了储层岩性、孔隙性及含油气性，对后期利用叠前地震资料进行弹性参数反演，预测储层及烃类分 布具有指导意义。

Reservoirs in block Su 59 of Sulige Gas Field are controlled by sandstone distribution and physical properties, with complicated gas-water relation. So it can not identify reservoir and fluid effectively by using traditional acoustic impedance inversion method. Through detailed rock physical parameters analysis, the elastic parameter combinations sensitive to lithology were found out, and extensive elastic impedance （EEI） model was established. EEI curves which have good relationship with natural gamma ray, porosity and water saturation were used to reflect lithology, porosity and oil-bearing ability. It is meaningful for elastic parameters inversion with pre-stack seismic data and reservoir and hydrocarbon distribution prediction.