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海拉尔盆地南屯组和铜钵庙组是主要的目的层,火山碎屑岩广泛发育,地层岩石中普遍含有凝灰质成分,并且凝灰质含量自上而下逐渐增多。由于储层中同时含有凝灰质和粘土矿物,使储层的孔隙结构变得复杂、渗透性变差,解释模型不适应。本文通过对比分析三种基于阳离子交换能力的饱和度模型,并对研究区块主要目的层粘土含量进行了统计分析,确定了该区块饱和度模型选用基于阳离子交换理论的威克斯曼-史密斯(Waxman-Smits)模型,在储层分类的基础上,对火山碎屑岩储层W-S模型中的m、n、Qv等参数进行了确定,通过在密闭取心井中进行验证,平均绝对误差为±8.2%,提高了饱和度参数计算精度。
The Nantun Formation and Tongbomiao Formation in Hailaer Basin are the main target strata. The pyroclastic rocks are widely developed. The stratigraphic rocks generally contain tuffaceous components, and the tuffaceous content gradually increases from top to bottom. As the reservoir contains both tuffaceous and clay minerals, the pore structure of the reservoir becomes complex and the permeability becomes worse, so the interpretation model is not suitable. In this paper, by comparing and analyzing three kinds of saturation model based on cation exchange capacity, and making a statistical analysis on the clay content in the main target layer of the study block, it is determined that the saturation model of the block selects the Wexman-Smith based cation exchange theory (Waxman-Smits) model. Based on the classification of reservoirs, the m, n, Qv and other parameters in the volcaniclastic reservoir WS model were determined. The average absolute error was ± 8.2%, improve the accuracy of saturation parameter calculation.