一种基于胶结因子谱的砂砾岩胶结程度的判定方法

准噶尔盆地致密砂砾岩储层具有岩性复杂、低孔隙度、低渗透率、非均质性极强、孔隙结构复杂的特点。如何综合评价此类储层已成为迫切需要解决的任务，特别是反映储层孔渗胶结程度的判别尤其重要。该文利用阿尔奇公式中岩石的胶结指数，同时结合微电阻率扫描成像测井导出胶结因子谱，进行定性储层胶结程度评价，在此基础上，从谱图上提取出期望值和方差进行定量的储层评价，划分出胶结弱、胶结中等、胶结强三类储层，大幅提高有效储层识别率至88.1%，对客观评价储层及寻找有利区具有重要的现实意义。

A Method for Determining the Cementation Degree of Glutenite Based on Cementation Factor Spectrum

Tight glutenite reservoirs in Junggar Basin have the characteristics of complex lithology, low porosity, low permeability, strong heterogeneity and complex pore structure. How to evaluate such reservoirs comprehensively has become an urgent task. Especially, it is important to judge the cementation degree of reservoir porosity and permeability. In this paper, the cementation index of rock in Archie formula is used, and the cementation factor spectrum is derived by combining micro resistivity scanning imaging logging to evaluate the cementation degree of qualitative reservoir. On this basis, the expected value and variance are extracted from the spectrum chart for quantitative reservoir evaluation, and three types of reservoirs are classified into weak, medium, and strong cementation, which greatly improve the effective reservoir identification rate to 88.1%. It is great practical significance to evaluate the reservoir objectively and find favorable areas.