基于多参数变胶结指数的致密砂砾岩饱和度精细评价: 以准噶尔盆地乌尔禾组为例

为解决阿尔奇公式在致密砂砾岩储层饱和度计算数值不准的问题，以准噶尔盆地乌尔禾组砂砾岩储层为研究对象，基于岩电、孔渗、粒度、铸体薄片实验数据，分析孔隙结构、孔隙度、粒度中值、黏土含量对胶结指数的影响因素，根据理论分析和测井响应特征对各参数进行了表征，最终建立了多参数变胶结指数计算模型。该方法以常规测井资料为基础，全面的考虑到影响胶结指数的各因素，在无特殊资料的井上也能得到很好应用，具有高适用性、高精度的优点。应用该模型对研究区探井砂砾岩段进行储层解释评价，并与密闭取心饱和度进行对比，结果表明，该模型显著提高研究区砂砾岩储层饱和度计算精度，在探井解释与储量计算中均有较好应用。

Fine Saturation Evaluation of Tight Glutenite Reservoirs Based on Multi-parameter Variable Cementation Index Modeling：A Case Study of Wuerhe Formation in Junggar Basin

In order to solve the problem that the Archie''s formula is inaccurate in calculating the saturation of tight glutenite reservoirs, the glutenite reservoir of Wuerhe formation in Junggar basin was taken as the research object. Based on the experimental data of rock electricity, porosity, permeability, particle size and casting thin section, the influence factors of pore structure, porosity, median particle size and clay content on the cementation index were analyzed. Then, various parameters were characterized based on theoretical analysis and logging response characteristics. The quantitative evaluation model for the variable cementation index m was ultimately established by multi-parameter regression fitting. This method is based on conventional logging data and comprehensively considers various factors that affect the cementation index. It can also be well applied in wells without special data, and has the advantages of high applicability and precision. The reservoir interpretation and evaluation were conducted in the glutenite section of exploration wells in the study area, and the results were compared with the saturation of the sealed coring. The results show that the model can effectively improve the calculation accuracy of glutenite reservoir saturation in the study area, and has good application effects in exploration well interpretation and reserve calculation.