Abstarct: Aquifers or groundwater reservoirs are vital water sources for domestic, industrial, and agricultural uses. This study aims to identify the petrophysical characteristics of aquifers in the Igder region of Gonbad-e Kavus using well-logging diagrams and pumping tests, providing practical information for better groundwater management and utilization. Geologically, the area is covered with Quaternary sediments. Despite the presence of suitable vegetation and residential zones, a significant portion of the sedimentary units is not exposed on the surface. Deep exploration indicates that the region consists of alluvial deposits and sedimentary rocks, creating favorable conditions for water accumulation and transmission. In this research, self-potential, electrical resistivity, and gamma-ray logs were used to identify different sedimentary laxyers and distinguish water-bearing laxyers from others. By interpreting various well logs in the area, laxyer information was collected, and a 3D model of the groundwater reservoir was developed using Rockworks software. The estimated water volume for a specific laxyer exceeded two million cubic meters. Porosity varied between 5 % and 15 % due to the presence of different grain compositions, and permeability, influenced by clay content, was calculated at approximately 0/00025 m/s. To determine the critical discharge rate and well coefficients, step-drawdown and pumping tests were conducted, estimating the critical discharge rate at approximately 112 cubic meters per hour. Specific yield and other well characteristics were also analyzed. Water samples from wells in the study area were analyzed, and the results of water chemistry tests indicated relatively high carbonate hardness, while sulfate and chloride hardness were low, suggesting no saline water intrusion in the region. baxsed on water quality analysis diagrams, particularly the Piper diagram, the groundwater in this area falls within the fifth section of the chart, indicating good quality and suitability for drinking. The Wilcox diagram also shows low sodium content, classifying the groundwater as suitable to very good quality. The results indicate that the Igder region of Gonbad-e Kavus has aquifers with a good capacity for groundwater storage and transmission. The petrophysical characteristics of the aquifer, such as porosity and permeability, along with the favorable water quality of the wells, provide suitable conditions for efficient and optimal water resource utilization in the region.