The Quantitative Evaluation Index System for Uranium Reservoir Heterogeneity in Hantaimiao Region, Ordos Basin

Uranium reservoir heterogeneity plays an important role in the process of uranium mineralization. However, people have not been recognized and need further study on the uranium reservoir heterogeneity of Hantaimiao region in Ordos Basin. By plane mapping and statistical analysis of quantitative heterogeneity parameters is study area, it shows that the heterogeneity of uranium reservoir sand body can be quantitatively characterized by sandstone thickness, sandstone percentage, sandstone grain size, number and cumulative thickness of clay isolated barrier beds, and original organic carbon content. It is found that uranium reservoir heterogeneity is weak at the central axis area of braided distributary channel sand body; and becomes strong at the both edges of the central axis area of sand body and the downstream area. Through the comprehensive analysis of the relationship between quantitative heterogeneity parameters and uranium mineralization information, uranium reservoir heterogeneity is divided into class I (weak), class II (medium) and class III (strong). The uranium mineralization in class II reservoirs is the most active. And the quantitative evaluation index system for uranium reservoir heterogeneity, which is comprehensively evaluated by multi parameters, is established ultimately. It is generally held in previous qualitative research that uranium reservoir heterogeneity controls uranium mineralization process and also affects the in-situ leaching uranium process. This quantitative evaluation index system will be able to predict more accurately the uranium target area and to optimize the project deployment of in-situ leaching uranium, improving the efficiency of the exploration and mining of uranium.