| ArticleName |
Multiple-point geostatistics for restoration of permeation nonuniformity of the Lovozero deposit |
| Abstract |
Modeling and characterization of the geometry and propagation of a network of cracks in rocks play an important role in hydrogeological research. At the same time, modeling fault zones and fractures is a technically difficult task, since it requires significant labor and computing resources, and also translates the solution into the plane of probabilistic estimates. The Lovozerskoye deposit is located within the limits of the alkaline syenite massif of the same name, it is characterized by strong fracturing and low quality of the rock mass. The hydrogeological conditions of the Lovozersky deposit are determined by the presence of numerous surface and underground watercourses adjacent to two aquifers: a loose layer of Quaternary rocks and underlying indigenous Paleozoic rocks. The authors used one of the most advanced methods for modeling filtration heterogeneity – the method of multipoint geostatistics (MPS, Multi Point Statistics). This is a stochastic algorithm that allows us to reproduce the spatial characteristics of an array’s heterogeneity by self-learning from a training image. The multipoint geostatistics method can reproduce fracture connectivity and complex, curved geological structures. This feature of the method allows us to propose using it as a tool for modeling a network of cracks and fractures and integrating them into hydrogeological models. This was done by the authors as part of developing a numerical geofiltration model for the Lovozersky rare metal deposit. To justify the outer boundaries of the hydrogeological model, the following principles were used: the boundaries should coincide with natural boundaries (with constant pressure) and the expected disturbance from the hydrodynamic system should not exceed the boundaries of the model.. As a result of the study, the authors found that for objects located in areas where groundwater is mainly found in cracks and veins and infiltration occurs along faults, it would be advisable to use the multipoint geostatistical method (MPS) for the most accurate modeling of irregular infiltration. However, this also requires a more detailed and irregular grid layout. |
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