MODELING OF THE HYDRODYNAMIC REGIME OF THE UPPER CAMBRIAN AQUIFER COMPLEXES DURING THE OPERATION OF THE NYURBINSKAYA PIPE (WESTERN YAKUTIA)

Abstract

Development of the main deposit of the Nakyn kimberlite field – the Nyurbinskaya pipe – is associated with the opening of Upper Cambrian aquifer reservoirs, which are the source of highly mineralized natural brines entering the quarry. Technical solutions implemented in the process of diamond mining affect the hydrodynamic regime of the aquifer complexes: the regional subpermafrost Upper Cambrian and the sporadically distributed interpermafrost Upper Cambrian. Modeling of the hydrodynamic regime is an important method used for processing information and making a forecast, allowing for the development of technical measures that facilitate the effective drainage of the deposit. It is important to take into account the dynamics of changes in the level regime directly in the quarry area, taking into account the features of local geology and cryohydrogeology. The forecast of changes in the hydrodynamic regime was carried out using the hydrogeological modeling program (Feflow software). When constructing the hydrodynamic model, the hydrogeological characteristics of the interpermafrost Upper Cambrian and subpermafrost Upper Cambrian aquifer complexes were detailed. As a result, we obtained new information on the local change in the hydrodynamic regime of the aquifer complexes opened by the quarry. The paper presents the maps-schemes of piezometric surfaces and traces the development of the depression funnel.