THE METHOD OF PIECEWISE APPROXIMATION OF STATIC CHARACTERISTICS OF DEEP-LYING HYDROLITHOSPHERIC PROCESSES
Abstract
This paper addresses the problem of describing the static characteristics of hydrolithospheric processes in deep-lying aquifers using the Essentuki mineral groundwater field, classified as a Category IV deposit in terms of geological complexity, as a case study. It is shown that classical methods for approximating distributed transfer functions, widely applied in the analysis and design of control systems for shallow aquifers at depths of 50–400 m, are not applicable to deep-lying conditions. This limitation is caused by high gas saturation of groundwater, pronounced structural heterogeneity of reservoirs, complex and often nonlinear hydraulic interaction between production and observation wells, as well as spatial and temporal variability of hydrochemical parameters. A modified method of piecewise approximation of static characteristics of hydrolithospheric processes is proposed. The method is based on the separate identification of parameters of approximating elements over individual distance intervals between wells using the results of pumping tests. The approach was implemented for the Cenomanian–Maastrichtian aquifer of the Novoblagodarnensky area of the Essentuki field, where hydraulic interaction coefficients between wells were calculated and static transfer functions were constructed for different spatial intervals, taking into account actual geological and filtration conditions. The results demonstrate that the use of piecewise approximation provides a better agreement with experimental data compared to homogeneous models and allows spatial variability of filtration properties to be taken into account. The obtained results form a methodological basis for forecasting hydrodynamic and gas–hydrochemical changes, assessing the stability of operating regimes, and developing and synthesizing control systems for regulating discharge rates of deep mineral groundwater wells. The practical significance of the study lies in the applicability of the proposed method to substantiating pilot industrial operation parameters, adjusting design solutions, interpreting monitoring and pumping test data, and formulating scientifically grounded recommendations for groundwater abstraction management, reduction of technogenic disturbances, and preservation of the stability of hydrolithospheric systems under conditions of intensive field development.
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