Kinds of temperature variability at the wells mouth for many years, outlet discharge monthly and annual production volume, pressure, mineralization, hydrodinamical and hydrochemical characteristics of thermal waters in the development regime are studied by methods of statistical analysis. The analysis is done for the period of 10 years (1974-1983) according data of 50 wells from 4 geothermal deposits in Daghestan (the Northern Caucasus, Russia).

Variability of these parameters in time is approximate by polynomial trends of the 6-th degree. Temperature variability poorly correlates with the operating parameters of thermal waters, but geological factors influence greatly on the hydrodinamical and hydrochemical characteristics variability of the producing deposits, this fact made it possible to find a number of regularities of temperature variability. For example, the maximum temperature difference at the wells mouth in limits of the deposit in the operation regime corresponds to the maximum fluids temperature difference, which are extracted from the beds with the maximum and minimum thickness, and it is also close to the value of differences between fluids temperatures, extracted from the beds with the maximum and minimum roof bedding depths. Temperature regularity in statics is expressed by the rising of temperature while passing from the crest of structure to monocline background. Approximation of empirical data by this doesnít have the state of correlative but functional dependence.

Cluster analysis of thermal waters characteristics variability demonstrated, that main hydrodinamical and hydrochemical characteristics and operating parameters of these waters of Chokrak horizon of Middle Miocene form in the development regime of deposits hierarchy systems of similarity as inside one deposit of a definite type, as between structural deposits of a similar type (anticlines and monoclines). Hierarchy similarity indexes inside such hierarchy are defined by relations of water-bearing bed thickness to the its roof bedding depth.

The revealed hierarchy similarity regularities of clusters can serve as main predictive indicators while imitate modeling of geothermal reservoirs and geothermal deposits operation. Similarity hierarchy of temperature clusters, pressure and outlet discharge is formed from clusters in close connection of these wells to structural elements and definite range of the roof depth of Middle Miocene rock complex. Hierarchy similarity systems for one deposit have narrow ranges roof depths of Middle Miocene, for different deposits ñ wide depth ranges. The lower hierarchy similarity level for outlet discharge corresponds one step rising of hierarchy level on temperature similarity hierarchy levels for temperature and pressure within one deposit limits become equal from the second similarity level.

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