HYDROGEOLOGICAL FEATURES OF NATURAL BRINE SHOW ZONES WITHIN THE ASTRAKHAN ARCH
Knowledge about the hydrogeological section of wells to be drilled as well as trouble-free running procedure are always essential, since complications during drilling and their elimination lead to costs and construction period increase. As it is known, there is thick mass of stone salts of the Kungurian stage in the section of the Astrakhan arched uplift, and once it is penetrated, the following is observed: plastic movement of salts and viscous plastic clays, which cause casing collapsing; mud loss in intra-salt layers; natural brine shows; forecast and characteristic of these events are the most important aspect. The present article considers association and and hydrogeological features of natural brine show zones in the salt section of the Astrakhan arched uplift. Originality. We consider and analyse conditions of natural brine layers formation, factors effecting natural brine shows, hydrochemical characteristics of brines, features of llithology and filtration properties of intra-salt rocks. Summary. The presence of natural brine layers in the salts mass, their thickness, quantity, level of formation pressure, energy margin determine natural brine flow rate and effect well construction process, construction design, development of P&A interventions.