Abstract: The article considers a system in which the territorial features of reservoir layers are investigated, which is manifested in the formation of certain genetic types of groundwater. The actual problem is the study of the hydrogeochemical conditions of individual geological structures of the Yuzhno-Khulymsky field, in the future containing industrial accumulations of hydrocarbons. The purpose of research. The studies are aimed at studying the hydrogeochemical indicators of the reservoir oil reservoir MZ-125 in order to assess the oil and gas potential of the North-Eastern block of the South Khulym field. Tasks of research. To achieve the goal, it is necessary to solve the following tasks: - processing and systematization of data on the geochemistry of groundwater of the North-Eastern block of the Yuzhno-Khulymsky field; - hydrogeochemical study of the South Khulym sedimentary basin, zonality and genetic characteristics of groundwater, the degree of their metamorphization; - analysis of the gas composition of groundwater reservoir rocks of the North-Eastern block of the South-Khulymsky field; - division of groundwater into genetic types; - calculation of various coefficients of genetic indicators of groundwater. Research results. For oil and gas exploration purposes, the following indicators of the salt composition of water were used: type of water and nature of total mineralization, water metamorphism coefficients, sulfate content, trace element content (ammonium, iodine, bromine, boron, etc.), rare and trace elements (strontium, vanadium, nickel , copper, molybdenum, etc.). The results of the chemical composition of groundwater in reservoir rocks of the Northeastern block of the Yuzhno-Khulymskoe field were analyzed according to the data of exploratory and structural drilling. The genetic factors, elemental composition, type of brines were determined. The presence of CaCl2 salt in brine is associated with metamorphization in limestone. The process of dolomitization is of particular importance: 2CaCO3 (limestone) + MgCl2 (brine) = СaCO3 × MgCO3 (dolomite) + СaCl2 (brine). These types of brines are characteristic of oil fields. Since chlorine-calcium and bicarbonate types of groundwater are associated with hydrocarbons, the Northern block located at higher hypsometric elevations may represent a promising area, which is a kind of trap on the migration route of groundwater characteristic of the oil and gas of the Eastern and North-Eastern blocks. In this regard, the search and assessment of this area is justified, the Northeast bloc is the primary and promising object possibly containing industrial accumulation of hydrocarbons.
|Issue||2019, № 1 (Т. 11)|
|Key words||field, geochemistry of groundwater, sedimentary basin, accumulation of hydrocarbons, reservoir reservoir, hydrogeochemical conditions, oil and gas.|