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HYDROGEOCHEMICAL CHARACTERIZATION OF CARBONATE OIL DEPOSITS: INSIGHTS INTO IONIC COMPOSITION, FRACTURING AND CONNECTIVITY
Abstract
In this work, the ionic composition of formation water of three oil deposits (C2vr, C2b, C1pr) was studied. The study of these deposits holds both practical and scientific interest. Due to their complex geological structure, they are difficult to develop. Productive deposits are characterized by the presence of widespread unconsolidated zones with high vertical and horizontal fracturing, high layered heterogeneity, the absence of significant regional reservoir-seal rock, and difficulties in cross-well section correlation. The close position of the Oil-Water Contact (OWC) and the high degree of fracturing contribute to the rapid watering of production wells. Reservoir brines are characterized by an unusual hydrogeological composition: this is a significantly lower mineralization (30 g/l) of C2b and C1pr deposits instead of 250 g/l in comparison with brines of the same age in neighboring areas. We found the different ratio of the main ions, a lower position of the upper boundary of the zone of distribution of calcium chloride-type brines, lower content microcomponents. In the work, the ionic composition of about 200 brine samples of the deposits was studied. Mass concentrations of six macrocomponents: HCO3-, SO42-, Cl-, Ca2+, Mg2+, Na+K+-were determined, along with measurements of TDS, acidity, and density of formation waters. Based on the results of the analysis, the features of the hydrogeochemical properties within the carbonate deposits were established. Zones of hydrodynamic connectivity of the deposits with each other have been identified. New fractures were found. The results obtained are recommended to be used for identifying the water source in case of well interventions.
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