GEOCHEMISTRY FEATURES OF ALUMINUM IN OILS AND CLASSIFICATION OF THE DEPOSITS OF THE DNIPRO-DONETSK DEPTH ACCORDING TO ITS CONTENT

Abstract

Problem Statement and Purpose. The purpose of this publication is to establish, on the basis of geochemical studies of oils, the specifics of the relationship between aluminum concentrations and the content of other impurity metals, the values of the main mining, industrial and technological parameters and indicators of oils and their deposits, and to develop a natural classification of oil deposits on the example of Dnipro-Donetsk depth by content aluminum. Solving the task of the article will contribute to the development of a set of predictive criteria for hydrocarbon accumulations and the scientific substantiation of the geological-economic, technological and ecological assessment of their use, which in turn determines the relevance and practical value of the conducted research. Data & Methods. The factual basis of the work was the results of analyzes of metal content in oils from 36 deposits. At least 30 oil samples from each deposit were tested for metal content using X‑ray fluorescence analysis on an energy-dispersive spectrometer. All values of metals concentrations and their technological parameters were normalized to bring the information to the same scale, regardless of the units of measurement and the scale of the samples. Calculated normalized values of indicators of oil samples from each deposits were processed using the STATISTICA 11.6 program, which performed the calculation of descriptive statistics, correlation, regression, cluster analyzes and graphical visualization of the results of the performed studies. Results. It has been proven that the aluminum content in the oils of the considered deposits is inversely correlated with the following factors: concentrations of Ni, Fe, asphaltenes, the average capacity of the productive horizon, the current temperature of the productive horizons, the values of the current pressure in the productive horizons, the current depth of the productive horizons, the mineralization of the reservoir water from productive horizons, the density of formation water from productive horizons. And direct correlation with paraffin content, oil viscosity values, resin content, boiling point, V / Ni concentration ratio, total metal content, oil density values, Zn, Mn, S, Hg, Cr, V, Co concentrations. A natural classification of Dnipro-Donetsk depth deposits based on aluminum content in oils has been developed. The results of correlation and cluster analyzes were interpreted in genetic terms, which made it possible to establish a list of deposits formed by oil of abiogenic origin.