Аннотация:The article considers correlations between the trace element composition of oils from the fields of Tatarstan and Western Siberia and the chemical composition of the Upper, Middle and the Lower crust and biota. The factual basis of the correlation calculations is a database compiled from a large number of analyzes by different authors. The results of the study quantitatively confirm the earlier conclusions about the polygenic source of trace elements in naphthides. The nature of the change in the correlation dependences of the trace element composition of naphthides is shown – from the initial organic matter to oils and natural bitumens. In certain oil and gas basins, a higher correlation of the trace element composition of oils with the compositions of the Lower or Middle crust, but not with the Upper one testifies for the involvement of deep-seated deposits in the oil generation processes, which increases the predictive estimates of the possibility of identifying mega-reservoirs of oil and gas at great depths.
