Rare Earth Elements and Their Ability to Capture Changes in Borders of Hydrocarbon Saturation in Development of Oil and Gas Deposits

DOI : http://dx.doi.org/10.13005/bbra/1434

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Influence is shown of oil fluids redistribution in rare earth elements in the mineral agile complex of rocks in the section of a well by accounting shares - lanthanides balance of the mineral agile complex (MAC) related to rock embankment. Changes in concentration and redistribution of lanthanides in REE composition are considered from the perspective of the impact of oil fluids on the redox conditions in the reservoir and the change in thermodynamic conditions after start of oil and gas deposits development. The possibility has been considered of accumulating individual lanthanides in MAC and the deficit of Eu as a part of REE of an organic complex of rock in the deposit, the main reason of which is changing oxidation - and - reduction of environmental conditions and migration processes within the deposit and through its overlapping screen - top of collector. Also abnormal redistribution of individual lanthanides in REE composition is noted, the consequence of which is specifically the change in reservoir pressure and extraction of fluids from REE along with oil and gas hydrocarbons. Indicator possibilities of REE for establishing the boundaries of most oil-saturated, in fact, in the newly formed part of the deposit in the section of the exploration well have been justified by the behavior of individual lanthanides that are capable of changing valence and of accumulating or impoverishing at the borders of the reservoir deposits resulting from changes in the physico-chemical conditions in the deposit under the influence of technological processes.

oil saturation; migration; rare earth elements; complex formation and valence; ionic radius; differentiation in lanthanides behavior