The invention belongs to the technical field of oil and
gas formation and particularly relates to
carbonatite oil and gas reservoir
pyrite rubidium-
strontium isotope chronology. The method comprises ten steps of selection of a dating object, preparation of a sample, cleaning of the sample,
drying of the sample, weighing and dissolving of the sample,
drying and re-dissolving of the sample, chemicalseparation, treatment of component solutions, determination of isotopic compositions, and analysis and comparison. The
carbonatite oil and gas reservoir
pyrite rubidium-
strontium isotope chronology in the invention is combined with an Rb-Sr
chronology and research for the radioactivity and stable isotopes, and a method for determining the
carbonatite reservoir oil and
gas formation time is provided. According to the method disclosed by the invention, the sample amount used for single analysis is 1 / 10 to 1 / 100 the sample amount for
conventional analysis, the use amount of the sample is extremely small, the sampling frequency is greatly reduced, the
workload is reduced, and the analysis time is shortened.