METHOD FOR QUANTITATIVE DETERMINATION OF PYRITE SULFUR AND ORGANIC SULFUR IN ROCK SAMPLE Russian patent published in 2022 - IPC G01N31/12 

FIELD: oil industry.

SUBSTANCE: method for the quantitative determination of pyrite sulfur in a sedimentary rock sample is disclosed, in which at least following stages are carried out: A) heating of the specified sample in inert atmosphere to a temperature in the range from the first temperature from 100 to 320°C to the second temperature from 600 to 700°C, in accordance with the first temperature gradient ranging from 1 to 30°C/min; B) continuous oxidation of at least part of fluxes leaving the specified heating of the specified sample in inert atmosphere, continuous measurement of the first amount of released SO₂, depending on the duration of the specified heating in inert atmosphere, and determination of at least a pyrolysis sulfur content and a pyrolysis pyrite sulfur content, based on the specified first amount of SO₂; C) heating in oxidizing atmosphere of the residue of the specified sample obtained as a result of the specified heating in inert atmosphere to a value between the third temperature, which is from 280 to 320°C, and the fourth temperature, which is greater than or equal to 800°C, in accordance with the second temperature gradient, which is from 1 to 30°C/min; D) continuous measurement of the second amount of released SO₂, depending on the duration of the specified heating in oxidizing atmosphere, determination of at least an oxidation sulfur content from the specified second amount of SO₂, and determination of at least the total sulfur content as the sum of the specified pyrolysis sulfur content and the specified oxidation sulfur content, while determining at least a content of pyrite sulfur S^Pyrit contained in the specified sample, using , which is a weight function depending on a parameter α, which is a fraction of the specified pyrolysis pyrite sulfur from the specified total sulfur, a parameter β reflecting the influence of a mineral matrix on the specified fraction, a parameter γ reflecting the influence of an organic matrix on the specified fraction, wherein values of the specified parameters are set in advance.

EFFECT: invention provides fast, simple and accurate separate quantitative determination of pyrite sulfur and organic sulfur.

16 cl, 11 dwg