ASSESSMENT OF ORGANIC MATTER CONTENT IN OIL-PRODUCING ROCKS CONTAINING TYPE II KEROGEN Russian patent published in 2022 - IPC G01N21/3563 

FIELD: mining industry.

SUBSTANCE: invention relates to the field of infrared spectroscopy and concerns a method for assessing the content of organic matter by aliphatic and aromatic fragments in sedimentary shale rocks containing type II kerogen. The method includes grinding rock samples, homogenization with potassium bromide, pressing the mixture into a tablet, measuring the optical densities of absorption bands at wave numbers 2925, 1630, 798 and in the regions of 1000-1100 and 400-500 cm^-1 of the infrared spectrum (A₂₉₂₅, A₁₆₃₀, A₇₉₈, A_1000-1100, A_400-500). The obtained data are used to calculate the content of separately aliphatic and aromatic fragments according to the following formulas: and

,

where is the content of aliphatic fragments in the sample, %, the content of aromatic fragments in the sample, %; Ai is the optical density at the wave number i cm^-1.

EFFECT: increasing the expressiveness of the method and providing the possibility of obtaining data on the structural group composition and assessment of the content of organic matter in the rocks of unconventional reservoirs.

1 cl, 2 dwg