Rapid analysis method for light hydrocarbon component in soluble organic matter of hydrocarbon source rock

Abstract

The invention relates to a rapid analysis method for a light hydrocarbon component in soluble organic matter of hydrocarbon source rock. The rapid analysis method comprises the following steps that (1) a grinded hydrocarbon source rock sample is accurately weighed and placed into a pyrolysis cup; (2) a C24D50 standard sample and a phenanthrene-d10 standard sample with known concentrations are sucked by a syringe and then added into the pyrolysis cup; (3) the pyrolysis cup is placed in a fume hood, and after standard sample solvents are completely volatilized, the pyrolysis cup is placed into apyrolysis furnace to prepare pyrolysis; (4) a multifunctional pyrolysis instrument is directly connected to a gas chromatography triple-quadrupole mass spectrometry; (5) a liquid nitrogen cold well device is started; (6) a temperature programming condition of the pyrolysis furnace is set; (7) pyrolysis begins, pyrolysis gas enters capillary column with the temperature controlled by a cold well and is enriched, and after a set pyrolysis program is finished, a GC / MS / MS analysis program is automatically started for analysis; (8) the component of a compound is determined by combining characteristic ions and relative retention time of products and searching in an NIST 11 spectral library. The method can be used for realizing rapid and accurate one-time qualitative and quantitative analysis ofsoluble organic components of the hydrocarbon source rock.

Description

technical field [0001] The invention relates to an analysis method, in particular to a rapid analysis method for soluble organic light hydrocarbon components of source rocks. Background technique [0002] The soluble organic components in source rocks contain hydrocarbon and non-hydrocarbon biomarker compounds, and these biomarker compounds are the main way to judge the depositional environment, maturity, and oil and gas migration of source rocks. Unfortunately, there is still a lack of efficient and rapid detection methods for light hydrocarbon components in source rocks. Routine detection is still through Soxhlet extraction, first using an organic solvent to dissolve the soluble organic matter, then rotary evaporation to remove the organic solvent, and then dissolving with a small amount of solvent for analysis. Due to the removal of organic solvents by rotary evaporation, the light components in the solution (less than C 11 The small molecule hydrocarbons) are completel...

AI Technical Summary

Problems solved by technology

Due to the removal of organic solvents by rotary evaporation, the light components in the solution (less than C 11 Small molecular hydrocarbon compounds) are completely taken away with the solvent volatilization, leaving only relatively large molecular weight compounds, thus losing part of the information on the organic components in the source rock, and thus cannot fully describe the source rock the nature of

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