Detection method of nitrogen-containing compound from rock extract

Abstract

The invention relates to a detection method of a nitrogen-containing compound from a rock extract. The detection method comprises the following steps of (1) pre-treating a rock sample to obtain the rock extract; (2) carrying out family component separation on the rock extract, separating and collecting of nitrogen-containing compound fraction, and concentrating the nitrogen-containing compound fraction to use as a to-be-detected sample; (3) preparing a carbazole standard solution and 9-phenyl-carbazole standard solution, measuring a mass chromatogram by using comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry to obtain standard curves of the both; and (4) detecting the to-be-detected sample by using the comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry, qualitatively analyzing the nitrogen-containing compound in the to-be-detected sample according to a retention time and characteristic ions, and quantitatively analyzing the nitrogen-containing compound in the to-be-detected sample. The comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry analysis method of the nitrogen-containing compound in the rock extract overcomes the interference problems of overlapping peaks in conventional GC/MS chromatogram; and the qualitative and quantitative results are accurate and reliable.

Description

technical field [0001] The invention belongs to the field of chemical composition analysis and research of petroleum samples, and relates to a detection method for nitrogen-containing compounds in rock extracts. Background technique [0002] In the process of oil and gas exploration, the high-sensitivity detection of nitrogen-containing compounds has important guiding significance. Especially carbazole nitrogen-containing compounds (including carbazole, methylcarbazole series, dimethylcarbazole series, trimethylcarbazole series and other compounds), because of their special molecular structure, they have significant oil and gas migration fractionation effect, which can be used as an important tracer indicator of oil and gas migration. In recent years, the application of nitrogen-containing compounds to study the primary and secondary migration of petroleum has become a hot topic at home and abroad. [0003] However, due to the extremely low content of nitrogen-containing c...

AI Technical Summary

Problems solved by technology

However, when analyzing actual samples, due to the great difference in geological conditions, the content of carbazole compounds in many samples is extremely low, and the interference of aromatic hydrocarbon compounds and other polar components is unavoidable, resulting in inaccurate qualitative and quantitative results

At present, the qualitative number of nitrogen-containing compounds is very limited, only carbazole, methylcarbazole, dimethylcarbazole and benzocarbazole have been qualified, and the detection of other nitrogen-containing compounds needs to be further studied

Images