Determination method and apparatus for noble gas isotope in crude oil

Abstract

The invention relates to the field of oil gas, especially to a determination method and a determination apparatus for noble gas isotope in crude oil. According to the invention, a crude oil sample is pre-purified, and the pre-purified sample mainly comprises a noble gas component and does not pollute an instrument, thereby avoiding baking and vacuum-pumping of a system after sample determination each time and substantially increasing the utilization rate of the instrument. The pre-purified sample almost does not contain any organic component, so a background is reduced, influence of organic fragment ions on measurement results is eliminated, and accuracy of test data is improved; organic ingredients in released gas of crude oil are effectively prevented from polluting a high vacuum noble gas isotope mass spectrometer, the superposition effect of organic fragment ion peaks on a target ion peak is reduced, so isotope detection precision is effectively improved. The technological difficulty that noble gas isotope in a crude oil sample is difficult to detect is overcome. Gas-oil-source ternary noble gas isotope data comparison is realized. Accurate and reliable noble gas isotope data are provided for oil gas tracing, oil source comparison and gas source comparison.

Description

technical field [0001] The invention relates to the field of oil and gas, in particular to a method and device for measuring rare gas isotopes in crude oil. Background technique [0002] Since more than 95% of the components in the crude oil degassing gas are organic gases, they are easily adsorbed on the inner wall of the mass spectrometer and the purification pipeline, and are difficult to remove by vacuuming, resulting in low vacuum in the system, obvious background effect in the test, and organic debris Ions have a serious impact on the experimental results, and even cause errors of several orders of magnitude in the isotope ratio. Moreover, organic gases cause serious pollution to rare gas mass spectrometers that require ultra-high vacuum. It takes half a month to bake and evacuate the sample system once, and what’s more, it will cause the mass spectrometer filament to burn out, or the electron multiplier receiver Reduced sensitivity, or even failure. Therefore, in th...

AI Technical Summary

Problems solved by technology

The superposition of these ions on the target ion peak will cause a large deviation in the test results; and if the previous sample is tested and the system is not vacuumed thoroughly, the background effect will also affect the test results of the next sample

Images