System for quantificationally collecting trace gas in rock group inclusion and use method thereof

Abstract

The invention discloses a system for quantificationally collecting trace gas in a rock group inclusion and a use method thereof, pertaining to the experimental field of geochemical investigation field. The system consists of a rock sealing and milling unit, a trace gas transfer unit and a trace gas metering unit, wherein a gas storage metering tube 503 and a water storage tube 504 in the trace gas metering unit are made of glass and a gas extraction screw nut 502 is made of organic glass and other plastics; the gas storage metering tube 503 has small inside diameters, uniform upper and lower inside diameters and the maximum internal volume of 500 microliters or 1,000 microliters, and the external of the gas storage metering tube is provided with scales (the measuring unit is microliter); the center section of the water storage tube 504 takes the shape of a drum; and a sealing gasket 501 is a solid cylindrical plate made from silastic. The invention solves the problems that trace gas can not be taken for analysis in a closed container under a low negative pressure status, transfer collection is uncompleted, gas is inconvenient to be taken for analysis and sequent quantitative and qualitative analyses on a plurality of items can not be carried out simultaneously in the prior art.

Description

technical field [0001] The invention relates to an experimental device in the field of geochemical research, in particular to an experimental device for airtight transfer, quantitative collection and preservation of trace gases in rock group inclusions by means of electronic machinery. Background technique [0002] In the exploration and development of oil and gas, the use of the geochemical characteristics of the gas contained in the inclusions of rock groups is an important means to further study the generation, preservation, migration and storage of oil and natural gas. Since the inclusions themselves are quite small in size and contain very little gas—belonging to the category of trace and trace amounts, how to accurately transfer, collect, and quantitatively store the extremely small amount of gas released after the fragmentation of the inclusions in rock groups for chromatography and mass spectrometry Qualitative and quantitative analysis of , isotope and other items h...

AI Technical Summary

Problems solved by technology

During this repeated inhalation and exhaust process, under vacuum negative pressure, a small amount of mercury vapor will inevitably enter the gas collection chamber 205 together with the transferred gas, and under vacuum, the natural evaporation of mercury will also reduce the pressure in the vacuum chamber. The degree of vacuum will inevitably affect the transfer of trace gases, resulting in incomplete transfer of trace gases

At the same time, mercury is a poisonous and harmful substance, which not only endangers the physical and mental health of operators and analysts, but also pollutes the environment.

In addition, because the residual gas in the pipeline between the vacuum chamber 214 and the vacuum valve 218 cannot be collected, but the inner volume of the pipeline is much larger than the inner volume of the gold tube 219, it will also cause incomplete gas collection.

Images