Gas sampling bottle and gas isotope analysis system and method

Abstract

The invention discloses a gas sample introduction bottle and a gas isotope analysis system and method.The gas sample introduction bottle comprises a bottle body, at least one outlet is formed in the bottle body, a first valve is arranged on the outlet, and the outlet is used for being connected with a trace gas pre-concentration device; a first opening of the four-way pipeline is communicated with the bottle body, a second opening of the four-way pipeline is connected to a pressure vacuum meter, a sealing piece is plugged on a third opening of the four-way pipeline, a second valve is arranged on a fourth opening of the four-way pipeline, and the fourth opening is used for being connected with a vacuumizing system. According to the invention, large-volume sample introduction is realized, so that the carbon isotope of low-concentration methane in a geochemical exploration sample can be detected, the operation is simple and convenient, and a reliable technical means is provided for the application of a surface oil gas geochemical exploration technology.

Description

technical field [0001] The invention belongs to the field of oil and gas exploration, and more specifically relates to a gas sampling bottle, a gas isotope analysis system and a method. Background technique [0002] Micro-leakage of hydrocarbons in oil and gas reservoirs to the surface is inevitably transformed by near-surface microorganisms, including microbial gas generation (δ 13 C 1 lighter) and microbial hydrocarbon phagocytosis (δ 13 C 1 become heavier). Hydrocarbons of different stages and origins not only have certain differences in composition (for example, hydrocarbons produced by surface biogeochemical processes are represented by CH 4 main, poor 13 C; The content of heavy hydrocarbons in deep oil and gas is relatively large and relatively enriched 13 C), the sequence of entry into the soil and the presence of hydrocarbon-water-soil interactions are different. [0003] In surface oil and gas exploration, identification and evaluation of near-surface geochem...

AI Technical Summary

Problems solved by technology

The carbon isotope method in geochemical exploration is mainly used for the analysis of free hydrocarbons, headspace and physically adsorbed hydrocarbons, and methane stable carbon isotopes in the method of acidolysis hydrocarbons. It is a very important index for exploration. However, except for the concentration of acidolysis gas in some areas, which can be detected directly with a micro-syringe, the concentration of other indicators is very low, and it is almost impossible to achieve the required accurate detection of isotopes. concentration

The existing Thermo Fisher precon can detect the carbon isotope of methane in the atmosphere, but its atmospheric sampling tube is not suitable for the detection of geochemical exploration samples, and the volume of free gas, headspace, physical adsorption gas, acidolysis gas, etc. Between 50ml, the methane concentration is higher than the methane concentration in the atmosphere. The samples are sealed in sample bottles, and the sample quantity is large. The analysis of carbon isotopes in these sample gases is difficult.

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