Method for measuring gas saturation of gas hydrate

Abstract

The invention discloses a method for measuring the gas saturation of a gas hydrate, which comprises the following steps that dimensionless treatment is performed on peak intensity integration of characteristic peaks of gas molecules in the hydrate by taking the characteristic peaks of water molecules in the gas hydrate as reference peaks; namely, the ratio of the peak intensity integral of the characteristic peak of the gas in the hydrate to the peak intensity integral of the characteristic peak of the water molecule in the hydrate is calculated, and the relative peak intensity integral of thecharacteristic peak of the gas molecule in the hydrate is obtained; meanwhile, the gas saturation of the hydrate is quantitatively calculated by means of macroscopic measurement, a function of relative peak intensity integration of characteristic peaks of gas molecules in the hydrate to the gas content in the hydrate is established, and the gas saturation of the gas hydrate is calculated. The problem that the gas saturation of the gas hydrate cannot be rapidly and accurately measured for a long time in the field of gas hydrate research is solved, and the method has important significance in research in the aspects of rapid quantitative measurement of the gas saturation of the natural gas hydrate, evaluation of gas reserves in natural gas hydrate reservoirs and the like.

Description

technical field [0001] The invention relates to the field of hydrate physical property measurement, in particular to a method for measuring gas saturation in gas hydrate. Background technique [0002] Gas hydrates are non-stoichiometric cage-like crystalline substances formed by water and small molecular gases such as methane, carbon dioxide, and nitrogen. As a new type of clean energy, natural gas hydrates are widely distributed in the submarine continental shelf or plateau permafrost under high pressure and low temperature conditions. Its huge reserves all over the world make it an important alternative energy source and is widely valued by countries all over the world. [0003] Gas hydrates widely exist in nature mainly include type I, type II and type H. The crystal structure of hydrate is mainly determined by the gas composition and concentration in the hydrate. At the same time, the gas saturation in the hydrate is also closely related to its environment, for exampl...

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Problems solved by technology

However, the position deviation of the laser measuring point will bring significant deviation to the characteristic peak intensity of the Raman spectrum of the hydrate. Therefore, the integrated area of ​​the Raman characteristic peak intensity of the gas in the hydrate phase cannot be directly applied to the hydrate phase. Calculation of the gas saturation of the substance

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