Device and method for testing water binding capacity parameter and pore water distribution characteristic of methane-containing hydrate sediments

Abstract

The invention provides a device and a method for testing water binding capacity parameters and pore water distribution characteristics of methane-containing hydrate sediments. The device comprises a pressure chamber, a thermostatic bath I, a low-field nuclear magnetic resonance spectrometer, a pressure supply system, a gas supply system, a constant-speed constant-pressure injection pump and a data acquisition system. The method comprises the following steps: applying air pressure to a sample in a pressure chamber by using nitrogen under high-pressure and low-temperature conditions, reflecting the change trend of pore water by using a low-field nuclear magnetic resonance spectrometer, controlling and measuring the suction force of the sample containing methane hydrate by using an axial translation method, and according to the collection of the water yield of the sample by a data collection system, judging suction balance, calculating the water content of the sample under the suction, and obtaining a soil-water characteristic curve of the methane hydrate-containing soil and the pore water distribution state under each stage of suction, so that the water binding capacity parameter research of the methane hydrate-containing sediment is realized, the principle conforms to a hydrate forming mode and mining working conditions, and the device is simple in structure, and equipment can be provided for most scientific research and design units.

Description

technical field [0001] The invention relates to the technical field of testing the physical properties of materials, in particular to a testing device for water-holding parameters and pore water distribution characteristics of methane hydrate-containing sediments. Background technique [0002] Methane hydrate (commonly known as combustible ice) is a kind of ice-like, non-stoichiometric cage-like crystalline compound formed by methane and other gas molecules being sucked into the gaps of the cage-shaped water molecule structure under certain pressure and temperature conditions. Distributed in the seabed sediments and permafrost in the continental margin continental slope, it has the characteristics of high combustion value, high energy, clean and pollution-free. [0003] As a new type of clean energy, methane hydrate will lead to engineering problems such as submarine landslides and ground subsidence if improperly exploited, and will also release greenhouse gases that will le...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems in the prior art about the inability to simulate the seabed environment and inaccurate measurement results in the testing device for the water holding capacity parameters of methane hydrate sediments, the technical solution of the present invention is as follows:

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