A sediment pore water sampling system and its sampler

Abstract

The invention discloses a sediment pore water sampler, which includes a sampling component, a pore water accommodating component, a fixed frame and a limit component. The sampling conduit in the sampling component can be inserted into the sediment. The seepage hole enters the inner cavity of the plunger cylinder through the sampling catheter. When the pore water fills the inner cavity of the plunger cylinder, the first piston moves downward, and the pore water enters the accommodating cavity through the communication channel under the action of pressure, and the accommodating cavity stores water. After completion, the pore water containing component moves upwards, and the pore water containing component and the plunger cylinder slide relative to each other until the pore water containing component is separated from the plunger cylinder, and a new round of pore water can be performed after replacing the pore water containing component. Water sampling is used to obtain long-term data flow of sediment pore water at one point; and it avoids the disturbance caused by reciprocating entry to the sediment and improves the purity of sample collection. The invention also provides a sediment pore water sampling system, which includes a buoy, a cable and the above-mentioned sampler.

Description

technical field [0001] The invention relates to the technical field of pore water sampling equipment and its surrounding supporting facilities, in particular to a sediment pore water sampling system and a sampler thereof. Background technique [0002] In gas hydrate accumulation areas, due to the common differences in pressure, temperature, concentration and composition in the underground environment, hydrocarbons will dynamically migrate from the deep to the surface, making shallow surface sediments, pore water and bottom water, etc. The geochemical characteristics in the medium change, forming geochemical anomalies. Among them, the methane seepage, pH value, redox potential and various chemical composition changes at the seawater-sediment interface are important evidences for gas hydrate exploration and marine environment changes, but related fidelity sampling, testing technology and geological environment system evolution Research is relatively weak. The research and de...

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Problems solved by technology

[0003] In the prior art, after the sediment pore water sampler completes one sampling, the sampling mechanism needs to be pulled out, and re-enter the sediment when re-sampling, so long-term multiple sampling at the same point cannot be performed, and the sampling efficiency is low; and again When entering the sediment, it will disturb the sediment and reduce the purity of the collected sample

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