Seabed surface sediment in-situ pore water fidelity sampler and method

A technology of surface sediment and pore water, applied in the field of marine engineering exploration, can solve the problems of poor air tightness, low resolution, high pollution of fidelity sampler, etc., and achieve the effect of reducing disturbance and increasing accuracy

Active Publication Date: 2021-03-12
GUANGDONG LAB OF SOUTHERN OCEAN SCI & ENG GUANGZHOU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the deficiencies in the prior art, one of the purposes of the present invention is to provide a fidelity sampler for in-situ pore water of seabed surface sediments, which can solve the fidelity sampling of traditional seabed shallow surface sediments in-situ airtight pore water There are problems of high pollution, low resolution a...

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  • Seabed surface sediment in-situ pore water fidelity sampler and method
  • Seabed surface sediment in-situ pore water fidelity sampler and method
  • Seabed surface sediment in-situ pore water fidelity sampler and method

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Embodiment 1

[0030] Such as Figure 1-3 As shown, a seafloor surface sediment in-situ pore water fidelity sampler includes an isolation assembly 1 for reducing the disturbance of the sediment during the sampling process, a support frame 2 and a control cabin for maintaining the stability of the sampling assembly 5, the The isolation assembly 1 includes a casing 4 with an accommodating cavity inside. Preferably, the casing 4 is made of a pressure-resistant material to avoid deformation of the casing 4 after entering the deep sea environment. Further, the casing 4 The lower end extends downwards to form an extension part, which has a shovel-like structure, so that the isolation assembly 1 can be inserted into the sampling site, and the damage to the soil environment of the sampling site during the insertion process of the isolation assembly 1 can be reduced, so as to shorten the sampling site. and the time for its surrounding environment to return to its original state; in this embodiment, a...

Embodiment 2

[0034] A method for in-situ pore water fidelity sampling of seabed surface sediments, comprising the following steps:

[0035] S1: Inject liquid into the sampling cylinder 9 in advance, so that the water pressure in the sampling cylinder 9 is at a stable value;

[0036] Specifically, enough liquid is injected into the sampling cavity of the sampling cylinder 9 in advance, so that the elastic element 8 is in a stretched state and the piston 7 is tightly attached to the end of the sampling cavity away from the elastic element 8 (that is, equal to that mentioned in the first embodiment) The volume of the spring part is the largest, and the volume of the sample part is the smallest. At this time, the water pressure in the sampling cylinder 9 is at a stable threshold.

[0037] S2: Insert the isolation assembly 1 into the sampling site, and then judge whether the external soil environment is stable, if so, open the cover plate 12, and drive the sampling hole to be in an open state, ...

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Abstract

The invention discloses a seabed surface sediment in-situ pore water fidelity sampler and method. The sampler comprises an isolation assembly, a supporting frame and a control cabin, the isolation assembly comprises a shell internally provided with a containing cavity, an opening is formed in one side of the containing cavity, the opening is covered with a cover plate, and multiple sets of sampling holes are formed in the end face of one side of the cover plate from bottom to top; the output end of each group of sampling holes is connected with a sampling assembly, each sampling assembly comprises a pore capillary tube, a guide tube and a sampling barrel, the input end of each pore capillary tube is connected with the corresponding sampling hole, each pore capillary tube is connected withthe corresponding sampling barrel through the corresponding guide tube, an energy storage module is fixed to the supporting frame body in a surrounding mode, and the lower end of the supporting framebody is connected with the upper end of the shell; and the energy storage module is connected with the sampling barrel. According to the invention, the sampling assembly samples and stores pore waterwith different depths through the sampling holes, and constructs a seabed time-serialized multi-layer pore water sample, so as to realize high-resolution three-dimensional sampling.

Description

technical field [0001] The invention relates to the field of marine engineering exploration, in particular to an in-situ pore water fidelity sampler and method for seabed surface sediments. Background technique [0002] In the accumulation area of ​​energy substances on the seabed, due to the common differences in pressure, temperature, concentration and composition in the geographical environment under the seabed, hydrocarbons will dynamically migrate from the deep to the surface, making shallow surface sediments, Geochemical characteristics in media such as pore water and bottom water 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. At present, ...

Claims

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Application Information

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IPC IPC(8): G01N1/14G01N1/34
CPCG01N1/14G01N1/34
Inventor 陈道华邓义楠陈家旺何清音孙甜甜蒋雪筱刘峪菲方玉平何巍涛程思海陈铄王荧
Owner GUANGDONG LAB OF SOUTHERN OCEAN SCI & ENG GUANGZHOU
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