深海甲烷电化学原位长期监测技术及其在海洋环境调查和天然气水合物勘探中的意义

doi:10.11720/wtyht.2019.1250

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Abstract

The continuous acquisition of dissolved methane concentration data in the deep sea has important scientific significance and practical application value for dynamic monitoring of marine environment and methane diffusion in gas hydrates development. This paper introduces key technologies of electrochemical in-situ long-term monitoring technology for deep sea methane in detail, which include the technical ideas of "seawater degassing, quantitative injection of gas samples, and high-precision electrochemical detection", the technical method of "sea water circulation controlled by supercharged drainage system, decompressed steady flow, gas-liquid separation, and improvement of high precision detection technology for hydrocarbon components". Based on the long-term monitoring experiment data obtained from bottom water in Jiaozhou Bay during 94 days, the authors studied and evaluated the technical performance, data quality and geological effect of the in-situ sensors. Some conclusions have been reached: (1) In-situ sensor has an index range of 0.01~10 000 nmol/L and sensitivity reaches 0.01 nmol/L. It has good stability and selectivity for the detection of hydrocarbon components; (2) The range of dissolved methane in the monitoring area is 19.01~106.87 nmol/L, the normal methane background is 32.41 nmol/L, and the local anomalous methane background is 80.60 nmol/L. These data show that abnormality is related to sewage discharge and seawater pollution; (3) The results of measured methane data are consistent with those obtained from previous investigation and study of seawater environment in Jiaozhou Bay, which proves that the measured data are objective and scientific; (4) The sea trial monitoring results show that the in-situ sensor is reliable in testing, reasonable in structure design and scientific in design ideas, and it basically has the capability for acquiring seawater methane concentration data in marine scientific investigation. It has practical application value and scientific significance in the dynamic monitoring of methane diffusion and long-term monitoring of deep sea methane concentration during the development of marine gas hydrate in the future.

Key words： deep-sea environment long-term monitoring methane in-situ sensor seawater methane concentration marine gas hydrate Jiaozhou Bay

Received: 25 June 2018 Published: 20 February 2019

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	Chun-Yan SUN
	Dong-Lin WANG
	Shi-Qiang ZHANG
	Hui-Ce HE
	Hao ZHAO
	Fan LING
	Wen-Bin YIN

Cite this article:

Chun-Yan SUN,Dong-Lin WANG,Shi-Qiang ZHANG, et al. Deep sea methane electrochemical in-situ long-term monitoring technology and its significance in the ocean environmental investigation and gas hydrate exploration[J]. Geophysical and Geochemical Exploration, 2019, 43(1): 1-16.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1250 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I1/1

The simple working principle of deep-sea dissolved methane in-situ long-term monitoring instrument

The overall structure and main components of deep-sea dissolved methane in-situ long-term monitoring instrument

Interior installation layout and physical drawings of deep-sea dissolved methane in-situ long-term monitoring instrument
a—side view and top view;b—physical drawings:c—layout of components

Interior layout plan (a) and physical map (b) of the drainage tank

Waste pool appearance (a) and interior (b) design

Design of waste liquid pool and liquid probe parameters

Automatic control design of drainage system

Structure design of pressurized drainage pump

Overall installation of the drainage system

The displacement, current and power of drainage pump under different pressure

The power (left) and the displacement (right) of drainage pump with the change of pressure

Degassing efficiency of the degassing system at 5 mL/min

Technical indexes of optimal chromatographic column

Spectral peak curve of separation of methane, ethane and propane

Schematic diagram of power supply structure

Schematic diagram of system integration control

Work interface of gaseous hydrocarbon detection software

Sensors and gas chromatography parallel experimental data comparison

Sensor reproducibility test data

The comparison chart of test data from in-situ methane sensor and gas chromatograph

The situation of sea trial of Qingdao Marine experimental station in Shandong Province
a—shore monitoring platform;b—instrument for launching and release

The distribution diagram of the dissolved methane concentration effective data in the monitoring point seawater (The straight line is segments which eliminated the fault data)

The daily mean data distribution of dissolved methane concentration in the monitoring point seawater

A comparison chart of the dissolved methane concentration in seawater by in-situ sensor and laboratory test

Comparison between the daily average value of the monitoring point sensor test and the same time point of the laboratory test sample dissolved seawater methane concentration

Test data of dissolved methane concentration in sea trials and distribution of methane concentration in seawater in Jiaozhou Bay

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