On-line monitoring system and monitoring method for trace hydrogen escaping from faults for seismic observation

Abstract

The invention relates to a fault escaped trace hydrogen gas on-line monitoring system and a monitoring method used for earthquake observation. The fault escaped trace hydrogen gas on-line monitoring system comprises an on-site gas collection pre-treatment device, a first solenoid valve, a second solenoid valve, a sampling pump, a quantification tube, a gas separation column, a hydrogen detection device, a tail gas treatment device, a circulating gas pump, and a master control circuit; a gas inlet of the on-site gas collection pre-treatment device is arranged is used for covering a fault observation hole; the on-site gas collection pre-treatment device, the first solenoid valve, the quantification tube , the second solenoid valve, the sampling pump, and a gas outlet are connected successively; the first solenoid valve is connected with the second solenoid valve through the gas separation column, the hydrogen detection device, the tail gas treatment device, and the circulating gas pump;the first solenoid valve, the second solenoid valve, the sampling pump, the circulating gas pump, and the hydrogen detection device are connected with the master control circuit respectively. The fault escaped trace hydrogen gas on-line monitoring system is simple in operation, is capable of realizing on-site hydrogen detection continuously and automatically, is excellent in timeliness, is high insensitivity and accuracy, is suitable for field fault observation environment, and is capable of satisfying earthquake precursor observation requirements.

Description

technical field [0001] The invention relates to a method and equipment for observing underground fluid gas of earthquake precursors in the field of geochemistry, in particular to an on-line monitoring system and method for monitoring trace hydrogen released from faults for earthquake observation. Background technique [0002] Faults are a good channel for the migration and escape of gas inside the earth. The creep, dislocation and rupture of faults are the cause of earthquakes, and at the same time, they will cause the internal gas to migrate to different degrees. The content of hydrogen in the surface air is only 0.5-1ppm, but there is a large amount of hydrogen in the deep part of the earth, which exists in the state of adsorbing dissolved hydrogen and hydrocarbons, and is mainly discharged through rocks and soils in fault zones, or with the deep circulation of the earth. The hot water is carried and released through the hot spring dew point. Faults will slip under the ac...

AI Technical Summary

Problems solved by technology

[0005] 1. Low precision, unable to distinguish trace hydrogen concentration in the air

The hydrogen concentration on the surface is generally low, about 0.5-1ppm. Existing observation techniques generally cannot accurately detect trace hydrogen concentrations below 10ppm, which has a great impact on the background observation of earthquake precursor fault outgassing observations.

[0006] 2. The existing monitoring system has a low degree of automation and many human factors

The change of the gas escaping from the earthquake precursor fault changes with the underground activities. Only continuous observation can help to discover the changes of underground activities. However, the existing monitoring system cannot make continuous observations, but can only be realized after manual sampling and transportation. observation, so there will be a large error

[0007] 3. The fault gas acquisition method is susceptible to environmental interference, resulting in large fluctuations in observed values, making it impossible to distinguish seismic anomalies

Modern human activities and life have a great impact on earthquake observation, which can easily cause changes in the observation environment and lead to abnormal increases in observation values, which bring many difficulties to the observation and analysis of earthquake precursors

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