Continental margin hydrate environment geology dynamic monitoring system and method
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A dynamic monitoring and hydrate technology, used in surveying, earth-moving drilling, and fluid extraction
Active Publication Date: 2020-06-05
QINGDAO INST OF MARINE GEOLOGY
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[0005] Aiming at the defects of the existing technology that it is difficult to accurately evaluate the environmental risks in the process of gas hydrate resource exploration and development, the present invention proposes a dynamic monitoring system and method for hydrate environment and geology at the continental mar
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Embodiment 1
[0028] Embodiment 1, a kind of continental margin hydrate environmental geological dynamic monitoring system, such as figure 1 As shown, 1 is a hydrate reservoir, because its shallow part is affected by bottom water temperature and tidal fluctuations, earthquakes and self-weight, it often decomposes, and a weak layer in the formation, that is, a potential landslide line 2, has the potential to occur The risk of landslides, in order to monitor the deep deformation and trend development of potential landslides, is mainly based on the following technologies:
[0029]The monitoring system includes an inclinometer unit, a free methane monitoring unit, a seawater environment parameter monitoring unit, a data acquisition unit 10 and an in-situ data receiving unit; the inclinometer unit and the free methane monitoring unit are arranged along the landslide line 2, and the inclinometer unit It is used to monitor the deep deformation degree of the landslide body, to use the deformation m...
Embodiment 2
[0036] Embodiment 2. Based on the dynamic monitoring system for environmental geology of hydrates at the continental margin disclosed in Embodiment 1, this embodiment proposes a corresponding monitoring method, which includes the following steps:
[0037] (1) Determine the landslide line according to the location of the survey target. In the actual investigation, use the special structure (landslide step 17) on the seabed micro-topography and combine the fractures interpreted on the shallow strata section to determine the actual landslide line. Location;
[0038] (2) vertically drill a hole on the landslide mass of the investigation target position, the bottom of the borehole passes through the landslide line, and lay an inclinometer unit for monitoring the deep deformation degree of the landslide mass in the borehole;
[0039] During specific implementation, the appropriate position where the landslide step 17 occurs on the landslide body is drilled vertically, and the lower ...
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Abstract
The invention discloses a continental margin hydrate environment geology dynamic monitoring system and method. The method comprises the steps of monitoring the dissolved methane flux, the dissolved oxygen content, the pH value, the Eh value and other parameters of a leakage source in a water body on the basis of a seabed multi-parameter sensor technology; monitoring the free methane flux leaked ina bubble plume mode by combining an ultrasonic flowmeter; based on a distributed optical fiber technology, monitoring the stress and strain of a potential unstable slope, so that comprehensive monitoring of landslide and environmental changes for the slope with natural gas hydrate existing on a continental margin is achieved; and through the establishment of a small-scale submarine observation network, unified power supply and data acquisition, monitoring the dynamic activity of a hydrate reservoir and the resulting environmental effects, so that the in-situ, long-term and continuous monitoring and early warning capabilities are formed, the mechanism and rules of geological hazards possibly induced by hydrates are mastered, technical support is provided for the hydrate exploitation process, the practical value is high and implementability is high.
Description
technical field [0001] The invention belongs to the technical field of marine natural gas hydrate environmental effect evaluation engineering, and in particular relates to a dynamic monitoring system and method for environmental geological disasters caused by continental margin hydrates. Background technique [0002] Natural gas hydrates (hereinafter referred to as "hydrates") are widely distributed in the seabed of the world, accounting for more than 10% of the entire ocean area, and the continental margin is the most abundant location of hydrates. There is already established evidence that ongoing anthropogenic or natural processes can cause hydrate dissociation, triggering submarine slides at many points along the continental margin. [0003] The mechanism by which hydrates contribute to submarine landslides is that if exposed to lower pressure and / or higher temperature conditions, hydrates dissociate, which can lead to disturbance of less compacted sediments and trigger ...
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