Method and system for analyzing carbon circulation process at boundary of natural gas hydrate stabilization zone

Abstract

The invention belongs to the technical field of natural gas hydrate carbon circulation, and discloses a method and a system for analyzing a carbon circulation process at a boundary of a natural gas hydrate stabilization zone. On the basis of methods for seismic interpretation, numerical simulation, hydrate decomposition amount calculation, coral reef fixed carbon content calculation and the like,the carbon circulation process at the boundary of the hydrate stabilization zone is quantitatively evaluated. The amount of methane entering seawater is estimated by calculating the amount of free gasreleased by hydrate decomposition and the fixed carbon content of cold-water coral reefs, so that the carbon circulation process in lithosphere, biosphere, hydrosphere and atmosphere at the boundaryof the hydrate stabilization zone is fully recognized, the effect of a natural gas hydrate system in a global carbon circulation system is quantitatively and accurately evaluated, and people is helpedto correctly understand the influence of hydrates on the environment, the climate changes and the like.

Description

technical field [0001] The invention belongs to the technical field of natural gas hydrate carbon cycle, and in particular relates to a method and system for analyzing the carbon cycle process at the boundary of a natural gas hydrate stable zone. Background technique [0002] Currently, the closest prior art: [0003] Gas hydrates store a large amount of methane and other hydrocarbon gases, and their estimated geological reserves exceed the sum of known land natural gas geological reserves in the world. The gas hydrate in the sea area is located in the shallow layer of the sediment. Affected by ocean currents, sedimentation, diapirism, etc., the gas hydrate stable bottom boundary (Base of Gas Hydrate Stability Zone: BHSZ) is prone to vertical migration, resulting in the decomposition of gas hydrate. It is generally believed that the gas hydrate stability zone GHSZ on the submarine slope is a wedge-shaped body that thickens toward the sea. The landward limit of Gas Hydrate ...

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Problems solved by technology

[0009] The carbon cycle process that occurs at the boundary of the gas hydrate stable zone is a dynamic process, and the bottom boundary of the hydrate stable zone migrates vertically with geological processes, such as deposition, denudation, sea level rise and fall, and subsurface heat flow anomalies, so it is difficult to restore and reconstruct The vertical migration process of the hydrate stable bottom boundary in the past

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