A method and system for analyzing the carbon cycle process at the boundary of the natural gas hydrate stabilization zone

Abstract

The invention belongs to the technical field of natural gas hydrate carbon cycle, and discloses a method and system for analyzing the carbon cycle process at the boundary of a natural gas hydrate stable zone, based on seismic interpretation, numerical simulation, calculation of hydrate decomposition amount, coral reef carbon fixation amount calculation, etc. method to quantitatively assess the carbon cycle process at the boundary of the hydrate stability zone. The present invention estimates the amount of methane entering seawater by calculating the amount of free gas released by hydrate decomposition and the carbon fixation amount of cold-water coral reefs, so as to fully understand the boundary of the hydrate stable zone, which occurs in the lithosphere-biosphere-hydrosphere-atmosphere In order to quantitatively and accurately evaluate the role of natural gas hydrate system in the global carbon cycle system, and help people correctly understand the impact of hydrate on the environment and climate change.

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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