In-situ real-time monitoring device and in-situ real-time monitoring method for hydrate-induced seabed instability

Abstract

The invention discloses an in-situ real-time monitoring device and method for hydrate-induced seabed instability, and belongs to the field of marine geological detection. The device comprises a test feeler lever, wherein a plurality of electrode rings and a plurality of pore pressure sensors are arranged on the test feeler lever; the bottom of the test feeler lever is a conical head; a counterweight, an underwater acoustic communication machine I, an acquisition control bin, a power supply bin and a lifting ring are fixedly arranged at the upper part of the test feeler lever; a resistivity acquisition unit, a pore pressure acquisition unit and a lower computer control unit are arranged in the acquisition control bin; the resistivity acquisition unit is respectively in communication connection with each electrode ring and the lower computer control unit; and the pore pressure acquisition unit is respectively in communication connection with each pore pressure sensor and the lower computer control unit. The change of the excess pore water pressure obtained through resistivity calculation and the change of the excess pore water pressure measured by the pore pressure sensor are maximized, the possibility of seabed instability is judged according to the maximum value, and then seabed geological disasters are monitored and early warned.

Description

technical field [0001] The invention relates to the field of marine geological exploration, in particular to an in-situ real-time monitoring device and method for hydrate-induced seabed instability. Background technique [0002] Gas hydrate is a new unconventional alternative energy source, most of which are located in shallow sediments on deep-water continental shelves. Decomposition of hydrate (1m 3 Natural hydrate solid decomposition produces about 164m 3 methane gas and 0.8m 3 water) will lead to an increase in sediment pore water pressure and a decrease in effective stress, which can easily induce submarine landslides and other submarine instability, and then trigger tsunamis, threatening the safety of human production and life. [0003] At present, the exploitation of natural gas hydrate is in full swing around the world. The United States, Japan, and China have all conducted hydrate exploitation. However, the in-situ monitoring of hydrate exploitation is limited to...

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Problems solved by technology

[0003] At present, the exploitation of natural gas hydrate is in full swing around the world. The United States, Japan, and China have all conducted hydrate exploitation. However, the in-situ monitoring of hydrate exploitation is limited to temperature, pressure, and methane concentration. Apparatus and method for monitoring hydrate-induced seafloor instability

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