Calculating method and detection device of seafloor in-situ thermal conductivity

Abstract

The invention provides a calculating method and a detection device of seafloor in-situ thermal conductivity, and belongs to the technical field of seafloor in-situ heat flow detection. The calculating method comprises the following steps: detecting gestures and moving conditions of a probe in the sea floor by using a gesture detection module, and then controlling a heat pulse control module to excite heat pulses by using a main control module to perform electric heating on heating wires of the probe at the front end of a measuring unit; synchronously, controlling a temperature acquisition module to acquire temperature data of submarine sediments by using the main control module, and then outputting the temperature data to a PC machine; and establishing a finite element TC_FE numerical model by virtue of the PC machine, and performing parameter inversion by using a mesh encryption search method. According to the calculating method and the detection device of the seafloor in-situ thermal conductivity provided by the invention, by adopting the gesture detection module, the seafloor arrival conditions can be judged and automatic heat pulse control can be performed; meanwhile, the in-situ environment temperature and in-situ thermal conductivity of the submarine sediments can be acquired, and the offshore operation safety and seafloor detection efficiency can also be greatly improved; and by establishing an in-situ thermal conductivity numerical inversion method, the limitation of analytical solutions of a simplified model depended by in-situ thermal conductivity solution can be eliminated.

Description

technical field [0001] The invention belongs to the technical field of seabed in-situ heat flow detection, and in particular relates to a method for calculating seabed in-situ thermal conductivity and a detection device thereof. Background technique [0002] As an important branch of geophysics, geothermology is a subject with strong foundation and applicability, and the measurement of terrestrial heat flow is the most basic means to obtain the parameters of the earth's thermal state, and it is also the most critical link in geothermal research. The main sources of seafloor heat flow parameters are borehole temperature measurement data (such as oil and ocean drilling boreholes) and seafloor heat flow probe measurements. Since the early 1980s, many scholars have used the bottom-like reflector (BSR) revealed in gas hydrate exploration to estimate seabed heat flow. Since the oil drilling holes are mainly located in shallow water areas (for example, the oil drilling holes in th...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a method for calculating the in-situ thermal conductivity of the seabed and its detection method in consideration of the particularity of seabed heat flow detection, the safety, high efficiency and convenience of actual offshore operations. The device overcomes the shortcomings of the Ewing type probe that cannot directly measure the in-situ thermal conductivity and the longer measurement time of the Lister type probe that is not conducive to offshore operations. Thermal conductivity

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