In-situ detection method of stratal hydrothermal parameters

Abstract

The invention discloses an in-situ detection method of stratal hydrothermal parameters. The in-situ detection method disclosed by the invention comprises the following steps: measuring temperature of stratums at various monitored points by using a three-pin compound probe, controlling a middle probe of the three-pin compound probe to emit thermal pulse by a CPU of a detection apparatus, simultaneously, collecting the temperature value of a lower probe of the three-pin compound probe and the corresponding time, collecting all temperature value data measured by the lower probe within 80s after emitting thermal pulse, intercepting data within 20s-75s, and calculating the heat conductivity of the stratum by utilizing an embedded heat conductivity processing program by the CPU; obtaining the water content of the stratums at various monitored points by utilizing an empirical formula between the water content and the heat conductivity; and measuring temperature difference to obtain the temperature difference value delta T at the upper and lower probes of the three-pin compound probe, and processing by using data fitting inversion software so as to obtain a permeability velocity value of stratum water parameters at the monitored points. The in-situ detection method disclosed by the invention is high in measurement precision, high in practicability and low in monitoring cost.

Description

technical field [0001] The invention belongs to the fields of hydrogeological method monitoring (including geothermal) and ground source heat pumps, and all other fields requiring stratum hydrothermal parameters, and particularly relates to an in-situ detection method of stratum hydrothermal parameters. Background technique [0002] The thermal parameters of the formation include parameters such as the temperature and thermal conductivity of the formation, and the parameters of the formation water include water content and seepage velocity. It is of great significance to find out the distribution of thermal parameters in various strata and the law of water migration in many fields such as environmental geology, hydrogeology, and soil science. Due to the huge spatial and temporal variability of formations, even for formations with the same texture and uniform mineral composition, their thermal conductivity and seepage velocity change with the change of water content. The com...

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Problems solved by technology

[0004] In the ground source heat pump system, if you want to know the hydrothermal parameters of the formation, you are simulating the working condition of heat dissipation to the ground, and calculating the thermal conductivity and specific heat energy of the formation, not only does not consider many influencing factors, but also calculates a certain The average value of each formation within a certain depth of the hole cannot obtain the parameter value of a single formation, resulting in an incorrect calculation of the heat release (cold absorption) capacity of the formation

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