High-temperature geothermal field comprehensive geophysical exploration system and geothermal sweet spot area evaluation method

Abstract

The invention provides a high-temperature geothermal field comprehensive geophysical exploration system and a geothermal sweet spot area evaluation method. Large-area infrared remote sensing measurement and radioactive measurement are carried out, and three-component seismic longitudinal wave and seismic transverse wave data acquisition, ground three-dimensional broadband magnetotelluric data acquisition and ground high-density three-dimensional gravity data acquisition are carried out in a high-surface temperature and high-radioactivity area. Logging and DAS-VSP data in a drilled well in a high-temperature geothermal field exploration area are used for searching geophysical parameters which are abnormally sensitive to a high-temperature geothermal field, longitudinal wave velocity fields, transverse wave velocity fields, longitudinal and transverse wave velocity ratios, Poisson ratios, resistivity and density data volumes of underground three-dimensional spaces at the same depth position are compared and calibrated, a geothermal sweet spot area with high temperature, fault fracture development and rich underground water source supply is delineated according to the selected geophysical parameters which are abnormally sensitive to the high-temperature geothermal field, detailed investigation and comprehensive evaluation are carried out on the predicted geothermal sweet spot area, and the high-temperature geothermal field is quickly and efficiently explored and found at low cost.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, and in particular relates to a high-temperature geothermal field comprehensive geophysical exploration system and a geothermal sweet spot evaluation method. Background technique [0002] Geothermal resource is a very valuable comprehensive mineral resource with many functions and wide uses. It is not only a clean energy resource that can be used for power generation and heating, but also a kind of mineral that can be used to extract bromine, iodine, borax, Hot brine resources and natural fertilizer water resources for industrial raw materials such as potassium salts and ammonium salts, as well as valuable medical hot mineral water, drinking mineral water resources and domestic water supply sources. [0003] There are many hypotheses about the source of geothermal heat. It is generally believed that geothermal heat mainly comes from the heat released by the disintegration of radio...

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Problems solved by technology

[0005] According to the distribution characteristics of geothermal resources, although the underground temperature gradually increases with the increase of depth, if the geothermal resources are buried too deep and there are not enough groundwater supply channels, they can be developed and utilized by pumping underground high-temperature hot water or high-temperature water vapor to the ground The cost of geothermal energy resources is too high to achieve cost-effective large-scale development of geothermal energy resources

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