Geothermal resource electromagnetic temperature inversion method and system based on rock physical

Abstract

The invention discloses a geothermal resource electromagnetic temperature inversion method and a system based on rock physical. The method comprises the following steps of: analyzing influences of thermal storage factors on a thermal storage temperature, obtaining effective thermal storage factors, and dividing a plurality of effective thermal storage factor bands; obtaining a relational expression between the thermal storage factor and the heat storage temperature corresponding to each effective thermal storage factor band based on geological geophysical parameters and geochemical parametersof a target region thermal storage volume and through an intersection analysis of logging temperature measurement, acoustic wave velocity, and resistivity; calculating a parameter in the relational expression corresponding to each effective thermal storage factor band based on logging temperature measurement, acoustic wave velocity, and resistivity; and obtaining a final relational expression corresponding to each effective thermal storage factor band based on the relational expression corresponding to each effective thermal storage factor band and a ground temperature gradient, and carrying out electromagnetic temperature inversion on each effective thermal storage factor band. A relational expression is established through high-temperature and high-pressure rock physical analysis, and the calculation result is more reliable and accurate based on the constraint operation of geological data such as the logging temperature measurement and the ground temperature gradient.

Description

technical field [0001] The present invention relates to the field of geothermal geophysical exploration, and more specifically, to a rock physics-based electromagnetic temperature inversion method and system for geothermal resources. Background technique [0002] In the geophysical exploration of geothermal resources, the traditional method is mainly based on the comprehensive exploration based on the response of groundwater or water storage structure to geophysics. How to directly calculate the temperature of groundwater through surface geophysical methods, so as to facilitate the targeted development of geothermal resources, has always been a difficult point in geothermal exploration. The results of electromagnetic exploration are the comprehensive response of various underground factors, including structure, lithology, temperature, water saturation, salinity, etc. How to realize the direct relationship between temperature and resistivity, suppress or quantify other factor...

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Problems solved by technology

First of all, this calculation itself is a rough calculation that ignores other influencing factors. The author himself also makes certain assumptions about other factors in the article. Secondly, Cheremensky’s empirical formula (1) is only a sample of the lithology of the former Soviet Union. According to the statistical results conducted, in view of the differences in geological conditions in China, whether it is appropriate to directly quote formula (1) remains to be discussed

Also, Meng Yinsheng (2011) directly quoted this formula. However, when Meng Yinsheng applied this formula, he considered that the resistivity and ground temperature are affected by various factors. In order to better simulate the actual underground situation, he calculated When adding simple geological factors (geothermal gradient, rock boundary, etc.) to the temperature, the results obtained by this method are more convincing than direct application, but the weakness of this method is that it still has not established accurate experience for the target area The formula, the previous analysis of the correlation between ground temperature and electromagnetics and the key influence on silver are lacking

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