Application of geothermal temperature scale method in temperature estimation of underground heat storage in Rizhao coastal area

Abstract

Rizhao coastal area is located in the southeast of Shandong Province. The development and utilization of geothermal resources are relatively low, and there are few geothermal wells. The research on the deep thermal storage temperature is not high in general. Therefore, this paper attempts to use the geothermal temperature scale method to evaluate the deep thermal storage temperature in this area. Geothermal temperature scale is an economic and effective means to evaluate the temperature of deep thermal reservoir. At present, the commonly used geothermal temperature scales can be divided into four categories: silica geothermal scale, cationic geothermal thermometer, isotopic geothermal thermometer and gas geothermal thermometer. Silica geothermal thermometer and cationic geothermal thermometer are the most studied ones in China and abroad. The empirical formulas of various temperature scales are established by using the relationship between equilibrium reaction of corresponding components in aqueous solution and temperature. Therefore, it is necessary to carefully study the equilibrium state of hot water and minerals and select a reliable geothermal temperature scale. In this paper, the mineral fluid equilibrium of geothermal water in Rizhao coastal camel rock (LTS) and platform (PT) is determined by using Na-K-Mg trigonometry method and multi mineral equilibrium graphic method established by watch program. It is considered that the geothermal water is unbalanced water, which proves that chalcedony temperature scale is more suitable for estimating the heat storage temperature of geothermal system in this area.