Heat accumulation mechanism of deep ancient buried hill in the northeast of Gaoyang geothermal field, Xiong'an New Area

Abstract

There are two high-temperature and high-yield geothermal wells, located in the deep ancient buried hill northeast of the Gaoyang geothermal field at the Xiong'an New Area, are constructed by China Geological Survey during the past two years. The successful implementation of the two deep wells reveal that there is a second space for geothermal development in deep Xiong'an New Area. The deep carbonate rock has a high thermal storage temperature, large flow rate, and huge development potential. On the basis of previous studies, this article fully summarizes the latest survey results of geothermal resources in deep buried hills in the northeast of Gaoyang Geothermal Field and these comprehensive analysis show that the heat accumulation mechanism of the study area are as follows: ① Affected by the westward subduction of the Pacific Plate, the eastern North China Craton is significantly damaged, and the thickness of the lithosphere and crust has been greatly reduced, which is conducive to conduct the mantle-derived heat to the shallow depth; ②The regional Marcy fault and other deep strike-slip faults cut through the lithosphere, which contributed to the deep mantle-derived thermal material and deep magma intruding into the crust; ③The heat flow is gathered from the low thermal conductivity depression to the high thermal conductivity. Besides, groundwater is heated by deep cycle and convection along the fault, and the confluence area of regional karst groundwater also has a certain heat accumulation effect. Because of the combined effect of various favorable factors, a high-temperature and high-productivity carbonate type reservoir is formed in the northeast of the Gaoyang geothermal field.

Keywords

• xiong'an new area
• ancient buried hill
• high temperature
• high productivity
• heat accumulation mechanism
• the second space