Present geothermal field characteristics and its influencing factors in Xiong'an New Area
- 1Northwest University, Department of Geology, Xi'an, China (gss61333@163.com)
- 2China University of Petroleum, College of geosciences, Beijing, China
Xiong'an New Area is located in the northern of Jizhong Depression in Bohai Bay Basin, covered by three geothermal fields: Niutuozhen, Rongcheng, and Gaoyang. Clarifying the rock physical conditions and geothermal characteristics, combined with the elements of geothermal resource accumulation (heat source, channel, reservoir, caprock, fluid), plays an important role in understanding geothermal resources.Based on heat source research, this study analyzed the temperature measurement curves of 30 drilling wells and measured data of thermal conductivity and heat generation rate of 100 rocks to analyze the geothermal gradient and distribution of geothermal flow in Xiong'an New Area. The results showed that Xiong'an New Area has a high geothermal background, with geothermal flow ranging from 53.3mW · m-2 to 106.5mW · m-2, with an average value of 73mW · m-2. It is higher than the average heat flow value of 63.0 ± 24.2mW · m-2 in China Mainland, and belongs to high abnormal area. The geothermal gradient of caprocks is around 35 ℃/km, slightly higher than that of the Mesozoic and Cenozoic fault basins in Eastern China. Based on the geothermal field, combined with the characteristics of heat sources, reservoirs, and channels of deep geothermal resources, a genetic model of geothermal resources in Xiong'an New Area is established. It is considered that the reservoir-cap assemblages composed of the Cenozoic caprocks and the Proterozoic carbonate rocks in Xiong'an New Area, the alternating structural pattern of uplift and sag, and fluid activity affect the occurrence of deep geothermal resources. The geothermal resources are prone to enrichment in uplifted structures controlled by faults or in low uplifted Proterozoic thermal reservoirs. The high-value of geothermal flow, high permeability reservoirs, and regional continuous caprocks are favorable areas for geothermal development.
How to cite: Guo, S., Cui, Y., and Tang, B.: Present geothermal field characteristics and its influencing factors in Xiong'an New Area , EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-9278, https://doi.org/10.5194/egusphere-egu24-9278, 2024.