Survey on Geothermal Resources in Zhangjiakou Area

¹ Beijing Institute of Exploration Engineering, Research Department, 100083 Beijing, China
² China University of Geosciences (Beijing), School of Engineering and Technology, 100083 Beijing, China
³ Ministry of Natural Resources, Key Laboratory on Deep Geo-Drilling Technology, 100083 Beijing, China
⁴ Ministry of Natural Resources, Technology Innovation Centre for Geothermal & Hot Dry Rock Exploration and Development, 050060 Shijiazhuang Hebei, China

^* Corresponding author: tgszdl@126.com

Abstract

The Zhangjiakou area is rich in geothermal resources, and many counties in the region have discovered low-temperature geothermal. Structurally, Huailai County, Zhangjiakou City is located at the intersection of Zhangjiakou-Penglai Fault Zone and Shanxi Fault Basin (or Fenwei Seismic Tectonic Zone), namely the Yanqing-Huailai Basin (Yanhuai Basin). A large amount of geothermal resource investigation and research works has preliminarily defined that the area has good geothermal resource accumulation conditions. From 2019 to 2020, the China Geological Survey has organized several investigation and research in the area for in-depth geothermal resource. As one method of the survey results verification, a parameter well for geothermal resource survey was deployed as ZK02 and completed at 3000m depth. The ZK02 well was completed at a depth of 3006.9m, drilling through the Quaternary, Neogene, and Jixian strata, and entered the Archean gneiss strata. The well successfully explored high-quality artesian heat storage in the Jixian strata, obtained deep geothermal geological data and physical data, revealed the regional stratigraphic sequence and geological structure characteristics, and provided a scientific basis for regional geothermal resource potential evaluation. Based on the engineering practice of ZK02 well, this paper systematically summarizes drilling technology and experience from well structure to drilling equipment, construction technology and key technology, analyses the complex conditions and countermeasures downhole, and provide reference for the follow-up regional geothermal resources investigation, research and development and.