A research on the geothermal structure in Yanqing-Huailai Basin and its neighbouring region

Abstract

Key words: terrestrial heat flow two-dimensional temperature structure Yanqing-Huailai Basin and its neighbouring regions

Geochemical characteristics of soil gas in the Yanhuai basin, northern China

“…In the Yanhuai basin, the concentrations of CH 4 and CO 2 in soil gas are controlled by factor 2 (Table 2), which reflects that CH 4 and CO 2 may have a genetic correlation, i.e., CO 2 can be formed through the oxidation of CH 4 . Zu et al (1997) confirmed that in the Yanhuai basin, the plain areas have a higher heat flow value than the mountain areas. Therefore, it is reasonable to conclude that the concentrations of the gaseous components are influenced in some degree by underground heat flows because both CH 4 and CO 2 concentrations are sensitive to heat flow value.…”

“…Such a character is considered to be related to the thickness inhomogeneity of crust and the fault distribution in the basin. Artificial seismic sounding, magnetotelluric prospecting (Gao and Ma, 1993) and two dimensional temperature structure calculation (Zu et al, 1997) demonstrate that the thickness of lithosphere and Moho depth increase gradually from east to west in the Yanhuai basin, resulting that Rn, Hg, He and CO 2 are absorbed and dissolved in different degree when they penetrate the overlain strata in differential regions. Zhu et al (2006) predicted that the Yanfan basin appears to suffer more severe seismic hazards and a potential earthquake seams to occur earlier comparing to Huaizhuo basin according to the research on tectonics, fault slip velocity in the Yanhuai basin and magnitude-time prediction model calculation.…”

Survey on Geothermal Resources in Zhangjiakou Area

“…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 work has preliminarily defined that the area has good geothermal resource accumulation conditions [2][3] [4]. In order to further ascertain the accumulation conditions and resource potential of deep geothermal resources in the Yanhuai Basin, from 2019 to 2020, the China Geological Survey organized investigation and research for in-depth geothermal resources in the area, and deployed high-precision gravity and magneto telluric (MT) , Controllable source audio magneto telluric (CSAMT) and seismic surveys and other comprehensive geophysical exploration work [5]; At the same time, in order to verify the survey results, a 3000m deep geothermal resource survey parameter well "ZK02" had been deployed and completed.…”