Analysis of geothermal resources potential for hot dry rock in the Subei Basin

doi:10.13745/j.esf.2020.1.6

Abstract

Abstract:

The Subei Basin, a Mesozoic-Cenozoic fault-depression, developed on the pre-Sinian System basement and Paleozoic marine platform deposits. From the Yanshanian Period, the area underwent large scale magmatic and volcanic tectonic activities and deposited ultra thick Cenozoic strata in the continuously active oceanic-continental tectonic belt. This unique structural environment provides relatively high geothermal flow values and large geothermal gradient, therefore huge geothermal resource potential, in the Subei Basin. Based on the comprehensive investigation of regional geothermal geology, combined with synthesized analysis of geological structural characteristics, collected geothermal data and geophysical information, we preliminarily infer that there are not only shallow medium-low temperature geothermal resources, but also high temperature hot dry rock(HDR) resources in the deep part of the region. We believe that the geothermal resources of HDR mainly come from the deep mantle and are the results of lithospheric thinning, mantle uplifting and the extensional cracking of crust since the Cenozoic. According to the scientific criteria of resources selection, the predominant prospecting area in the basin has abundant dynamic heat sources, excellent heat conduction channels, large-scale thermal reservoirs and good thermal insulation cap rocks. Based on these analyses of HDR potential, we established a genetic model to provide reference for further exploration and development in the basin.

Key words: Subei Basin, hot dry rock, potential analysis

CLC Number:

P314

LIU Demin, ZHANG Genyuan, GUAN Junpeng, ZHANG Shuo, ZHANG Jingqi, KONG Linghao, SHAO Junqi. Analysis of geothermal resources potential for hot dry rock in the Subei Basin[J]. Earth Science Frontiers, 2020, 27(1): 48-54.

Figures/Tables 6

Fig.1 Tectonic map of the Subei Basin.Adapted from [12-13].

Fig.2 Heat flow and geothermal gradient map of the East China continent. Adapted from [15].

Fig.3 Distribution map of igneous rocks in the Subei Basin. Adapted from [22].

Fig.4 Distribution of Curie point depths in the Subei Basin. Modified from [32].

Fig.5 Moho topographic map of the Subei Basin. Adapted from[32,34].

Fig.6 Genesis model of geothermal resources in the Subei Basin

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