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Genesis of the hot dry rock geothermal resources in the Gonghe basin: constraints from the radiogenic heat production rate of rocks
Zhang Chao1,2; Hu ShengBiao3; Song RongCai1,2; Zuo YinHui1,2; Jiang GuangZheng3; Lei YuDe4; Zhang ShengSheng5; Wang ZhuTing3
2020-07-01
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
Volume63Issue:7Pages:2697-2709
AbstractThe Gonghe Basin, located in the northeastern margin of the Tibetan Plateau, is one of the important hot dry rock (HDR) geothermal resources occurrence area in China. Among the researches of the HDR geothermal resources, the study of the genesis mechanism is one of the most basic and core works and it is also the important basis for the precise potential evaluation and rational development and utilization of the HDR geothermal resources. Based on the radiogenic heat production rate (RHPR) data measured on the 98 core samples gathered from the Gonghe-Guide basin, the characteristics of the RHPR of the main lithology rock in the basin are analyzed, the genesis mechanism of the HDR geothermal resources in the Qabqa geothermal area of the Gonghe basin is discussed, and the corresponding genesis model of HDR geothermal resources is constructed in this study. The results show that the RHPR of the sedimentary rocks (mainly mudstone and silty mudstone) of the Qabqa geothermal area in the Gonghe basin ranges from 1. 21 to 2. 02 mu W . m(3), with an arithmetic average of 1. 67 +/- 0. 29 mu W . m(3), while the RHPR of the basal granites, which are mainly composed of granite and granodiorite, ranges from 1. 17 to 5. 81 mu W . m(3), with an arithmetic average of 3. 20 +/- 1. 07 mu W . m(3). For the Zhacangsi geothermal area in the Guide basin, the RHPR of the sedimentary rocks (sandstone and muddy sandstone) ranges from 1. 83 to 2. 40 mu W . m(3), 2. 13 +/- 0. 23 mu W . m(3) on average, while it varies from 0. 92 to 6. 49 mu W . m(3) (the average of which is 2. 81 +/- 1. 40 mu W . m(3)) for the basal granitic rocks. The tests show that there is no high RHPR anomaly of the basal granites in the Gonghe-Guide basin. However, the thickening of the radioactively enriched layer caused by the continuous collision between the Indian and Eurasian plates since Cenozoic leads to the synchronous increase of the heat contribution of the RHPR of granites, which is about 30. 3 similar to 40. 5 mW . m(2), and therefore it can serve as a stable heat source for the HDR geothermal resources in the Gonghe basin. Based on the RHPR data and the heat flow partition analysis, as well as the existing geological-geophysical research data in this area, this work suggests that the partial melting layer in the crust beneath the study area may be an additional heat source, providing important additional heat flow contribution to the HDR geothermal resources in the study area. On the basis above, the genesis model of the HDR geothermal resources in the Gonghe basin is preliminarily constructed in this study : the joint effect of the radiogenic heat contribution of the granite in the thickened crust and the heat contribution of the partial melting layer within the crust.
KeywordGranite Radiogenic heat production rate Partial melting Hot dry rock Gonghe basin Guide basin
DOI10.6038/cjg2020N0381
WOS KeywordNORTHEASTERN TIBETAN PLATEAU ; RECEIVER FUNCTIONS ; THERMAL STRUCTURE ; QINGHAI PROVINCE ; JOINT ANALYSIS ; GUIDE BASIN ; NE TIBET ; CRUSTAL ; BENEATH ; AREA
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000550583600016
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/97587
Collection岩石圈演化国家重点实验室
Corresponding AuthorZhang Chao
Affiliation1.Chengdu Univ Technol, Coll Energy, Chengdu 610059, Peoples R China
2.Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Environm Geol Prospecting Bur Qinghai Prov, Xining 810007, Peoples R China
5.Survey Inst Hydrogeol Engn Geol & Environm Geol Q, Xining 810008, Peoples R China
Recommended Citation
GB/T 7714
Zhang Chao,Hu ShengBiao,Song RongCai,et al. Genesis of the hot dry rock geothermal resources in the Gonghe basin: constraints from the radiogenic heat production rate of rocks[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2020,63(7):2697-2709.
APA Zhang Chao.,Hu ShengBiao.,Song RongCai.,Zuo YinHui.,Jiang GuangZheng.,...&Wang ZhuTing.(2020).Genesis of the hot dry rock geothermal resources in the Gonghe basin: constraints from the radiogenic heat production rate of rocks.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,63(7),2697-2709.
MLA Zhang Chao,et al."Genesis of the hot dry rock geothermal resources in the Gonghe basin: constraints from the radiogenic heat production rate of rocks".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 63.7(2020):2697-2709.
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