Geothermal occurrence analysis of Dongying Formation in Tanggu area of Tianjin

作     者：LIU Jiulong JIN Baozhen LI Yuanyuan WANG Jige YUE Liyan WANG Xi 

作者机构：Tianjin Geothermal Exploration and Development-Designing Institute 

出 版 物：《Global Geology》 (世界地质（英文版）)

年 卷 期：2014年第17卷第3期

页      面：163-169页

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：Supported by Project of Dongying Geothermal Resources Survey in Tanggu area of Tianjin(Tianjin Land and Housing TaskNo.003) 

主　　题：Dongying Formation sedimentary environment geothermal fluid enrichment condition hydraulicconnection Tanggu area 

摘      要：Based on introducing geological structure of Tanggu area, the authors analyzed the sedimentary environment of Paleogene Dongying Formation, and further analyzed its geothermal occurrence. The studied area spans two grade IV tectonic units which are Beitang depression and Banqiao depression. The studied area is mainly located in the Tanggu nose-like structure which is the secondary structure of Beitang depression. Its existence affects the sedimentary distribution of the part strata of Paleogene. The depositions of Dongying Ⅲ （ SQEd3 ） and Dongying Ⅱ （ SQEd2 ） are mainly delta front facies and lake sand bars which are propitious to the geothermal fluid enrichment. The favorable enrichment region of geothermal fluid is located in south Hetou- Tanggu. Most of Dongying Ⅰ （ SQEd1 ） changes into swamp plain deposition, only the northeast part of this area is the distributary riverway facies with developed sand layers. There is the favorable enrichment region of geothermal fluid. The hydraulic connection is weak among the geothermal reservoirs of Dongying Formation and its overlying Guantao and Minghuazhen formations. The underlying Shahejie Formation geothermal reservoir pro- vides a steady stream of fluid supply and ground pressure protection for Dongying Formation geothermal reservoir.