The occurrence regularity of deep geothermal resources in the northern of Binhai geothermal field,Tianjin
This paper is the result of the occurrence regularity of deep geothermal resources.[Objective]Tianjin has abundant geothermal resources.Currently,most of the developed deep geothermal resources are located in the"protrusion in uplift area"of structural area,while the exploration and research level of geothermal resources located in the"protrusion in depression area"of structural area is basically blank.Revealing the occurrence regularity of deep geothermal resources can provide important references for the exploration and development of deep geothermal resources in the Binhai New Area of Tianjin and Beijing-Tianjin-Hebei Urban Agglomeration.[Methods]Taking the Qiaogu area in the Ninghe Uplift of the Huanghua Depression as the research area,and the newly discovered Jixian Wumishan Formation as the research object.By analyzing regional geological data,magnetotelluric sounding(MT),borehole temperature measurement,and geophysical logging data,the geological structure,geothermal field,and the occurrence characteristics of deep geothermal resource in the study area are systematically summarized.[Results]The thermal temperature of the Wumishan Formation rangs from 90℃ to 120℃,Water output exceeding 100 m3/h,and the burial depth is relatively shallow,ranging from 2 200 to 2 800 m.The geological conditions in the area are complex,with well-developed fault structures.The Hangu Fault is an important channel of thermal and water conducting in the study area;The geothermal field exhibits a distribution feature of"low anomaly sandwiched between two high anomalies",which corresponds to the spatial location of two anticline structures;The heat source is mainly shell source heat,followed by mantle source heat,and atmospheric precipitation is the main source of hot water.The heat transfer mechanism is mainly heat conduction.[Conclusions]Based on comprehensive study on the occurrence patterns of deep geothermal resources in the research area,a conceptual model of deep geothermal resources has been established,and a new approach for exploring deep geothermal resources in the"depression convex"region is clarified.
geothermal fielddepression convexWumishan Formationoccurrence regularityBinhai new area in Tianjin
万方数据
维普
