Analysis on Chemical Characteristics and Prospect of Development and Utilization of Geothermal Fluids in Tuanbo New Town, Tianjin

Abstract

Tuanbo New Town is located in Jinghai, the North-west of Tianjin. As one of the eleven new towns in Tianjin general planning, it is also approved as Leisure Tourism Town with Chinese Characteristics and one of the eight natural landscapes of Tianjin. It is also included into the gtwelfth-five yearh strategic planning of Tianjin. Tuanbo New Town is in the Wanglanzhuang Geothermal Field with abundant geothermal resources and belongs to the type of sedimentary basin with mid-low temperature. Because of the fluid temperature and the flow is of high quality, Tuanbo New Town was awarded a title of The Chinese City of Thermal Water. Based on the geological exploration in this area, we found there were many features here. And there are two types of reservoirs: Neogene Porous-type System (Minghuazhen reservoir) and Bedrock Karst Fracture-type System (Ordovician and Wumishan of Jixian), in which Minghuazhen reservoir with a depth of 800 to 900m, a flow temperature of 30 to 60Ž; Wumishan reservoir with a depth of 900 to 2500m, a flow temperature of 74 to 83Ž. Based on collecting the chemical data of the fluids from each reservoir, we draw piper triangular diagrams to analysis the chemical characteristics. We also inferred the formation types of different reservoirs, to provide evidences for the further exploit. The results shows that the geothermal fluids here are medium corrosion and can not form calcium carbonate scale, calcium sulfate scale and calcium sulfate scale. The fluids are not suitable for drinking, fishing and agriculture irrigation. But the good news is that the fluids of each reservoir are rich of dehydrated boric acid, fluorine and iodine. After dealing with them, they have high medical value. So if we develop space heating, bathing , tourism and rehabilitation therapy in Tuanbo New Town, it can create good social benefit and economic benefit. Furthermore, it also accord with the target that we build Tuanbo New Town as Spring Town and Ecological Town.