Genetic Mechanism and Development Prospects of Gaoyang Geothermal Field and Its Adjacent Areas
MAO Xiang, WANG Xinwei, GUO Shiyan, BAO Zhidong, GU Xuexi
[SINOPEC Star Petroleum Co., Ltd. (Sinopec Star), China]
As a green and renewable energy, geothermal energy plays an important role in solving the haze problem in Northern China. Gaoyang Geothermal Field, near Xiong’an New Area, is rich in geothermal resources. It is located in Jizhong Depression of Bohai Bay Basin, and carbonate stratum of Jixian system and Changcheng system of Mesoproterozoic and the underlying stratum of Archean developed. Among them, the Wumishan Formation of Jixian System are the main stratum where Gaoyao Geothermal Field karst reservoirs developed. The buried depth of the top of karst reservoirs of 3600m is the boundary of Gaoyao Geothermal Field. The main body of Gaoyang geothermal field is located in Gaoyang low basal bulge, Lixian Slope and covers a small area of Baoding Sag and Raoyang Sag. Gaoyang geothermal field locates in the area with high karst reservoirs top surface temperature, and the temperature of the middle and northern part of Gaoyang low basal bulge, the western boundary and the junction area of Lixian Slope and Raoyang Sag can reach as high as 120℃, meanwhile, the temperature of southern part of geothermal field and the middle and eastern part of Lixian Slope is lower than 100℃.The density of temperature contours are similar in each direction, with the Northeast-Southwest direction are sparser than the Northwest-Southeast Direction. The hydrochemical charcteristic of geothermal water of Wumishan Formation of Jixian System in Boye Area is Cl-Na Type, and its total dissolved solids is about 5000mg/L, among it the content of Cl-(2300mg/L) is obviously higher than Xiongxian, Rongcheng, while the content of SO42-(123-133mg/L) is higher than Jizhong Depression’s Xiongxian, RongCheng, Bazhou, however lower than Tianjin geothermal field, Liangxiang geothermal field. This shows that Jizhong depression belongs to different geothermal system with Tianjin, Liangxiang area. The conceptual model of Gaoyang geothermal field was that the atmospheric precipitation of Taihang mountain played as the supplier of groundwater and the piedmont fault of Taihang mountain connected the atmospheric precipitation with reservoirs. Atmospheric precipitation flowed through piedmont fault, Hengshui Fault, Anguo Fault, Baichi Fault and unconformities and migrated to Gaoyang low basal bulge, Lixian Slope and Shenze low basal bulge and at where formed traps. The water was heated by heat convection through the process of flowing through faults and bedrocks, and formed Gaoyang geothermal field. Gaoyang geothermal field is valuable with a great potential to exploration and exploitation.
|        Topic: Geology||Paper Number: 12052|