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Hydrothermal Dynamics In The Mesozoic and Cenozoic Graben Basin
The utilization of geothermal energy is now expanding, with the installed capacity increasing fast every year. For the large-scale utilization of hydrothermal energy, the genesis of heat accumulation and the hydrothermal dynamics are primary factors for locating the target of geothermal reservoirs. Among all the sedimentary basins, the Mesozoic and Cenozoic Graben basin is always favorable for hydrothermal energy exploration because 1 there are extensional structures beneficial for heat transfer and accumulation; 2. Many tectonic events are new enough to contribute for the heat accumulation; 3. Groundwater flow systems provides heat redistribution. In this paper, we take the Gonghe basin and the Bohaibay Basin as examples to summarize the hydrothermal dynamics in the Mesozoic and Cenozoic Graben basin, and geochemical methods including the use of environmental isotopes and artificial methods and geophysical methods including temperature logging and Lithospheric thermal structure analysis will be introduced. The hydrothermal dynamics in different reservoirs including the sandstone, carbonate stone and granite will be shown to see their differences. The findings of this work will be helpful for tectonic and geothermal research as well as identifying new large-scale geothermal fields.