Numerical simulation of geothermal field in a three-dimensional multi-fractured geological model of Zhuolu Basin

The prediction of the geothermal field is an important prerequisite for the evaluation of geothermal resources. Much attention has been paid to the research on coupled temperature field of percolation-heat transfer in deep fractured rock mass. The Zhuolu Basin is a graben-type faulted basin of the Cenozoic era. There are many hot springs on the surface and rich geothermal resources. In this paper, a three-dimensional non-parallel multi-fractured geological model of the Zhuolu Basin for large scale was established based on the actual geological survey results and the geological structure section interpreted by 3 geophysical survey lines. Parameters have been assigned or adjusted, a mathematical model of permeate-heat transfer in multi-fractured rock mass considering groundwater flow was obtained. After the model was verified, the internal temperature field of the basin was calculated and indicated. The geothermal anomaly area is concentrated in the center of the Jixian group (around 70℃) and the north- eastern part of the Changcheng group (90~98℃), the internal temperature field of basin have been analyzed at different hydraulic reaolients. The study results provide a certain basis for the exploration, evaluation, development and utilization of geothermal resources in Zhuolu Basin or similar areas.