Occurrence Characteristics and Exploitation of Geothermal Resources in Yanchang Oil and Gas Area of Ordos Basin

Ordos Basin is rich in geothermal energy at moderate and low temperature. By studying the occurrence state of geothermal resources in Yanchang oil and gas area, it is found that there are mainly two sets of thermal reservoirs: Cretaceous clastic rocks in the west and Carboniferous and Jurassic clastic rocks in the east; The thermal conductivity of rock is closely related to the degree of diagenesis and porosity of formation rock; The geothermal gradient is 2.73–3.50 ℃/100 m, which is higher in the north and lower in the south; The earth heat flow value is 57.28–86.18 mW/m², with obvious east–west distribution characteristics. The comprehensive analysis shows that the geothermal resources in the eastern part of the region are better than those in the western part, and can be divided into three types: shallow low temperature favorable area, middle–low temperature favorable area and middle-deep medium temperature favorable area. Combined with the exploitation and utilization examples of geothermal resources in oil fields, it is considered that the transformation and utilization of abandoned Wells in these favorable areas can reduce the cost of geothermal development projects and realize the stepwise utilization of geothermal resources in geothermal power generation, industrial utilization and three–production and aquaculture, it is expected to establish an energy internet framework of "Source network load storage integration".