Abstract
In this work, the effect of hydrological spatial variability on the heat production performance of a naturally fractured geothermal reservoir was investigated. Using the geological information of an abandoned natural gas exploration well in northern Songliao Basin, northeast China, the hydraulic properties of the fractured reservoir were studied based on DFN models. The heterogeneous distribution of reservoir hydrological properties was simulated using random field method. Evolution characteristics of production temperature, heat extraction rate, injection pressure, reservoir flow impedance, and the spatio-temporal distribution of temperature and pressure were studied. A sensitivity analysis was performed on correlation distance and coefficient of variation for the random field model. The results indicate that spatial variability of the hydrological parameters has significant influence on the heat production performance. Besides, correlation distance and coefficient of variation are two key parameters that influence the distributions of reservoir parameters and cause the variation of heat production performance in random field models.
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