Genesis Analysis of Geothermal Systems in Guanzhong Basin of China with Implications on Sustainable Geothermal Resources Development

Abstract

Based on results of comprehensive oil and gas exploration, together with data of the exploited Xian an Xianyang geothermal fields, we propose a new model of genesis for the geothermal systems in Guanzhong Basin in Northwest China. The model emphasizes the role of up-lifting and faulting activities that can be related to the movement of the Tibetan plateau towards northeastern direction. The model is different from most geothermal systems commonly found in other sedimentary basins in China that are controlled by heat flow redistribution as a consequence of basement fluctuation. Using geochemical modeling and isotopic analysis, we study the water-rock interaction processes in the main geothermal reservoirs and discuss the anticipated challenges in used water re-injection. Chemical stimulation is suggested, aiming at improving the injectivity of the geothermal reservoir.