A Discussion of Methodology Study on Geothermal Reservoir Evaluating

Abstract

Geothermal reservoir, also called thermal reservoir, is a carrier and rock storage of geothermal resource, of which accurate characterization and evaluating is the basis of geothermal exploration and development. The paper started with fundamental and basic research way of evaluating on geothermal reservoir, stipulated the main contents of the evaluating, and also discussed the voluation range of the evaluating parameters on the basis of sandstone pore-type reservoir of the Neogene Guantao Formation and the carbonate carst-fissure-type reservoir of Cambrian, Ordovician and Mesoproterozoic Jixian in North China area. Ultimately, on account of producing data analysis, an evaluating method has been established for sandstone pore-type reservoir and the carbonate carst-fissure-type reservoir, and the parameters of which like reservoir temperature, water yield, reinjection proportion, petrophysical properties were assigned to obtain geometrical mean as a comprehensive evaluating index, upon which the reservoir was divided into three ranks, for instance, typeⅠ, typeⅡ and typeⅢ, corresponding to advantageous, moderate advantageous and disadvantageous reservoirs respectively, and the reservoirs in the same rank can be classified according to their index bulk, thus accomplish synthetic evaluating of geothermal reservoir.