In interpretation and application of logging data, main attention has been previously paid to the study of logging drill hole itself, thus resulting in the reduction of practical value of the logging data. Adopting chiefly temperature logging in combination with apparent resistivity logging, ground electromagnetic and hydrochemical methods, and employing the "three-dimensional projection" assupption of "body" (geological body) and "field" (natural field, artificial field, etc.), this paper makes a preliminary macroscopic attempt to detect the three-dimensional distribution of the heat reservoir structure from point, line, plane and body instead of focusing only on a single drill hole. An analysis of the data obtained from a certain thermal field shows the feasibility of this three-dimensional assumption.