Relevance of the research. The idea that geology is not the applied science but the fundamental one with its proper laws of the Earth development was stated by F. Engels. This concept was furthered by such Russian scientists as B.M. Kedrov, S.L. Shvartsev, E.V. Penneker. In the second half of XX century V.P. Savchenko and M.K. Habbert developed the hydrodynamic technique for mapping oil and gas traps and accumulation. The technique was based on hydrodynamic equation of D. Bernoulli. In 1991 the author used the first and the second laws of thermodynamics to specify the boundaries of Pervomayskoye oilfield and derived the formula to calculate the specific heat capacity of environment by water parameters. Its value was four times lower than that for ordinary water. The calculated boundaries of Pervomayskoye oilfield coincided with real boundaries. In 2000 this value was called specific heat capacity of formation water. The decrease in this value was explained by the applied science by the increased molar mass of physically bound formation water. But this point of view did not explain the mathematical paradox of obtaining positive result when complicating the formula for calculating specific heat capacity. The main aim of the study is to explain the paradox of obtaining the formula for calculating specific heat capacity from the point of view of fundamental idea of geological mode of water motion. The method used in the study. To prove the possibility of applying this fundamental idea the author used the approach of E.V. Penneker. The latter was the first who proposed to consider hydrogeology not simply as the science of formation waters but as the applied science of subsurface hydrosphere. The results. Using a systematic approach, the author explains the geological cause of the decline of this value and specifies its name - specific heat capacity of filter medium. The paper contains calculations to prove this approach as well. From the viewpoint of the physical nature of creep properties of solid bodies previously substantiated by the author and the modern definition of specific heat capacity, the author shows that this value is a parameter of the creeping filtration of water. Conclusion. The formula for calculating specific heat capacity of filter medium deduced in 1991 can be considered as the fundamental regularity of higher level of matter organization - the geological mode of water movement which is the temperature coefficient characterizing creeping water filtration.