FIELD: physics.
SUBSTANCE: disclosed is a method of determining properties of a permeable formation, which involves creating three mathematical models of propagation of a low-frequency pressure pulse: in a well, in a formation and in a single well and formation system. The third model is used to determine the frequency range in which the coefficient of reflection of the low-frequency pressure pulse from the formation is sensitive to a formation property. At least one low-frequency pressure pulse is generated in the well and the resultant well response is detected by at least one sensor of a liquid parameter, measured in response to the low-frequency pressure pulse. By analysing response, reflection of the pressure pulse from the formation is detected in the well response; data obtained by simulation are compared with data obtained by detecting well response, and formation parameters in the third model are adjusted so that data obtained by simulation match data obtained by detection. Formation properties are defined as parameters which provide matching.
EFFECT: high accuracy of analysis data obtained during various well operations without stopping said operations.
16 cl, 10 dwg
