Evaluation and Application of the Transient-Pulse Technique for Determining the Hydraulic Properties of Low-Permeability Rocks--Part 1: Theoretical Evaluation

摘要

The transient-pulse technique is a well-established laboratory mehod for determining the eprmeability of hydruaulically tight rocks. Although graphical solutions to this test make it possible to evaluate both the permeability and the specific storage of a rock specimen, the attendant procedures are relatively complicated. Often, the expression introducted by Brace et al. (1968) is typically used to interpret the experimental results and arrive at a value for permeability only. In Par 1 of this study, the general solution for the transient-pulse test is extended to consider quantitatively the transient distributions of hydraulic head and hydraulic gradient within the specimen and to examine the validity of using the solution presented by Brace et al. (1968) under these conditions.