| Citation: | LU Ting，WANG Ping，WANG Tao，et al. Research on the Calculation Method of Hydraulic Conductivity of Fractured Media Based on Borehole Imaging and In-Borehole Flow Velocity and Direction Tests[J]. Bulletin of Geological Science and Technology，2025，44（3）：1-10 doi: 10.19509/j.cnki.dzkq.tb20250024
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The acquisition of hydrogeological parameters is of great significance in engineering. Borehole imaging tests and velocity and direction tests are emerging methods for obtaining permeability coefficients in recent years, both of which can calculate the permeability coefficient of a single fracture, with the characteristics of short test cycles and few equipment. However, the permeability coefficient obtained under ideal conditions by borehole imaging tests cannot represent the actual situation, and the velocity and direction tests can only measure single fractures, making it difficult to calculate the overall permeability coefficient of the borehole.
In order to find the relationship between borehole imaging and flow velocity and direction tests in calculating the permeability coefficient of a single fracture, and to propose a new and more convenient method for calculating the permeability coefficient.
Taking the borehole ZW2 in the Lichuan coal mining area as an example, this paper determines the equivalent permeability coefficient through the underground water flow velocity and direction test and the borehole imaging test and compares it with the result of the pumping test.
The results show that the equivalent permeability coefficients obtained from the borehole imaging test and the velocity and direction test are basically consistent with the permeability coefficient calculated by the pumping test, with errors of 40% and 9%, respectively. Comparing the results of the borehole imaging test with those of the velocity and direction test, there is a linear correlation between the two, with the regression equation being
This method is relatively reliable and can directly calculate the permeability coefficients of single fractures, regional fractures, and the entire borehole at different scales. It has the advantages of short test periods, less work, lower cost, and wide applicability.
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