## 1 Introduction
In order to verify the slug test's high accuracy and stability for determining the permeability coefficient, a comparison with the calculation results of pumping test was made. [PERSON] [22] carried out the slug test in the biotite gneiss area, and proposed to determine the permeability parameters of fractured rock aquifer through the comprehensive analysis of slug test data and borehole TV data. [PERSON] and [PERSON] [23] proposed a novel apparatus for obtaining the fracture occurrence in borehole. [PERSON] and [PERSON] [24] analyzed the effect of the radial constant-water-head boundaries of slug tests on the evaluation of the hydraulic properties of fractured rocks based on a laboratory analogue experiment platform with an artificial fracture. There are many slug test models and theories around, but the existing theory of the slug test method and test system have trouble dealing with the effect of fractures associated with the geometric features of fractures (occurrence, width, etc.) on water level oscillation. These existing theoretical models of slug tests are generally constructed by taking the horizontal layered aquifer as the physical model. Moreover, most of them deal with porous medium instead of fractured medium. There is little research on the fractured medium, especially on the theoretical research of well flow slug tests in the case of fractures with different dip angles. The permeability parameters obtained from the borehole slug test are often the average parameters of the medium. There are few researches on the slug test method with regard to testing the fracture permeability coefficient in sections and the determination of permeability coefficient tensors of rock mass by the slug test. The current slug test equipment can only record the change process of water level and temperature with time in the borehole, instead of revealing the development of fractures in the borehole. Therefore, it is very difficult to use the current slug test equipment with the slug test to investigate the permeability characteristics of fractured medium anisotropy. New theories and methods for determining the permeability coefficient of different dip angle fractures are derived based on the well flow vibration equation in fractured medium. A test method for the borehole slug test in fractured rock mass based on the self-developed slug test system for determining permeability coefficient tensors of fractured rock mass is proposed. By relying on the underground water sealed cavern project of National Huangdao Petroleum Reserve, the geological information, such as fracture occurrence in the borehole, is obtained by using the self-developed test system [23]. The fracture permeability coefficient, equivalent permeability coefficient and rock mass permeability coefficient tensor of the Huangdao test site are calculated and determined. The field application of determining the permeability coefficient tensor of fractured rock mass according to the borehole geological information and slug test data obtained by the test system is realized. Meantime, the field test comparison between the segmented slug test and conventional water pressure test is carried out to further verify the accuracy and applicability of the new theory and method for determining the permeability parameters of the fractured rock mass.