A calculation method for three-dimensional permeability tensor in a carbonate aquifer

The relationship of permeability and their own fissure development of karst aquifers can be linked by the theory of permeation tensor. The macroscopic karst morphology is developed by microfracture systems, which are the products of a unified regional tectonic stress field acting on similar rocks. And the macroscopic karst morphology and the micro-fracture permeability tensor share similarity and correspondence. In this study, the distribution law in all directions is calculated by investigating the spatial distribution data of macroscopic karst morphology in the study area. Furthermore, the principal values of the permeation tensors calculated from a large number of fracture points are analyzed by statistical regression, and the linear relationship between the main values of the permeability tensor and the calculation equation of the three-dimensional deep tensor are derived. The summary calculation formula is used to transform the single fracture of the core in the borehole into a three-dimensional permeability tensor. The flow field formed by the unsteady flow pumping test of the hole is compared and fitted After establishing the groundwater flow model. The results show that the method is feasible to obtain a large amount of data compared with the existing permeation tensor estimation and adjustment, it could save the cost of the traditional threestage water pressure test and other methods and has certain engineering reference for the karst aquifer tensor.