Huaibei Tectonically Deformed Coal Three-dimensional Seepage Flow Fracture System Characterization And Permeability Prediction

In order to study the three-dimensional seepage of different types of tectonic fracture system and coal permeability, this paper takes Huaibei as the study area,samples of Tectonically Deformed Coal(TDC), macroscopic and microscopic observation of samples, selected different types of TDC samples, synchronized with CT scanning, penetration testing, application of MATLAB software platform independent programming to extract quantitative indexes of different TDC 3D seepage fracture system in the study, to explore the characteristics of seepage and TDC fracture system based on permeability control, then establishes the prediction model of coal permeability structure, and deformation of coal—powder of coal, freeze the experimental method to obtain the permeability of rules required samples, studied the effect of freezing method of coal powder porosity and permeability.The main conclusions are as follows: After the freezing test, successfully drilled powder of coal experimental permeability test rules of frozen samples, caused by the broken coal pore damage, improve the permeability of the sample; on the basis of CT scan and MATLAB software platform, based on independent programming, forming a3 D structure of coal extraction seepage system software, to achieve a quantitative the fracture system parameter extraction; reveals the differences between different TDC3 D seepage fracture system, the volume and size of different type structure coal 3D seepage fracture system to achieve the most value in the fractured coal, with the increase of deformation intensity decreased gradually, and the area of fracture system scale showing the same trend, the average width, the fractal dimension and roughness coefficient of variation; obtain the permeability and the change characteristics of different TDC overall, with the The increase of the deformation degree of permeability, showing the overall downward trend; to explore the control effect of 3D seepage structure of coal fracture system on permeability, effects of 3D seepage in fractured system on permeability of tectonic coal is generally in scale based on crack growth, fracture width, roughness, lead to different deformation degree of tectonic coal permeability change of main crack was dominating in size, area, showed that the main component of the sample fracture fissure contribution is large, thereby affecting the sample permeability prediction model of 3D seepage; different type structure coal permeability of fracture system was established based on 3D seepage body size based3 D fitting curve of average crack width, roughness coefficient, width, single main fissure single main crack width difference effect and tectonic coal permeabilitySurface model.