Schematic diagram of reservoir fracture element. (a) Sketch map of REV, fracture spacing is 10m, horizontal well spacing is 30m, fracture length is 5m, fracture zone is 5m*5m*0.5m. (b) Finite element mesh of REV. 

Context in source publication

Context 1

... substituting Eq. 14-15 to Eq. 13, the mass conservation equation turns to a comprehensive equation, which contains convection, diffusion, desorption and porosity compressibility four types of mechanisms. Moreover, it is just depend on the two key factors of porosity and reservoir gas pressure. Shale reservoir design parameters like fracture spacing, perforation numbers are crucial for industrial exploitation. Many researchers have analyzed the sensitivity of these factors (Moridis et al., 2010, Freeman et al., 2013). Based on those researchers’ work, the fracture spacing is 10m in our physical model, horizontal well spacing is 30m. Therefore, the size of representative elementary volume (REV) is 15m*15m*5m. As the fracture width is about 1mm [ Freeman et al. , 2013], there are many secondary fracture appeared during the hydraulic fracturing process, and the real fracture width is much larger than 1mm, in this model 0.5m (half fracture width) is assumed. The fracture zone is 5m*5m*0.5m. As shown in Figure 1. Parameters related to Marcellus shale data and the reservoir physical properties are listed in Table 1 [ Soeder , 1988]. Diffusion coefficient reference [ Schloemer , 2004]. Langmuir volume and pressure is refer to (Bustin et al., 2008), Tortuosity is refer to [ Kuila , ...