Reservoir Fracture Prediction Of Three-dimensional Finite Element Numerical Simulation

In this paper, three-dimensional finite element numerical simulation, the group of Qom in Iran kashan area A to F section of the tectonic stress field of finite element modeling and element stress and strain analysis. The finite element linear algebraic equation:In the above seven equations based on the theory, study and use ansys software combined with the existing Iranian kashan area Qom group to study models and mechanical models based on the use of ANSYS software in the three-dimensional 8-node hexahedral element simulation kashan area Qom group AF section of the tectonic stress field, using solid45 solid element simulation of the geological model, mechanical model, the boundary forces of action and constraints, fault handling and mathematical model are predigested, which established a regional Qom group kashan A to F section of tectonic stress field in three-dimensional finite element model and the finite element modal analysis, the different layers of stress and strain on the situation. And has the status of the stress field in good agreement for the quantitative prediction of reservoir fracture provided the reference.In this paper, regional Qom Iran kashan group A to F of fault, anticline, syncline, the main purpose of the calculation model of layers and objects, using fine mesh of three-dimensional element, finite element model of the area that long-established model of 1200m, width of 1200m, in-depth 500m, take into account three main fault systems, the vertical division of the six lithologic (A-F) rapid lateral changes of lithology in the basin, especially in the vertical direction basin (NW-SE) NE-SW staggering. Each unit by unit group of whom own number was divided into 2080 elements, 2172 nodes. In the model the bottom of the constraints imposed by Z direction; model of the South (below) the border, in the local coordinates of the Y direction constraint; model of the East (right) border for the local coordinate system X direction constraint; vertical load its own gravity; near the southeast to or Near North North East to load 80.34Mpa or 85.76Mpa.In addition, this paper three-dimensional finite element simulation of stress and strain resulting stress field, according to criteria of rock fracture, rupture of value through integrated formation evaluation (Fy), rock deformation energy values with a mathematical model of the crack density, using multivariate statistical methods repeatedly discussed and spreadsheets, obtained cracks in different strata of the average density for the distribution of reservoir fractures of the projections provide sufficient preparation for subsequent research has laid a good foundation.