Sharif Digital Repository

Hydrocarbon recovery projects involve large capital investments and have a very high risk associated with them. To minimize this risk, accurate predictions of reservoir performance must be acquired. Reservoir simulation is a powerful tool for fulfilling this requirement. Physics, mathematics, reservoir engineering and computer programming are combined in reservoir simulation in order to predict reservoir performance under different situations both accurately and efficiently. Performance prediction in fractured reservoirs is a much harder task. This difficulty is due to the higher uncertainties associated with their physical and geometrical parameters. More than 60% of world, and almost 70%... 

Fracture reservoirs are highly heterogeneous. This heterogeneity makes the process of adjusting model parameters to match both the static geological and dynamic production data challenging. For this reason, the characterization of the fracture network of these reservoirs, which is achieved by finding the appropriate probability distributions of the fracture properties in the discrete fracture network model, requires the use of an integrated workflow for the process of history-matching.This thesis, presents an integrated workflow for the process of history-matching of naturally fractured reservoirs with field-scale performance capability. In this methodology, first, multiple discrete fracture... 

It has been demonstrated that the key features of fracture networks can be identified with the help of high-resolution aerial images of outcrops (rock formations exposed at the Earth's surface) obtained by drones and photogrammetry. The aim of this study is to utilize these images to improve the geometrical modeling of Naturally Fractured Reservoirs (NFRs). Initially, an algorithm is developed for processing aerial images of outcrops, so that the pattern of fracture network can be obtained. After obtaining the fracture network, the Embedded Discrete Fracture Model (EDFM) implemented in the MATLAB Reservoir Simulation Toolbox (MRST) is employed to study two-phase (oil-water) flows in the... 

This thesis aims to present a computationally efficient extended finite element model for the simulation of isothermal single-phase coupled advective-dispersive transport and variable-density/viscosity flow in a saturated, rigid, heterogeneous and fractured porous media with a particular application to miscible viscous fingering instabilities and dispersive mixing in subsurface formations. Density-driven flows arise from differences in salinity or temperature within a fluid body. The partial differential equations governing system is given by the mass conservation equation of the fluid phase, as well as by the advection-diffusion transport equation of the solute concentration. The...