Petrophysical characterization of carbonate naturally fractured reservoirs for use in dual porosity simulators

This study shows how multiporous system is grouped and the parameters obtained by means of a petrophysical characterization are used in a dual porosity simulator. Carbonate naturally fractured reservoir is a multiporous system that contain microfractures, fractures, vugs, macrovugs, matrix, type of fractures network. Because they must be incorporate into the Numerical Model of Simulation the results of the petrophysical characterization, it is conceptualized like a model of double porosity. Porosity of pseudomatrix. To the matrix porosity the porosity of the microfractures are grouped in one porous media. Secondary porosity. The vugs and the fractures are grouped in other porous media. In carbonated naturally fractured reservoir, the Jurassic tectonic generated faults, the zones near these generate runners of fractured zones which increases the secondary porosity in addition dolomitization process and dissolution. In geothermal or volcanics reservoir the are generated fractures and their runners of fractured zones by different processes, the main fractures are one porous media and microfractures are the secondary media due to their conection with the first porous media. INTRODUCTION The new well location of a drilling well requires to define zones with greater cumulative and producing potential that show the simulators. Petrophysical characterization is a focused method to diminish the risk of perforating wells with low productivity. Developments Concepts In a petrophysical model their variables are the properties of the rock and their coefficients and exponents are their parameters. In order to represent the matrix, the secondary system and the system of double porosity, the parameters differ in their values. In a mixing model, the system variable is a mixing of two porous media, it is dominated by weight functions on each porous media, there are static and dynamic. The new petrophysical model of double porosity is the set of mixing models, so much previously published as the new ones developed in this work. Petrophysical Characterization Models are the set of petrophysical models and mixed models for multiporous systems with the purpose of obtained all the properties that can be modeled their threedimensional variability. The petrophysical characterization involve concepts of geomechanics such as for calculation of system compressibility using logs and the matrix using cores. The process considerations are: matrix petrophysical properties, the dual porosity system and the secondary system are represented correctly with models of petrophysical characterization. The petrophysical characterization models must correspond to the elements and their behavior of carbonated naturally fractured reservoir, reason why they are useful in the obtaining of petrophysics parameters because the exact relations between the characteristics of the rock often do not exist due to the complexity and to the variation of the composition of the rock, of the structure of the pore, and other intrinsic characteristics. The petrophysical variables are the base to obtain dynamic variable, these you complete when introducing themselves to the simulator become parameters that characterize to the reservoir. In a numerical simulation model the variables are x, y, and, z and time and the parameters are the characteristics of the rock and the fluid. Using dynamic models altogether with the results of the matrix, the system of dual porosity and the secondary system dynamic parameters are obtained that are vital to calculate the oil forecasting under different schemes. The production history of the reservoir is used for to match the dynamic parameters. Geophysical logs gives measurements petrophysical properties of the dual porosity system (Now conceptualized), applying the petrophysical characterization to the dual porosity system, allows to obtain their properties such as: the total porosity, cementation exponent of system, channels equivalent