Avaliação do potencial de um arenito português para ser rocha reservatório através da sua caracterização físico-mecânica

Sergio Yanny Soares Ten Jua

Key information

Authors:

Sergio Yanny Soares Ten Jua (Sergio Yanny Soares Ten Jua)

Supervisors:

Maria Amélia Alves Rangel Dionísio (Maria Amélia Alves Rangel Dionísio); Gustavo André Paneiro (Gustavo Paneiro)

Published in

11/22/2021

Abstract

Oil is an essential fossil fuel in today's society. This product is a combination of hydrocarbons that can come in the form of liquid oil or gas. Oil can be found in underground reservoirs. Reservoirs are sedimentary rocks that allow the storage and flow of hydrocarbons. From a commercial point of view, it is important to know the characteristics of a reservoir rock, particularly the physical properties of the rock as well as the mechanical properties. In the present work are presented the main characteristics of the rock are necessary to assess its potential as a reservoir rock. Laboratory tests were carried out on sandstone samples from Praia de Porto Novo (Santa Cruz, Torres Vedras) belonging to the Lourinhã Formation. The values of effective porosity and absolute permeability were determined in the laboratory. Additionally, the plugs were subjected to tests of tensile strength, uniaxial and triaxial compression which allowed the determination of mechanical properties. To complement the characterization of the rock, it was used: the hydrochloric acid test, X-ray diffraction, and a colorimeter. The determination of the effective porosity and the absolute permeability reveals mean values of 12.2% and 0.15 mD, respectively. Through the mechanical characterization tests, the following values were obtained: Young's modulus of 4.96 GPa; Poisson's coefficient of 0.24; cohesion of 1.02 MPa; and friction angle of 46.59º. Based on the results obtained, it was possible to relate properties, and it was concluded that the studied sandstone has the potential to be considered a tight reservoir rock.