Aplicação da lógica fuzzy para correção de dados de perfil de raios gama e correlação com porosidade efetiva de testemunhos da Bacia de Resende, Rio de Janeiro

Abstract

ABSTRACT. This work presents here a study on the porosity of cores from Resende Basin (Rio de Janeiro). The first step involved the selection, thinning of the material (core) and sample preparation for the use of porosimeter to obtain effective porosity. The material studied is sandstone, friable, coarse to very fine of three wells (GPR1, GPR2 and GPR3). The fuzzy logic (MatLab) was applied to the effective porosity data calculated from the gamma ray (GR) profile for the construction of a synthetic profile and from this we could identify the errors made in calculating the data. Then the results of porosity from the core were correlated with data from the corrected effective porosity (gamma ray profile) in order to prove the results obtained with both methods. The analysis of the synthetic porosity calculated by the fuzzy logic has shown that this is a promising method for assessing the quality of data and to obtain good fits.

Development and Validation of an Autonomous System for Measurement of Sunshine Duration

“…In contrast, if the sensor voltage is negative or zero, variable E assumes zero. This procedure allows for the estimation of the SD regardless of the position of the solar disk in the sky and the moment of sunrise occurrence [26,27]. Figure 8 shows the structure of the implemented fuzzy logic algorithm.…”