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• W2903200045 abstract "The manufacture of synthetic rock samples has a great importance in the study of the elastic properties of the rocks based on the variation of heterogeneities. For this work we constructed synthetic sandstones with different number of heterogeneities in the samples. We analyzed all samples from ultrasonic point of view (in dry and saturated condition). In total, twelve heterogeneous samples and an isotropic sample for reference were constructed. The heterogeneous samples were divided in three groups (A, B and C): group A with heterogeneities of 3.75-4.25 mm in diameter, group B with heterogeneities of 5-6 mm in diameter and group C with heterogeneities of 6.5-7.5 mm in diameter. From the first arrival picking on P- and S-waveforms, we calculated VP and VS velocities. We also compared the experimental velocities with ones predicted by the theoretical models of modified Maxwell-Garnett and the Kuster-Toksöz models. The theoretical predictions were made for the P and S velocities for the dry and saturated cases. In general, we noted that the best fit between the theoretical and experimental values occurred for the prediction of the modified Maxwell-Garnett model. Keywords: ultrasonic waves, effective model theories, synthetic samples, heterogeneous media. RESUMO. A fabricação de amostras de rochas sintéticas tem uma grande importância no estudo das propriedades elásticas das rochas com base na variação de heterogeneidades. Para este trabalho construímos arenitos sintéticos com diferentes números de heterogeneidades nas amostras. Analisamos todas as amostras do ponto de vista ultrassônico (em condição seca e saturada). No total, foram construídas doze amostras heterogêneas e uma amostra isotrópica para referência. As amostras heterogêneas foram divididas em três grupos (A, B e C): grupo A com heterogeneidades de 3,75 a 4,25 mm de diâmetro, grupo B com heterogeneidades de 5 a 6 mm de diâmetro e grupo C com heterogeneidades de 6,5 a 7,5 mm de diâmetro. A partir das escolhas de primeira chegada, tomando as formas de onda P e S, calculamos as velocidades VP e VS. Também comparamos as velocidades experimentais com as previstas pelos modelos teóricos dos modelos de Maxwell-Garnett e Kuster-Toksöz modificados. As previsões teóricas foram feitas para as velocidades P e S para os casos seco e saturado. Em geral, notamos que o melhor ajuste entre os valores teóricos e experimentais ocorreu para a predição do modelo de Maxwell-Garnett modificado. Palavras-chave: ondas ultrassônicas, teorias de modelos efetivos, amostras sintéticas, meios heterogêneos." @default.
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• W2903200045 date "2018-09-06" @default.
• W2903200045 modified "2023-10-06" @default.
• W2903200045 title "THEORETICAL AND EXPERIMENTAL ANALYSIS OF ULTRASONIC WAVES PROPAGATION ON SYNTHETIC SANDSTONES WITH SPHERICAL HETEROGENEITIES" @default.
• W2903200045 doi "https://doi.org/10.22564/rbgf.v36i3.1949" @default.
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