Interpretação geológica de testes de formação em reservatórios de canais turbidíticos
DOI:
https://doi.org/10.70369/3dw0pd19Palavras-chave:
reservatório turbidítico, teste de formação, modelagem geológica 3D, complexo de canaisResumo
O conhecimento sobre depósitos de canais turbidíticos evoluiu significativamente com o avanço dos dados sísmicos 3D e de estudos de afloramentos análogos. Apesar desses progressos tecnológicos e conceituais, a previsibilidade de produção desse tipo de reservatório ainda representa um desafio. Os diferentes padrões de empilhamento e a variabilidade do preenchimento sedimentar desses depósitos resultam em heterogeneidades internas complexas, frequentemente difíceis de caracterizar diante das limitações dos dados disponíveis. Este trabalho teve como objetivo avaliar o grau de comunicação hidráulica em diversos cenários de empilhamento e preenchimento sedimentar de complexos de canais turbidíticos, integrando parâmetros geológicos e de engenharia de reservatórios por meio da simulação de testes de formação com vazão constante durante duzentas horas. A análise das curvas de derivada de pressão log-log (derivada de Bourdet) permitiu diagnosticar regimes de fluxo radial e efeitos de rampa, discriminando particularidades do comportamento de pressão entre os cenários e quantificando incertezas. As curvas diagnósticas evidenciaram claramente a transição de complexos de canais dominados por migração lateral para aqueles com maior empilhamento vertical. Os diferentes cenários de barreiras de transmissibilidade apresentaram variações discretas na derivada de Bourdet, indicando que tais contrastes de fácies só exercem impacto significativo quando efetivamente compartimentam os canais. O aumento da permeabilidade ampliou o raio de investigação dos testes, facilitando a identificação precoce de barreiras. Os resultados apontam o padrão de empilhamento e a variação de permeabilidade como os principais controles sobre o comportamento hidráulico dos complexos de canais. Por fim, a introdução do conceito de grau de confinamento integrou a análise dinâmica à modelagem geológica, sugerindo que essa métrica, associada aos dados de poço e às informações sísmicas, pode contribuir para a definição de modelos conceituais nos setores próximos aos poços avaliados.
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