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. The geophysical imaging of sub-basalt targets is still the main objective of the current exploratory efforts at Parana Basin, Brazil. The Serra Geral Formation represents a singular challenge in world’s geology that consists in performing geophysical investigation under a thick basalt layer. Through the forward modeling of standard reference models, supported by the idea to simulate the gravity response of the basin in a virtual environment, it was possible to understand the contribution of each geologic feature to the overall gravity content. By applying the proposed methodology, we investigated which features can be assuredly interpreted with the current gravity dataset available in the area of study, which corrections and filters are better to enhance sub-basalt targets, and finally, if the removal of the gravity response from Serra Geral model improves the imaging of these anomalies. The several simulations indicated that a simple application of the classical gravity corrections and conventional filtering are not efficient to mapping the spatial distribution of igneous intrusive rocks with similar dimensions of Barra Bonita field. Supported by a 2D modeling of the gravity survey, the 3D simulation also indicated the need to improve the Serra Geral density and geometric model before going forward with any geophysical investigation that involves the density as key property. Keywords:  3D simulation, complex synthetic model, sub-basalt targets. RESUMO. O imageamento de prospectos sub-basalto ainda e o principal objetivo dos projetos exploratorios na Bacia do Parana, Brasil. A Formacao Serra Geral representa um desafio singular da geologia global que consiste em executar a investigacao geofisica abaixo de uma espessa camada de basaltos. Atraves de modelagem direta de modelos consagrados da bacia, embasada pela ideia de simular a resposta gravimetrica da bacia em um ambiente virtual, foi possivel entender a contribuicao de cada feicao geologica para composicao da resposta gravimetrica completa da bacia. Com a aplicacao da metodologia proposta, investigamos quais feicoes geologicas podem ser interpretadas utilizando o dado gravimetrico disponivel na area de estudo, quais correcoes e filtros sao melhores para realcar anomalias sub-basalto e, finalmente, se a remocao do efeito gravimetrico do modelo do Serra Geral facilitaria o mapeamento dessas anomalias. As diversas simulacoes indicaram que a simples aplicacao das correcoes gravimetricas classicas e filtragens convencionais nao sao eficientes no mapeamento da ocorrencia de igneas intrusivas de dimensoes analogas ao campo de Barra Bonita. Baseada em uma modelagem 2D do dado gravimetrico real, a simulacao 3D tambem evidenciou a necessidade de melhoria do modelo geometrico e de densidades da Formacao Serra Geral antes de seguir com qualquer outra investigacao geofisica que envolva densidade como propriedade fisica fundamental. Palavras-chave: simulacao 3D, modelo sintetico complexo, prospectos sub-basalto.

GRAVITY IMAGING AT NORTHERN PARANÁ BASIN: AIRBORNE GRAVITY DATA ANALYSIS AND FORWARD MODELING SIMULATIONS