Presalt reservoirs of the Santos Basin accounted for more than 50% of Brazilian hydrocarbon production in the first two months of 2019. Its most important reservoirs are found in the Barra Velha Formation; thus understanding its genesis and geologic history is essential. This formation is composed of carbonates deposited in an alkaline lacustrine environment with a multiplicity of facies from boundstones and grainstones to mudstones. We have performed a sedimentary analysis based on the integration of sidewall core (SWC) samples and well logs from two wells coupled with seismic patterns discrimination to characterize the tectonic and depositional evolution of the Barra Velha Formation in a sector of the Outer High of the Santos Basin in this study. Our method initially consisted of the evaluation of well logs, aiming to identify shallowing and flooding upward cycles of the second and third orders for the paleoenvironmental conceptualization upper rift and sag phases. Then, we defined electrofacies through the integration of SWCs, gamma ray, and acoustic impedance logs using the crossplot approach. Finally, we described seismic patterns throughout the study area and correlated with results from well data analysis. Therefore, the Barra Velha Formation was subdivided into three zones: the lower, intermediate, and upper zones. Well 1 has a facies association characteristic of a proximal and stable environment during deposition, whereas well 2 initially presents in a distal environment sedimentation that evolves to a more proximal setting. This fact evidenced differences with respect to base-level variations indicating compartmentalization within the lacustrine environment of the upper rift and sag phase that corroborated with the detailed seismic pattern interpretation of the study area.

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RESUMO:Este estudo teve por objetivo analisar a produção científica sobre a utilização do sensoriamento remoto na agricultura de precisão, desenvolvida por autores vinculados a instituições brasileiras, com base numa ampla compilação de artigos científicos. Adotou-se como metodologia de pesquisa a análise bibliométrica e, a partir dela, relacionaram-se os resultados obtidos às dimensões espacial, temporal, institucional e temática da pesquisa brasileira nesta área. Os resultados evidenciam que, apesar de recente, o sensoriamento remoto vem contribuindo para o manejo da agricultura a sítio específico, estando à produção científica concentrada, principalmente, nas instituições das regiões Sudeste e Sul do Brasil. A maior freqüência de uso dessa geotecnologia tem ocorrido no nível terrestre, o que permite o aprimoramento e lançamento de novos sistemas sensores comerciais. Verificou-se que as diferenças nas abordagens variam em função das técnicas empregadas. Enquanto que no sensoriamento remoto terrestre o enfoque está na caracterização do comportamento espectral de solos e de plantas, no sensoriamento remoto orbital a contribuição está nas estimativas de variações espaciais e/ou temporais de áreas cultivadas e de produtividades, condições importantes para a previsão de safras agrícolas. Palavras-chave: Sensor. Manejo localizado. Análise documentária USE OF REMOTE SENSING IN PRECISION AGRICULTURE:A BIBLIOMETRIC ANALYSIS SUMMARY: This study aimed to examine the scientific literature on the use of remote sensing in precision agriculture that was developed by authors from institutions in Brazil, based on an extensive compilation of published scientific articles on the topic. It was adopted as a research methodology the bibliometric analysis, and from it, the results were related to the spatial, temporal, institutional and thematic dimensions of Brazilian research in this area. The survey results show that, although recent, remote sensing has been contributing to the management of the sitespecific farming, with the scientific production concentrated mainly in the institutions of the Southeast and South regions of Brazil. The highest frequency of geotechnology use occurs at the ground level of remote sensing, allowing the improvement and introduction of new sensor systems business. Moreover, it was found that the differences in approaches or research questions vary depending on the techniques used. While in the terrestrial remote sensing the approach is to characterize the spectral behavior of soils and plants, in orbital remote sensing, the contribution is focused on the estimation of cultivated areas and productivity, important conditions for the crops yields predicting.