Exploratory data analysis using API gravity and V and Ni contents to determine the origins of crude oil samples from petroleum fields in the Espírito Santo Basin (Brazil)》.pdfVIP

Microchemical Journal 124 (2016) 26–30 Contents lists available at ScienceDirect Microchemical Journal journal homepage: /locate/microc Exploratory data analysis using API gravity and V and Ni contents to determine the origins of crude oil samples from petroleum fields in the Espírito Santo Basin (Brazil) Luiza V. Vieira, Karla P. Rainha, Eustáquio Vinicius R. de Castro, Paulo R. Filgueiras, Maria Tereza W.D. Carneiro ⁎, Geisamanda P. Brandão Chemistry Department, Federal University of Espírito Santo, Av. Fernando Ferrari, 514, Goiabeiras, Vitória, E Espírito Santo CEP 29075–710, Brazil a r t i c l e i n f o a b s t r a c t Article history: In this paper, the Ni and V contents in 64 crude oil samples (API gravity between 10 and 40) from four oil fields in Received 27 April 2015 the Espírito Santo sedimentary basin, located on the southeastern Brazilian coast, were quantified using atomic Received in revised form 13 June 2015 absorption spectrometry. The results were used in an exploratory analysis in which principal component analysis Accepted 15 July 2015 (PCA) and linear discriminant analysis (LDA) were applied to differentiate the crude oil samples. A PCA model Available online 22 July 2015 with two components (PCs) explained 96.8% of the total variance. The weights from the PCA indicated that the V/Ni ratio allows for proper separation of crude oils with marine origins from those with lacustrine origins. In