Statistical Analysis of the Relations between API, Specific Gravity and Sulfur Content in the Universal Crude Oil

This study was conducted on the universal crude oil samples for the purpose of understanding the relationships between some of the characteristics that control the oil quality. Data were collected from previous works, including specific gravity and weight percent of 13 crude oil samples as well as the API and S % of 138 crude oil samples belong to oil reservoirs located in the different parts of the world. The API against both of specific gravity and weight percent (kg/m3) is governed by an inverse perfect linear regression (r= -0.98) with a better prediction (96 %) for the outcomes data. The API relies not only sulfur content, but there are other parameters control the oil density, where the API is exponentially correlated with S %.