| 摘要 |
Method for finding in situ the characteristics of oil are provided. The methods generally comprise logging the borehole to determine the total formation content of at least one element such as vanadium, sulfur or nickel associated with oil quality and determining how much of the total content is due to the occurrence of the element in the minerals of the earth formation and how much is due to the occurrence of the element in the oil. From the determination of how much of the element is in the oil, a characteristic of the oil at a depth in said borehole is found. In order to determine how much of the element is in the minerals of the earth formation, an equation relating the element to the minerals is required as well as a knowledge of which minerals are at the particular depth in the formation and in what quantities. The equation relating the minerals and element is obtained via a multiple regression analysis on elemental and mineralogical data.
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