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- W2071301097 abstract "Western Canada, like other petroliferous basins, displays a wide range of petroleum forms from tar to methane gas. Since there is such extreme variation in the value of these forms, it is important to predict not only if hydrocarbons are likely to be present in an area but also, in general terms, the type of product that can be expected. Although petroleum is an exceedingly complex substance and many aspects of its chemistry are still poorly understood, its gross quality from an economic point of view can be explained and even predicted from an understanding of a few natural processes. The API gravity of the original oil depends upon the source materials and environment from which it evolved. In western Canada, it is also possible to recognize three processes which have drastically altered the composition of this original oil after it was pooled. Mild increases in temperature are first beneficial, producing a lighter, more valuable product; however, excessive heating destroys petroleum liquids, leaving only dry gas. Increases in solution-gas/oil ratio (GOR), either through migration of gas into undersaturated pools or through increasing pressure on pools with gas caps, results in natural deasphalting, which improves the quality of oil through precipitation of residuum, but may cause bitumen-plugging problems in reservoirs. Finally, the action of surface waters on crude oil results in the removal of light, water-soluble hydrocarbons, and may initiate biological activity which degrades oil to tar." @default.
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- W2071301097 date "1971-10-01" @default.
- W2071301097 modified "2023-10-14" @default.
- W2071301097 title "Evolution and alteration of petroleum in western Canada" @default.
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- W2071301097 doi "https://doi.org/10.1016/0009-2541(71)90002-7" @default.
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