Abstract
Studies on the mechanism of primary migration involve some estimate of how much oil is carried out of the source rocks with the expelled water. A few ppM hydrocarbon in water can be explained by a solution mechanism but an oil-phase migration mechanism would require a much higher concentration of oil in water. The calculation of the oil/water ratio of fluids expelled during compaction of the Western Canadian basin was made for latitudes 49 to 60/sup 0/N. A table shows the porosity loss for each rock type and the total volume of water expelled from the fine-grained sediments. This porosity decrease calculates as a water loss of about 480,000 cu km, equivalent to about 480 x 10/sup 12/ MT for this part of the Western basin. Calculations are also made for ultimate recoverable oil potential and the mass of oil that is released by a given mass of source rocks. Results indicate that the quantity of hydrocarbons released from the source beds stand at about 6 to 16 percent of that still in place. (MCW)
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