John Emery Adams, 1934. "Origin, Migration, and Accumulation of Petroleum in Limestone Reservoirs in the Western United States and Canada", Problems of Petroleum Geology, W. E. Wrather, F. H. Lahee
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The limestone-producing horizons in a number of typical pools in the western United States and Canada are described. The following theories are advanced : first, that the primary porosity of the limestone, which in itself may have been sufficient for the reservoir needs, has usually been increased by solution, recrystallization, and fracturing, of which solution is probably the most important; second, that the limestone oils are of local origin, the pool area forming the source ground on which the petroleum-producing organisms lived; third, that the low gravity of many of the limestone oils is due to the selective action of the limestone on the oil after it has accumulated in the reservoir.