Changes

==Procedure==

==Procedure==

[[file:migration-of-petroleum_fig7-14.png|300px|thumb|{{figure number|2}}Procedure for estimating expulsion efficiency. Copyright: McDowell (1975); courtesy Oil & Gas Journal.]]

[[file:migration-of-petroleum_fig7-14.png|300px|thumb|{{figure number|2}}Procedure for estimating expulsion efficiency. Copyright: McDowell;<ref name=McDowell1975>McDowell, A. N., 1975, What are the problems in estimating the oil potential of a basin? Oil & Gas Journal, June 9, p. 85–90.</ref> courtesy Oil & Gas Journal.]]

In migration volumetrics, it is important to estimate the original petroleum potential of the source rock—not just its present measured potential (with increasing [[maturation]], a portion of the original potential will have been realized and is therefore unmeasurable). Estimates of expelled hydrocarbons may be derived by measuring the amount remaining in a source and subtracting that value from the amount that should have been generated from the original assumed kerogen content.

In migration volumetrics, it is important to estimate the original petroleum potential of the source rock—not just its present measured potential (with increasing [[maturation]], a portion of the original potential will have been realized and is therefore unmeasurable). Estimates of expelled hydrocarbons may be derived by measuring the amount remaining in a source and subtracting that value from the amount that should have been generated from the original assumed kerogen content.