Changes

[[file:migration-of-petroleum_fig7-13.png|thumb|300px|{{figure number|1}}Efficiencies of the expulsion, migration, and entrapment processes. After Magara.<ref name=ch07r5>Magara, K., 1980, [http://archives.datapages.com/data/bulletns/1980-81/data/pg/0064/0012/2100/2108.htm Evidences of primary migration]: AAPG Bulletin, vol. 64, p. 2108–2117.</ref>]]

[[file:migration-of-petroleum_fig7-13.png|thumb|300px|{{figure number|1}}Efficiencies of the expulsion, migration, and entrapment processes. After Magara.<ref name=ch07r5>Magara, K., 1980, [http://archives.datapages.com/data/bulletns/1980-81/data/pg/0064/0012/2100/2108.htm Evidences of primary migration]: AAPG Bulletin, vol. 64, p. 2108–2117.</ref>]]

Typical oil expulsion efficiencies are estimated to be in the 5-10% range, with values in the 15% range uncommon and 30% rarely demonstrated. This efficiency is low because most of the source rock section contains too low a concentration of organic material to participate in the expulsion process. Efficiencies of gas expulsion are estimated to be 50-90%, with values of 75% common. Unfortunately, much of this is gas lost due to solution and does not participate in reservoir charging. For both oil and gas, expulsion efficiencies tend to increase with increasing [[total organic carbon (TOC)]]. Expulsion efficiencies for oil and gas can be as high as 70-80% for very rich, effective [[source rocks]] near preferential [[migration pathways]].

Typical oil expulsion efficiencies are estimated to be in the 5-10% range, with values in the 15% range uncommon and 30% rarely demonstrated. This efficiency is low because most of the source rock section contains too low a concentration of organic material to participate in the expulsion process. Efficiencies of gas expulsion are estimated to be 50-90%, with values of 75% common. Unfortunately, much of this is gas lost due to solution and does not participate in reservoir[[Calculating charge volume| charging]]. For both oil and gas, expulsion efficiencies tend to increase with increasing [[total organic carbon (TOC)]]. Expulsion efficiencies for oil and gas can be as high as 70-80% for very rich, effective [[source rocks]] near preferential [[migration pathways]].

==Procedure==

==Procedure==