Changes

==Chemical potential==

==Chemical potential==

[[file:migration-of-petroleum_fig7-2.png|thumb|300px|{{figure number|2}}Diffusion of gas in water as a function of concentration at origin and distance from origin. After Klimenko.<ref name=ch07r3>Klimenko, A., P., 1983, Diffusion of gasses from hydrocarbon deposits, in Petroleum Geochemistry, Genesis, and Migration: AGI Reprint Series, vol. 1, p. 117–122.</ref> Copyright: AGI.]]

[[file:migration-of-petroleum_fig7-2.png|thumb|300px|{{figure number|2}}Diffusion of gas in water as a function of concentration at origin and distance from origin. After Klimenko.<ref name=ch07r3>Klimenko, A. P., 1983, Diffusion of gasses from hydrocarbon deposits, in Petroleum Geochemistry, Genesis, and Migration: AGI Reprint Series, vol. 1, p. 117–122.</ref> Copyright: AGI.]]

Diffusive forces spontaneously transfer hydrocarbons dissolved in water from areas of higher concentration to adjacent areas of lower concentration. The kilometers-long diffusion gradients of benzene and toluene within reservoirs demonstrate the effectiveness of this process. However, the lack of significant transport of benzene and toluene through barriers or seals indicates diffusion and active aqueous solution transport are minor mechanisms of the [[accumulation]] process. [[:file:migration-of-petroleum_fig7-2.png|Figure 2]] shows the diffusion of gas in water as a function of concentration at origin and distance from origin (free hydrocarbons).

Diffusive forces spontaneously transfer hydrocarbons dissolved in water from areas of higher concentration to adjacent areas of lower concentration. The kilometers-long diffusion gradients of benzene and toluene within reservoirs demonstrate the effectiveness of this process. However, the lack of significant transport of benzene and toluene through barriers or seals indicates diffusion and active aqueous solution transport are minor mechanisms of the [[accumulation]] process. [[:file:migration-of-petroleum_fig7-2.png|Figure 2]] shows the diffusion of gas in water as a function of concentration at origin and distance from origin (free hydrocarbons).