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Hydrocarbon expulsion, migration, and accumulation (view source)
Revision as of 15:26, 1 May 2014
, 15:26, 1 May 2014→Migration
==Migration==
==Migration==
[[file:predicting-reservoir-system-quality-and-performance_fig9-14.png|thumb|{{figure number|1}}After Berg.<ref name=ch09r6>Berg, R., 1975, [http://archives.datapages.com/data/bulletns/1974-76/data/pg/0059/0006/0900/0939.htm Capillary pressures in stratigraphic traps]: AAPG Bulletin, vol. 59, no. 6, p. 939–956.</ref>]]
[[file:predicting-reservoir-system-quality-and-performance_fig9-14.png|thumb|{{figure number|1}}Relationship between the buoyancy pressure (P<sub>b</sub>) and the capillary resistance of the water. After Berg.<ref name=ch09r6>Berg, R., 1975, [http://archives.datapages.com/data/bulletns/1974-76/data/pg/0059/0006/0900/0939.htm Capillary pressures in stratigraphic traps]: AAPG Bulletin, vol. 59, no. 6, p. 939–956.</ref>]]
Hydrocarbon migrates through an aquifer when it is “buoyed” upward due to AP caused by the density differential of the hydrocarbons and the formation water. The oil or gas migrates in filaments through the pore system of the aquifer as long as the [[buoyancy pressure]] (P<sub>b</sub>) exceeds the capillary resistance of the water in the pore throats. This relationship is illustrated in the diagram below.
Hydrocarbon migrates through an aquifer when it is “buoyed” upward due to AP caused by the density differential of the hydrocarbons and the formation water. The oil or gas migrates in filaments through the pore system of the aquifer as long as the [[buoyancy pressure]] (P<sub>b</sub>) exceeds the capillary resistance of the water in the pore throats. This relationship is illustrated in [[:file:predicting-reservoir-system-quality-and-performance_fig9-14.png|Figure 1]].
For migration to continue as pore throat size decreases from one site to the next (points A and B in [[:file:predicting-reservoir-system-quality-and-performance_fig9-14.png|Figure 1]]), the length of the filament (''h'') must increase until an adequate P<sub>b</sub> exists across the pore throat to initiate breakthrough.
For migration to continue as pore throat size decreases from one site to the next (points A and B in [[:file:predicting-reservoir-system-quality-and-performance_fig9-14.png|Figure 1]]), the length of the filament (''h'') must increase until an adequate P<sub>b</sub> exists across the pore throat to initiate breakthrough.