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Line 65: + + − The upper map below is a hypothetical migration pathway map. The lower map shows the thickness of source rock, the top of the oil and gas windows, and the drainage areas for two traps labeled A and B of the same area shown in the upper map. The drainage areas for traps A and B were made using the migration pathway map.+ − − [[file:migration-of-petroleum_fig7-12.png|thumb|{{figure number|7-12}}See text for explanation.]]
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==Estimating drainage area==
==Estimating drainage area==
It is important to make a migration map showing the location of the source rock facies and the drainage areas that feed the areas of interest. The map is best drawn for the time when [[maturation]] analysis indicates the hydrocarbons should be migrating. A rougher estimate can be made from a map or the stucture as it exists today. A drainage map is made from the migration map. It should include estimates of maturity and hydrocarbon yield in an appropriate number of area classes. Subareas within these classes are defined by thickness and yield variation within the total drainage area.
It is important to make a migration map showing the location of the source rock facies and the drainage areas that feed the areas of interest. The map is best drawn for the time when [[maturation]] analysis indicates the hydrocarbons should be migrating. A rougher estimate can be made from a map or the stucture as it exists today. A drainage map is made from the migration map. It should include estimates of maturity and hydrocarbon yield in an appropriate number of area classes. Subareas within these classes are defined by thickness and yield variation within the total drainage area.
[[file:migration-of-petroleum_fig7-12.png|thumb|{{figure number|1}}See text for explanation.]]
==Example drainage map==
==Example drainage map==
[[:file:migration-of-petroleum_fig7-12.png|Figure 1]] is a hypothetical migration pathway map. The lower map shows the thickness of source rock, the top of the oil and gas windows, and the drainage areas for two traps labeled A and B of the same area shown in the upper map. The drainage areas for traps A and B were made using the migration pathway map.
==Example of calculating volume==
==Example of calculating volume==