Discussion
..................... is the movement of petroleum from non-reservoir rocks to reservoir rocks.
Answer: B
The movement of petroleum from non-reservoir (source) rocks into reservoir rocks is primary migration.
Oil and gas generated in a fine-grained source rock such as shale are first expelled out of it into an adjacent permeable carrier or reservoir bed. Secondary migration is the later movement through the carrier and reservoir rocks, driven by buoyancy, until the hydrocarbons are held in a trap.
Seepage is the escape of hydrocarbons to the surface, and 'tertiary migration' is used, where at all, for the remigration of oil out of an existing trap, so neither describes expulsion from the source rock.
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