East Breaks petroleum system
The East Breaks 160-161 minibasin is an example of where more than one petroleum system can charge the same trap. It contains all the components required for generation, migration, and accumulation of hydrocarbons.
Petroleum system elements
Petroleum system processes
Petroleum system processes include trap formation; source-rock maturation; and generation, expulsion, secondary migration, and accumulation of hydrocarbons within a trap. Modeling of oil generation within the East Breaks 160-161 minibasin suggests that middle Miocene strata would have begun to generate hydrocarbons only 200,000 years ago and would still be active today. If older strata are the source of the petroleum, then generation must have been delayed until the late Pleistocene.
An alternative is that the petroleum has migrated after 1.2 Ma from older traps into the East Breaks 160-161 ''Glob alt'' through ''Trim A'' anticlinal traps. Periodic vertical migration of oil probably took place along growth faults between overpressured source beds and more normally pressured reservoirs. Oil accumulated in faulted rollover anticlinal traps with slightly overpressured mudstone seals. Biodegradation of oils reflects shallow accumulation prior to burial of the reservoirs below temperature::140°F (temperature::60°C).
See also
External links
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