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East Breaks petroleum system (view source)
Revision as of 20:15, 30 January 2014
, 20:15, 30 January 2014→Petroleum system processes: more from page
==Petroleum system processes==
==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]]).
This subsection details aspects of this generation-migration-accumulation model.
* [[East Breaks trap formation]]
* [[East Breaks trap formation]]
* [[East Breaks geochemistry of two oils from east breaks]]
* [[East Breaks geochemistry of two oils from east breaks]]