1. Deer-Boar Petroleum System at Critical Moment
Raven A’ A
Owens
Marginal
Teapot
Reservoir Rock
Pod of Active
Source Rock
Big Oil
Just
Hardy
[the Deer-Boar is a fictitious name for a conceptual model petroleum system]
Map view of the geographic extent of the Deer-Boar petroleum system at the critical moment (250 Ma).  Thermally immature source rock (Light green) is outside the oil window.  The pod of active source rock (pink) lies within the oil and gas windows.  Critical moment refers to the time that best depicts the generation-migration-accumulation of hydrocarbons in a petroleum system. In fact, it is an interval of time rather than a geologically instantaneous moment.
Lucky
David
Immature Source Rock
Zero Edge of
Reservoir Rock
Magoon and Dow, 1994