Using [[:file:petroleum-systems_fig3-19.png|Figure 2]] and stipulating that the complementary play is on the migration path for this petroleum system, a play located within or outside the geographic extent of the system has the following level of risk: | Using [[:file:petroleum-systems_fig3-19.png|Figure 2]] and stipulating that the complementary play is on the migration path for this petroleum system, a play located within or outside the geographic extent of the system has the following level of risk: |