Changes

==Complementary play==

==Complementary play==

The '''complementary play''' evaluates the exploration risk for finding undiscovered hydrocarbons associated with a particular petroleum system.

The '''complementary play''' evaluates the exploration risk for finding undiscovered hydrocarbons associated with a particular petroleum system.

First, the petroleum system case study is completed. As the case study develops, an idea(s) or play(s) that involves this petroleum system will occur to the investigator. This play complements the petroleum system because it could add hydrocarbons (if discovered) to the system.

First, the petroleum system case study is completed. As the case study develops, an idea(s) or play(s) that involves this petroleum system will occur to the investigator. This play complements the petroleum system because it could add hydrocarbons (if discovered) to the system.

The events chart on the next page shows how the risk chart for the complementary play (prospect) is related to the petroleum system vis-a-vis the three independent variables—trap, petroleum charge, and timing.

The events chart in [[:file:petroleum-systems_fig3-18.png|Figure 2]] shows how the risk chart for the complementary play (prospect) is related to the petroleum system vis-a-vis the three independent variables—trap, petroleum charge, and timing.

The experience acquired while executing the petroleum system case study provides the measure of difficulty in mapping and determining the age of the essential elements and, more importantly, for the two processes—trap formation and generation-migration-accumulation of petroleum. Obviously, there is no risk or uncertainty related to the discovered accumulations in the petroleum system, but there are varying levels of difficulty in the reconstruction of events that caused these accumulations. This measure of difficulty can be incorporated into the risk chart.

The experience acquired while executing the petroleum system case study provides the measure of difficulty in mapping and determining the age of the essential elements and, more importantly, for the two processes—trap formation and generation-migration-accumulation of petroleum. Obviously, there is no risk or uncertainty related to the discovered accumulations in the petroleum system, but there are varying levels of difficulty in the reconstruction of events that caused these accumulations. This measure of difficulty can be incorporated into the risk chart.

Using the risk chart in this manner allows the investigator and prospect evaluator an opportunity to separate what is known on the events chart from what is unknown on the risk chart for the prospect.

Using the risk chart in this manner allows the investigator and prospect evaluator an opportunity to separate what is known on the events chart from what is unknown on the risk chart for the prospect.

==Assigning risk==

==Assigning risk==