Navigation:  Prospect/Field evaluation > Input parameters > Economic cut-offs

An economic cut-off allow you to define minimum amounts of recoverable oil and gas which must be discovered for a field to be economic. You may define a cut-off for oil or gas or both. If either cut-off exceeded, the result is an "economic success".

The liquids phase used can be either recoverable oil, condensate liquids, total recoverable oil or BOE. The gas phase can be recoverable gas, gas from condensate or total recoverable gas.

The reserve used in the calculation is the whole trap number. When you are looking at a results graph, the cut-off is shown as a vertical line. If the graph is showing whole trap reserves, the line will be in the right place. If you are showing "company share" data, the line will still be in the right place, but it will be at the cut-off times company share (NRI).

See 'Understanding the Results' for a discussion of how the results presentation is modified if you use an economic cut-off.

Some people consider that using an economic cut-off in a reserves calculation is inappropriate and even dangerous. Usually such people are financial analysts who think the topic of money is beyond a mere geoscientist. For this reason you can disable cut-off application and entry as part of the Site Customization section, refer to the 'Installation Options' help page for more information on how to do this.

 

Important note: do not put zero volumes! If you put zero for gas and there is no gas, it will fail the test.