Navigation:  Prospect/Field evaluation > Resource plays

Resource plays are defined by the SPEE as:

1. Wells exhibit a repeatable statistical distribution of estimated ultimate recovery (EUR).

2. Offset well performance is not a reliable predictor of undeveloped location performance.

3. A continuous hydrocarbon system exists that is regional in extent.

4. Free hydrocarbons (non-sorbed) are not held in place by hydrodynamics.

(See SPEE Monograph 3, 3rd edition 2013)

 

In REP, resource plays are modelled in two ways:

1. Volumetric calculations are made using the conventional resource facilities with the addition of a sorbed phase. Not all the conventional resource features are necessary or even valid, of course.

2. Statistical estimates can be made using the calculator. When running a resource play the calculator may be accessed from the "Calculate | Statistical estimates" menu item, and the estimates are bundled up with the other prospect data. Several typical estimators are pre-defined if you are working with a resource play.

In mature plays the second approach is recommended - especially by SPEE. But in many parts of the world shale plays are undeveloped, and even where well data are available, rarely of the quality or quantity deemed necessary by SPEE. It is therefore necessary to combine volumetric estimates with analogue data on EUR's, well spacings etc..

Resource plays can be risked like any other prospect. By analogy with conventional plays the current risking scheme has two main categories: play and sweet spot. Individual risk elements within each category reflect resource play issues.

 

Currently the resource play calculations are released as a beta version. Your feedback is most welcome. Further features are being developed: for example, using structure maps and gas/condensate/oil window depths to estimate different resource phases.