About Estimating Technical Reserves

AccuX enables you to calculate technical reserves for an area with multiple wells for a general interpretation and also to specify a realistic drainage shape for a specific well.

Reserves Calculation: Data in the Project and Initial Output

You can calculate reserves anytime after you create an AccuX project and define target layers. However, output from AccuX calculations depends on operations you've performed as defined in the following table. The combined three columns on the left define the initial output AccuX creates. To calculate reserves with default GOR, RF, Bo, or Bg, you must include the curves specified in the right-most column.

Valid
Phi Curve

Valid
SW Curve

User-Defined
Pay Layer

Initial Output

Required Input to Calculate Reserves with Default GOR, RF, Bo, or Bg

No

No

No

Total polygon area in acres

NPT, Average Phi, and Average So or Sg

No

No

Yes

Net pay area and Average NPT

Average Phi and Average So or Sg

Yes

No

No

Total polygon area in acres

NPT, Average Phi, and Average So or Sg

Yes

No

Yes

Net pay area, Average NPT, and Average Phi

Average So or Sg

Yes

Yes

No

Net pay area, Average NPT, Average Phi, Average So or Sg, and Reserves with default GOR, Bo, or Bg
 

 

Improving Calculation Accuracy

If your project area or some of the wells within it have no digital logs, or if you only want to use raster logs, you can improve the accuracy of calculations by placing user-defined pay layers to use when calculating average NPT. For details, click Creating User-Defined Pay Layers.

You can further improve the accuracy of calculations by placing user-defined isolines on the Net Pay Map. For example, you can use the isoline tool () to draw the zero-edge of the pool. User-defined isolines can also be used for geophysical prospects without wells. For example, you can draw zero-edge and expected NPT isolines at 5, 10, 15 meters, etc.

Note: If you launch AccuX from an AccuMap Detail Map, townships and sections on the AccuX map appear as closed polygons, which you can use as the volumetric polygon.