Geometric correction factor

A factor applied to rock volumes to account for the pinchout of the oil or gas column at the edges of a prospect.

Affected by the gross sectional shape of the prospect. End members are a rounded dome (like half a soccer ball), which is strongly discounted with a factor of about 0.5, or a slab, which is not discounted at all, with a factor of 1.0. In between, there is a flat-topped container (like an inverted soup dish).

The geometric factor G is part of the classical volumetric equation:


 * $$V = A \times T \times G \times \phi \times N\!\!:\!\!G \times S_\mathrm{O} \times \frac{1}{B_\mathrm{O}} $$