ABSTRACT
There are many variables that ultimately affect economic success of a well. These include formation thickness (i.e., net pay height, h), porosity, and water saturation, and most of these formation properties can be measured with varying degrees of accuracy using openhole logs, core correlations, etc. All of these properties affect the “gas in place” and thus may control the decision as to whether a given formation is worth fracturing. However, none of these properties directly impact the actual treatment design. The only reservoir properties of direct interest to fracture design are permeability, k, that is, the property controlling how easily gas/oil µows through the rock and drainage area (since there is little to be gained by fracturing into an area already drained by another well). Unfortunately, permeability is very dif-žcult to determine from log data with any consistent, reasonable accuracy.
