Abstract
The confidence and the ability to predict reserves more accurately play an important role in developing a reservoir (conventional and unconventional). The role of Net Pay is very important in unconventional volumetric calculation of hydrocarbon resources, a practice that strengthens the relative worth of the Petroleum Industry. However, the estimation of resources has no universal definition of the concept neither is there a widely accepted procedure or methodology for its determination and incorporation. In unconventional reservoirs, these shortcomings become even more glaring where there is scarcity of reservoir data for assessing the storage properties of reservoir rocks and flow behavior. In improving the current situation of estimating Net pay in unconventional reservoirs, an assessment of the concept (Net Pay) together with contemporary method of determining it was carried with the aim of determining its application to Unconventional Gas Reservoir (UGR). In this paper an integrated rock typing approach is proposed as an alternative method of assessing reservoir quality for unconventional gas reservoirs that exhibit significant deviations for the Archie Criteria or Formula termed “problematic Reservoirs” by Worthington (2011).
