Inventory Verification Isopore Volumetric Method

Abstract

There are various analytical methods available to the reservoir engineer for verifying the inventories of underground gas storage. Some methods are more adaptable than others to a particular type of reservoir or set of reservoir conditions. The methodology described herein is primarily applicable to gas storage reservoirs that were developed from depleted gas production fields.

The volumetric formulae are sensitive to changes in the variables involved in the equations. Therefore, when calculating the gas content in a heterogeneous reservoir, care must be taken to compensate for the disparity in porosity as it occurs throughout the reservoir. The isopore method provides the means to properly delineate this change in reservoir porosity.