The mathematical regularities modification of the concept of pore connectedness for petrophysical modeling of filtration and capacity properties of oil-bearing rocks

Abstract

Introduction. The concept of pore connectedness (CPC) has been successfully using for the last 10 years in the perimeter of the Gazprom neft companу group for petrophysical modeling of the filtration and capacity properties (FCP) of oil and gas reservoirs. During this time, an extensive information base on the objects of petrophysical modeling has been accumulating. Because of systematization of the experience gained, the basic mathematical patterns were optimizing. In some cases, it was possible to establish functional dependencies between the constants of the models, which made it possible to reduce the number of determining parameters in the equations used and increase their versatility for describing the reservoir properties of rocks of various genesis.

The аim of this work is to modify the mathematical apparatus of the CPC to improve the efficiency of petrophysical modeling of the filtration and capacity properties of rocks.

Materials and methods are basing on the analysis of the key results of constructing petrophysical models of the FCP of productive deposits for more than 80 fields located in the main oil and gas provinces of the Russian Federation.

Results. Modified equations of the CPC for description of reservoir properties.

Conclusion. The modified equations allow more efficient descript of reservoir properties behavior, using a relatively small number of input data. The universality of the obtained regularities for different types of deposits, as well as the identity of the determining constants for deposits — petrophysical analogues are noted.