Comparing core analyses and well logs using a Hungarian gas field as example

The purpose of this study was to build small-scale genetic models of a reservoir by comparing the small and medium scale information derived from core analyses and well logs. The examined gas field is situated in the eastern part of the Pannonian Basin System. For the numerical solution several one (univariate) and multivariable (multivariate) statistical methods were used to describeone and multidimensional similarities. Finally a multivariable identifying model summarizes the information gained in different scales. The analyses showed that there was a correlation between the rock physical properties and the shapes of well logs. The porosity and the permeability did not depend on the individual log shapes but the most typical log shapes of the rock body which resulted from the electro-facies. The oscillation of the pore throat size distribution caused small changes on the log. This model can be regarded as a tool for classifying new information according to the genetic hierarchy identified.