New Correlations of Condensate Gas Ratio (CGR) – Part 1: A Case Study of Eastern Niger Delta Region

This work aimed at the use of regression method to develop Condensate gas ratio (CGR) correlations using data set obtained from Eastern Niger Delta region. The procedure of dividing the formation into three distinct geologic zones was adopted. These zones are: Transitional Paralic, Paralic and Marine Paralic zones. The basic parameters used for the correlation development are: reservoir depth (ft), reservoir pressure (psia); reservoir temperature (oF) all at Gas – Oil - Contact ( GOC) / Gas – Down – To (GDT) / Gas – Water – Contact (GWC) and these parameters are obtained from the field data. Matlab and Excel softwares packages were used as the implementation platform. Both quantitative and qualitative assessments were employed to evaluate the accuracy of the new correlations to the experimental values. The models have very impressive statistical parameters with good ranks and better performance plots. The correlations developed among others considerations form a strong technical background for booking of gas-condensate reserves.