Department of Geology, University of Nigeria, Nsukka, Nigeria
Mode, A.W., Department of Geology, University of Nigeria, Nsukka, Nigeria; Anyiam, O.A., Department of Geology, University of Nigeria, Nsukka, Nigeria; Egbujie, B.C., Department of Geology, University of Nigeria, Nsukka, Nigeria
This study illustrates how real time chromatographic analysis of light hydrocarbons can provide effective fluid characterisation as the reservoir is being penetrated. For the analysis, gas chromatographic data of Methane to Pentane (C1–C5) were collected from the reservoir sections of three wells (A, B and C) in the “Beta Field”, onshore Congo basin. These gas values were plotted on the Pixler plot for the individual wells. Also, the values of their wetness, character and balance ratios were evaluated. The results obtained were compared with the fluid type standard values of the gas ratios, to identify the type of fluid in the formation. The fluid types indicated by these results were then compared with the results obtained through the analysis of the resistivity values from the three wells. These results show that both the chromatographic gas ratio analysis and the resistivity results indicate the same fluid type (oil) in the three wells. © 2014, Geological Society of India.