ESTIMATION OF PETROPHYSICAL PARAMETERS OF THE HYDROCARBON RESERVOIR THROUGH WELL LOG ANALYSIS

Abstract

This report presents the log analysis results of a suit of Petrophysical well logs comprising of caliper log, gamma ray log, spontaneous log, neutron log, density log, combination neutrondensity log and resistivity log from four wells namely K, L, M, and N of the field "ESI3JR". 1-lere the basic objective of well log analysis is carried out to identif' the hydrocarbon -bearing reservoir(s), and quantitative estimation of different zone of hydrocarbon reservoir's parameters like porosity, water saturation, hydrocarbon saturation and amount of hydrocarbon reserves. The well log data is used for both qualitative and quantitative analysis. The qualitative interpretation consists of formation rock types like sandstone, limestone and dolomite and formation fluid types' water, oil and gas. The quantitative interpretation consists of quantitative estimation of the thickness of the hydrocarbon zone, porosity and water saturation which are used to calculate the amount of oil and gas in place. Qualitatively, with the help of GR log, SP log and neutron-density cross plot, I can decide that the hydrocarbon reservoir's zones of interest from different wells of the field 'ES13JR" is porous and permeable sandstone. The computed values, of effective porosities from different zones of the interest of the four wells vary from 18.42 % to 47.00 % for the Oil-bearing zone and 18.42 % to 31.28 %for Gas-bearing zones. The computed values of saturation vary from 21.55 % to 52.06 % for Oil and 79.70 % to 94.73 % for Gas. The resistivity of the water ranges from 0.1379 Qm. to 0.35730m. i'hus the amount of the hydrocarbon reserve can be calculated using the effective porosity and the water saturation with the help of thickness of the reservoir that directly measured from the well log. The calculated Amount of Oil Originally in Place ranges from 864345.93 barrels/acre to 1170044.64 barrels/acre while the Amount of Gas Originally in Place varies from 1486640.77 cubic feet/acre to 381 849440.04 cubic feet/acre.