Malaysian Journal of Geosciences (MJG)

The study on petrophysical properties have been conducted. The wells (X1, X2 and X3) in the Zeta Field may be developed if the result of investigation is appreciable as it is necessary for well development, well bore stability and could be used to characterize oil reservoirs. Microsoft excel was adequate for the data processing and analysis. The petrophysical properties results for well X1 include average values of water saturation, porosity and permeability as 0.30 (30%), 19% and 10.36 millidarcy. This means that about 70% hydrocarbon saturation could be available with adequate connectivity of pores for accumulation and migration of reservoir fluids. For well X2, the average is 0.16 (which is 16%), 30%, and 21.54 millidarcy respectively. Therefore, the hydrocarbon saturation is about 84% with a very good class of porous formation and therefore can store and transmit fluid. The average noted from well X3 for water saturation, porosity and permeability correspond to 0.27 (27%), 24% and 13.42 millidarcy. The average results of the other properties studied include Shear Modulus, Lame`s Constant, and Young`s Modulus as 9.20 x 109 N/m2, 5.0 x 1013 N/m2 and 2.12 x 1010 N/m2 ,respectively from well X1. Also, the average obtained from well X2 are 3.94 x 109 N/m2 for Lame`s Constant, 5.82 x 109 N/m2 for Shear Modulus and 1.34 x 1010 N/m2 for young`s modulus. Well X3 findings have the average results as Shear Modulus = 7.64 x 109 N/m2, Lame`s Constant = 5.18 x 109 N/m2 and young`s modulus = 1.77 x 1010 N/m2. These results indicate that the studied reservoir formation is brittle and wells could stand a test of time. This information implies that the hydrocarbon saturation is about 73%, highly porous and has the ability to accumulate and migrate fluids. The results of their dependent parameters are presented in section 4. Properties like acoustic impedance and shear impedance have an average of 7.5 x 106 and 4.6 x 106 for well X1, 5.7 x 106 ,and 3.5 x 106 for Well X2; 6.7 x 106 and 4.1 x 106 ,for Well X3 respectively.