In this study, the ratio of Vp / Vs is 1.5-1.7 for gas saturated rock.

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ABSTRACT

Reservoir characterization analysis has been carried out for identifying lithology and À uid content on TalangAkarFormation in South Sumatra Basin. Robust method that being used in this study is the simultaneous inversion which uses pre-stack gather and well log data from Puja A and Puja B. Elastic parameters resulted from simultaneous inversion are P Impedance, S Impedance and V_p / V_s ratio. Lambda-Rho parameter OU and Mu-Rho PU derived from P impedance (I_p) and S impedance (I_s). Lambda-Rho is sensitive to À uid content while Mu-Rho to lithology. Area of interest in this study is Talang Akar Formation as reservoir which contains gas with Lambda-Rho (OU) between 5-15 (GPa*g/cc) and Mu-Rho PU 35-45 (GPa*g/cc).

The ratio of P wave (V_p) and S wave (V_s) can be used as an indicator to determine À uid saturation. Gas saturated rock has value of V_p / V_s lower than the water saturated rock. In this study, the ratio of V_p / V_s is 1.5-1.7 for gas saturated rock.

Keyword:Simultaneous Inversion, Lambda-Rho, Mu-Rho, V_S/V_s

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