Uncovering Hydrocarbon Potential Using the Integration of SimultaneousSeismic Inversion and Rock Physics at the “NS” Field, Kutai Basin,Kalimantan
Author: Agus Riyanto, Haryono, Hotma Yusuf, Nine Safira*
nine.safira@sci.ui.ac.id
Reservoir characterization is a series of stages of evaluating, analyzing, and interpreting reservoir conditions. One method for complete reservoir characterization is the simultaneous seismic inversion method. A seismic inversion method using pre-stack data integrates several angles of incidence with wavelet associations at each angle and integrates well data. The implementation of this method can produce several rock physics properties such as Pwave velocity (Vp), S-wave velocity (Vs), density, Vp/Vs ratio, and P-wave acoustic impedance (Zp), and S-wave acoustic impedance ( Zs). In addition, Lambda-Mu-Rho and scaled-Qp (SQp) and scaled-Qs (SQs) transformations were also applied as the outputs of further rock physics models. The advantages of this transformation are the accuracy in lithological discrimination and the better type of pore fluid in the hydrocarbon reservoir. In addition, AVO modeling as AVO class classification and fluid substitution modeling simulation (FRM) was carried out. This study analyzes hydrocarbons’ potential using simultaneous seismic inversion, elastic impedance inversion, and rock physics modeling in the “NS” Field, Kutai Basin, Kalimantan. The results of this study are lateral distributions indicating the presence of gaseous hydrocarbon prospects, characterized by the definition of properties Zp, density, Lambda-Rho, Poisson ratio, and SQp with relatively low values, and properties of Zs, Mu-Rho, and SQs with relatively high values. In addition, the results of the AVO classification indicate that the gas reservoir is classified as class III with a positive AVO product value. The hydrocarbon zoning weighting was then carried out to see the zones with the highest to lowest hydrocarbon indications in the 4 Ma Formation and 7.6 Ma Formation.
Keywords: Simultaneous Seismic Inversion, Reservoir Characterization, AVO, Kutai Basin, Gas Hydrocarbons.
View Full ManuscriptDownload