Karakterisasi Reservoir Menggunakan Metode Inversi Stokastik, Analisis Petrofisika, dan Multiatribut Seismik pada Lapangan "Purwo" Cekungan Sumatra Selatan = Reservoir Characterization Using Stochastic Inversion, Petrophysical Analysis, and Seismic Multi-Attribute Techniques in the "Purwo" Field, South Sumatra Basin