Simultaneous inversion of the Ladybug prospect and derivation of a lithotype volume

Two offset angle seismic stacks from the Ladybug prospect (offshore Gulf of Mexico) have been inverted with a new Simultaneous Inversion algorithm, ultimately converting the seismic amplitudes into rock property models of lithotype (lithology and fluid) and porosity. To assess its effectiveness, the results of this inversion and analysis workflow were compared to those of traditional AVO analysis tools. It was determined that the Simultaneous Inversion methodology extracts a more dynamic range of information from offset seismic stacks, and results in an improved response to reservoir identification and mapping over that of traditional seismic AVO analysis. The Simultaneous Inversion generated three new volumes: acoustic impedance (Zp), shear impedance (Zs), and estimated density (ρ). These data sets then underwent further interpretive analysis of lithology and porosity to identify prospective hydrocarbon zones within the target layers