Beicip-Franlab will present the following talk at IAP 2019, Algeria.
Methodology for Multi-Component Inversion
N. de Freslon, N. Lucet, N. Desgoutte
Seismic inversion, carried out on PP wavefield data, is widely used to assess elastic parameters related to reservoir properties. When available, PS seismic data can help significantly enhancing the image of the reservoir. PP-PS joint inversion allows the use of two independent wavefields to provide an enhanced S-impedance along with an optimized density, in addition to the P-impedance already obtained with high quality using PP data only. The combined use of these three parameters increases our ability to predict lithology and fluid distributions from seismic data.
In this case study, the presence of a gas cloud leads to strong amplitude dimming, increasing drastically the uncertainties about the reservoir properties. Using joint inversion allows to overcome this imaging issue by using PS wavefield - not affected by the presence of gas - in addition to PP wavefield. PP-PS joint inversion allows obtaining:
- Optimized P and S-impedance and density.
- Better reservoir architecture in the area affected by the gas presence.
Density section resulting from PP-PS inversion