Reservoir Characterisation with Ocean Bottom Seismic

Reservoir areas obscured by gas anomalies are a common challenge in South East Asia. Extensive AVO compliant preconditioning and a simultaneous PP-PS elastic inversion enable a clearer reservoir interpretation in the gas obscured areas. This is demonstrated by improved well ties over the PP inversion and by more geologically consistent elastic properties within the layers.

In our case study, we demonstrated that density estimated from PP-PS simultaneous inversion of multicomponent seismic data is superior to one obtained from PP (P-wave only) seismic inversion. Superior results are obtained even in the gas cloud areas. The density estimated from PP PS simultaneous inversion was used in reservoir delineation and characterisation.