Building a Stochastic Geophysical Workflow for Consistent Prospect Targeting: a North Sea Case Study

When modelling basins for targeting and ranking new prospects at exploration stage, time-depth conversion of seismic horizons is a major source of uncertainty. This paper describes a North Sea case study, where the interpretation from two partially overlapping seismic surveys is combined into consistent single depth maps of key horizons with reliable confidence intervals attached. The result is the consistent and automated computation of structural spill points localization and closure probability maps, extending the P10_P90 prospect volumetric range by a factor of 2.5 when benchmarked against existing knowledge based structural interpretations.