Abstract
Abstract Recent exploration has relied heavily on detailed biostratigraphic correlations using foraminifera and calcareous nannoplankton, particularly in salt flank positions poorly imaged by seismic. Shell’s Bonnie, a deep near-salt well, was drilled at Eugene Island Block 95 to the depth of projected amplitude anomalies without encountering significant sand bodies. Detailed palaeontological correlation to nearby wells verified that the objective section had been penetrated. Objective sands were interpreted to be missing because of stratigraphic thinning on to the dome. A sidetrack well encountered significant hydrocarbon reserves. Appraisal drilling in the Mars basin (Mississippi Canyon blocks 763, 806 and 807) was aided by the recognition of regional condensed sections between gravity-flow units providing correlation of individual reservoir units within the field. Biostratigraphy showed stratigraphic pinch-out of reservoir sands rather than absence from erosional or structural truncation near vertical salt faces. The interpretation improved volume estimates and the planning of future wells.
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