The Demand for Near-field Opportunities
Injectites, remobilized unconsolidated sands, are commercially attractive targets due to their exceptional porosity-permeability, productivity, and particularly in the case of North Sea Tertiary injectites, their abundance and close proximity to existing field infrastructure. Mature basins declining in production, such as the Viking Graben, need near-field or extended-reach tie-backs above and adjacent to producing reservoirs to supplement production and prolong field life, and injectites offer just that. Even modest-sized injectite features can represent attractive, relatively shallow, near-field objectives.
The challenge has been to discriminate hydrocarbon-filled high porosity-permeability features from tight or dry reservoirs. Conventional band-limited seismic data is too unreliable to accurately image injectite complexity as they are relatively narrow, have enigmatic geometries, and disappointing wells show not all are hydrocarbon-charged. TGS have devised a solution using GeoStreamer to resolve injectites with detailed broadband processing and characterization.
GeoStreamer Enables Robust Seismic Inversion to Reveal Hidden Prospectivity
GeoStreamer delivers a broader seismic bandwidth than conventional ‘band-limited’ methods. Additional high and especially low frequencies (down to 3-4 Hz) result in wavelets with significantly less side-lobe energy. This significantly improves data interpretability as side-lobe energy can present false leads in the form of misleading seismic horizon artifacts. The lower frequencies also introduce more background trend information to the seismic response, allowing clear definition of geological boundaries.