This paper focuses on fractured carbonate reservoirs prediction with sparsely acquired wide azimuth seismic data with shot line and receiver line interval 400 meter respectively. Spatial aliasing, acquisition footprints, uneven distribution of azimuth and offset caused by insufficient spatial sampling result in difficult fracture identification and prediction. A geo-technical scheme helps to get good fractured carbonate reservoirs prediction: 5D interpolation makes the shot line and receiver line doubled, coverage increase to 4 times, spatial aliasing and acquisition footprint eliminated, offset distribution more uniform. 5D OVT (offset vector tile) regularization performs interpolation first for offset, then regularizes azimuths to ensure azimuth more uniform without increasing coverage number. Azimuthal anisotropy correction for eliminating amplitude changes with azimuth is performed with snail gathers from OVT pre-stack time migration, which lays a foundation for fracture prediction. Fitting out the attribute ellipse to predict the orientation and strength of the fracture on the basis of effective offset selection, azimuth division optimization, and sensitive attribute selection.
The predicted fractures are consistent with those interpreted with formation micro-scanner image (FMI); it is further proved that the method proposed in this paper is applicable and reasonable. Favourable fractured reservoir zones for subsequent oil and gas development are described.
Number of Pages
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