Seismic attributes prediction of Ordovician carbonate karst reservoirs in YQ area
In the Ordovician carbonate reservoirs in YQ area,karst cavities and fractures are dominant.The reservoirs are difficult to predict due to severe reservoir heterogeneity and drastic lateral changes as well as the effects of interstitial material and filling degree on cavities.Based on the characteristics of the geophysical response of the Ordovician carbonate reservoirs,a seismic prediction technology has been developed,including seismic attributes optimization,multi-attribute integration,and voxel attributes delineation.The technology has been applied to predict Ordovician karst reservoirs and top weathering crust reservoirs.The spatial distribution of the two types of reservoirs has been qualitatively described and analyzed,and the results coincide with practical drill data.