The carbonate reservoirs of the Middle and Lower Ordovician in southern Tahe oilfield are mainly of fractured-vuggy type featured in effective fractures and rugs formed by dissolution.The distribution of fractures in these reservoirs is controlled by faults

the oil layers are thin

and water bodies are active.The fracture-rug combinations are of different scales

irregular spatial distributions

and various filling properties.In view of the characteristics of the fractured-vuggy carbonate reservoirs in the study area

two techniques are presented

namely the pre-staek anisotropy analysis technology for detecting the intensity and azimuth of fractures and the pre-stack elastic parameter inversion method for predicting

in combination with log data

the growth of the fractured-vuggy zones and fluid-bearing indicators.The application of the techniques in southern Tahe oilfield reveals that the prediction results are basically consistent with data gathered from the known fractured-vuggy reservoirs and drilling data.The application of these two techniques has improved the prediction of spatial distribution of smallscale fractured-vuggy reservoirs and also shows that there are several favorable fraetured-vuggy zones distributed in the southern Tahe oilfield.