The main production type is the Ordovician carbonate Karst fracture-cave reservoir in Tahe Oilfield.Karst fracture-
cave displays strong "string" reflection amplitude anomaly on seismic sections.On the basis of the analysis about the
resolution of seismic data and the theoretical basis for quantitative calculation of Karst fracture-cave,we
quantitatively calculated the effective fracture-cave volume by the characterization of the strong seismic anomaly
body,apparent-volume estimation,as well as volume correction coefficient of estimated results correction by
statistics of a large number of numerical simulation results,and obtain preliminary results for quantitative
calculation of the volume for Karst fracture-cave in Tahe Oilfield.Furthermore,some main factors which impact the
calculation precision are analyzed.The analysis indicates that the calculation accuracy of effective fracture-cave
volume would be improved by large-scale high-precision seismic data acquisition,further development of
application new prestack depth migration technologies suitable for accurate imaging of fracture-cave,and much
systematical physical modeling in the nextstep.
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