In this paper we would like to attract an attention to some frequently encountered problems arising<br>when trying to forecast the distribution of reservoir properties based on seismic data. In recent years such a<br>procedure has become very popular and has been commonly applied as a final stage of any seismic data<br>interpretation workflow. Impressive results having been presented by numerous experts (including the<br>authors of this paper) seem to convince geophysical service companies and their clients that seismic-based<br>properties prediction techniques appear to be accurate, reliable and, most of all, universal method of<br>description of complex structure of the geological medium. Thus, the results of this prediction procedure can<br>be directly implemented for reserves estimation as well as for other purposes during the planning phase of<br>development of a hydrocarbon field. However, our personal experience of dealing with various geological<br>objects in order to derive property volumes from seismic data allows us to point out some significant<br>constraints of this approach. In what follows we discuss one of such counter-examples.


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