Based on 3d seismic data obtained in Urnensky field, Western Siberia, Russia, an ancient<br>Usanovsky anticline of the 3d order is delineated by structural imaging. The crest of fold is not<br>characterized by drilling. Well logging analysis of the data derived from the adjacent wells suggests<br>drastic decrease of Jurassic sedimentary formation occurring towards the crest up to its complete<br>pinching-out. The main conclusion drawn from geoacoustic modelling is that the crest doesnt posses<br>any sediments of Vasyugan and Bazhen suits and it enables to predict the levels of its pinching-out.


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