The Seismic Faces of Atoll Carbonate Reservoirs by the Trace Shape Analysis

In this work we present interpretation study of 3D seismic research of oil-filled carbonate<br>bodies, which have been estimated as structures with low-size and small height (south-east<br>margin of Russian Plate). Two types of organic limestone structures (bioherm and biostrome)<br>were detected in the seismic cube and that also have been confirmed by log data and exploration<br>drilling. Seismic trace shape analysis by supervised and unsupervised approaches showed arched<br>chain of biostromes and internal groups of bioherms. Most of them are revealed for the first<br>time. Authors suggest a lithofacies model of Aitov area organic limestone massif as a part of<br>atoll with lagoon, reef chain, outer shelf and tide way.