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Innovative Approaches to Seismic Data Interpretation - Building Reliable Depositional Models of Fluvial Systems
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 5
Abstract
In accordance with many researches, paleo-riverbeds and associated with them sand bodies of alluvial genesis are of the utmost interest in searching for hydrocarbon accumulations as they represent reliable lithological traps. Pontian-Pliocene riverbed sequences of the Pannonian Basin deposited in the settings of lacustrine-fluvial plain are no exception. In recent years, large amount of 3D CDP seismic investigations was carried out. Interpretation of the obtained data allows forming a general understanding of paleoriverbed systems distribution, tracking their stage-by-stage areal variations over the long geological time. Seismic interpretation carried out in the sequence formed in the settings of lacustrine-fluvial plain demonstrated a number of specific problems. The first problem concerns correlation of paleo-isochrone surfaces. The second problem lies in the fact that the smoothed versions of interpretation that are usually sufficient for structural imaging are not optimal for seismic facies analysis. As a result, authors have developed own object-based interpretation technique that allows significant improvement of its quality and information content. The approach is called “Pathfinder”.This method allows moving to a fundamentally new level of seismic facies and sedimentary analysis. There emerges the possibility to create a more accurate depositional model that meets all the requirements of geological modelling.