Seismic Expression of Deep-Water Fan with an Example from Triassic in Southwestern Barents Sea
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Generation of high-quality 3D seismic data and easy access to this data across the deepwaterenvironments together with the prior interest of oil companies in the deep-waterexploration has attracted geoscientists to the thorough understanding of the deep-waterdepositional systems over the past few years. In this thesis work, 3D seismic data withseveral interpretation techniques gave the opportunity to demonstrate seismic expressionof deep-water fan with an example from the Triassic in the southwestern Barents Sea. Inorder to perform a flawless analysis, it is significant to understand the internal architectureand development phases of the fan system by seismic expression of each depositionalelement in plan- and cross-sectional views.The combination of flattening method with RMS seismic attribute is applied todemonstrate the evidences of fluvial and deep-water depositional systems in the upper(Snadd) and the lower (Havert) part of the Triassic formations. The advanced methodssuch as model and geobody extractions are performed to confirm the internal architectureof deep-water fan which is accurately presented in the image extracted by flattening ratherthan regular interpretation methods. Integration of plan- and cross-sections provides abetter understanding of geomorphologic analysis which leads to categorize depositionalelements such as main feeder channel, crevasse splay and channels, distributary channelsand channelized lobe complex deposited within a low shelf to basin floor setting. Theseelements are generated through the development of fan system from initiation and growthphases to retreat phase. There exist similarities and differences in the architecture offluvial and deep-water channels; the similarities are in shape, stream width and sinuosityratio while the stream lengths are different for both channel systems. These comparisonsalso show that the seismic expression of deep-water system is clearly visible in the datarather than the fluvial counterparts.