Shallow and Deep Seismic Amplitude Anomalies Indicate Times of Fluid Accumulation and Tectonic Activity in the Barents Sea

Abstract

This master thesis studied the 3D-seismic dataset ST0825 located in the southwest Barents Sea. Aiming to map seismic anomalies and faults above and below the Upper Regional Unconformity (URU). The survey partly covers four different structural elements: Finnmark Platform, Tromsø Finnmark Fault Complex, Hammerfest Basin and Ringvassøy Loppa Fault Complex, south to north respectively. These areas are all affected by the tectonic activity from the Caledonian orogeny to lastly the creation of the North Atlantic Ocean. Making the study area complex with different faulting orientations and activity timing. The lithostratigraphy of the survey were mapped with the help of wellbore 7119/12-1, 7119/12-4 and existing publications. The different faults are mapped and categorized into First – Third class. Also, the seismic anomalies are mapped, interpret and discussed. In the survey, there are indications of migration hydrocarbon using mainly faults as migration pathways. There were also mapped a polygonal fault system, the same as Ostanin et al., (2012) mapped in the Hammerfest Basin. There were not found any indications that there have been tectonic activity post-URU, but there were indications that there has been fluid flow activity after its deposition with pockmarks mapped on the seafloor.