Submarine landslide and associated polygonal faults development: a case study from offshore Norway

Submarine slide and polygonal faults have been investigated using high-resolution 3D seismic data, over an area of 2,300 km2. The study is located on the continental slope, offshore Norway. sliding covers more than half area, part Storage slide. developed a series extensional at upper zone which gradually changed to chaos facies, interpreted as mass transport deposits. There no clear evidence compression/contractional downslope. Polygonal are highly in KS1 KS2 interval, corresponding Lower Miocene age. fault has small offset c. 10÷30 ms TWT, spacing ranges between 500 m 1 km. Within this faulted tend develop intensively below submarine much less out that area. Bright amplitude anomalies observed within north south – elongated anticline structure. It mapped 135 km2 coinciding with top anticline. Among those, there two obvious negatives, bright reflectors relatively flat 2670 TWT (flat spot 1) 2800 2). These spots hydrocarbon-brine contacts. Flat 2 bounded by structure contour but for unconformable lithologic reflections from trap boundary, thus still needs be confirmed well data. suggest existence hydrocarbon trap, addition, occurrence linked seal potential covering underneath petroleum reservoir, proving great