--> Multi-Attribute Analysis of Penobscot Survey, Offshore Nova Scotia
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Multi-Previous HitAttributeNext Hit Previous HitAnalysisNext Hit of Penobscot Survey, Offshore Nova Scotia

Abstract

The Penobscot 3D Survey from the Canada-Nova Scotia Offshore Petroleum Board is a well known and studied dataset. The Penobscot L-30 well, drilled within the boundaries of the survey, encountered hydrocarbons in 5 sands within the upper half of the Cretaceous Middle Missisauga Formation just below the “O” Limestone Marker. The Penobscot B-41 well was drilled to the west of the L-30 in anticipation of having updip potential but was ultimately found to have similar sands within only 20m depth of the L-30 markers and with no indications of significant hydrocarbons. Seismic attributes show different geophysical characteristics within the volume, but it takes a combination of attributes to reveal the differences of the sands between the L-30 and B-41 wells. In order to extract as much information from the dataset as possible, 3 attributes with differing geophysical properties were computed and combined to interactively classify facies within the volume. Three facies were computed using a combination of an amplitude Previous HitattributeNext Hit, Texture, a thickness Previous HitattributeNext Hit, Terrace Thickness, and a frequency Previous HitattributeNext Hit, RGB Frequency Blend. The classes originated from the areas between well markers of the L-30 Middle Missisauga hydrocarbon sands, the L-30 Middle Missisauga wet sands, and the B-41 Middle Missisauga sands. The result showed volumetric facies highlighting the separation of hydrocarbon and wet sands within the L-30 well and a facies from the B-41 well that are similar to the L-30 wet sands. The hydrocarbon bearing facies is not present within the Missisauga section of the B-41 well. Differences between the wells can be seen with individual attributes, but they are more accurately classified and visualized with the multi-Previous HitattributeNext Hit Previous HitanalysisNext Hit. This multi-Previous HitattributeNext Hit Previous HitanalysisTop resulted in a hydrocarbon facies from the L-30 well that could also be used to define other possibly potential pay zones of the Middle Missisauga within the Penobscot dataset.