![]() A series of semi-discontinuous, curvilinear to arcuate features are also identified on the BPSU (Fig. As a result of this, these maps clearly illustrate the dominant NNW-SSE-trending, linear orientation of the underlying clinoform units (Fig. Where the clinoformal reflections subcrop the BPSU they affect the auto- tracker software, causing the seismic pick to 'skip' down to the lower clinoform reflection. Based on the switch to glacial sediments above the surface and the region- ally developed nature of the unconformity, this sur- face is interpreted to have formed in response to encroachment of Fennoscandian ice-sheets onto the Norwegian margin continental shelf (Sejrup et al. A boundary of a similar age with an angular relationship to underly- ing seismic packages is observed 300km further north in the Haltenbanken area (Rokoengen et al. In the Troll area of the Norwegian mar- gin, a shallow borehole indicates that this surface correlates with a major lithological change from open marine mudstones and sandstones to glacio- marine and fully glacial till deposits (see Sejrup et al. 1.7 Ma and bounds the base of the Pleistocene succession (Fig. Biostratigraphic data from wells within the study area indicates that the BPSU is associated with an erosional hiatus which is dated at ca. 1995) are moderate to high ampli- tude, parallel and conformable to the BPSU. Seismic reflections within the overlying seismic package (not discussed here but correlative to CSS-9 and 10 of Jordt et al. Base-Pleistocene unconformity (BPSU) is defined on seismic data as a major angular uncon- formity with marked truncation of underly- ing seismic reflections below the horizon. A seismic timeslice that intersects SU3 at 800ms indicates subtle lateral variations in the width (and accordingly thickness) of unconformity- bounded seismic packages (units 1-5 in Fig. The clinoforms dip 1-1.5 ~ (not corrected for com- paction), and are subtly folded above the depression features developed along the BPFS with the fold amplitude decreasing upwards towards the BPSU (Fig. SU3 is characterized by low to moder- ate amplitude, westward-prograding clinoformal reflections that downlap the BPFS but do not onlap topography associated with the depression features developed along this horizon (Figs lb and 3a). The distribution and geometry of these features can be observed on a time structure map which has a compressed colour-scale to accentuate the features, and three-dimensional visualization of the BPFS indicates that the depressions occur Seismic Unit 3 (SU3) is bound above and below by the BPFS and BPSU respectively and corresponds to the Pliocene age seismic package CSS-7 of Jordt et al. of the BPFS bounding the top of the SU2 indicates the development of a series of sub-circular depressions, 3-6km in diameter and 23-58m deep (Fig. These surveys are owned 100% by BP Exploration Alaska unless otherwise noted.įor more information on the 3D surveys and pricing contact us: 907.272.1232. We can help you acquire this data in "load-ready" condition to upload to your geoscience interpretation platform and also provide QC'ed and fully organized datasets at a discounted price.Ī total of 650 square miles of brokered BP 3D seismic data is available from Petrotechnical Resources of Alaska, LLC (PRA). Tax Credit Seismic Survey for Public Releaseīelow are a series of newly released 2D and 3D seisimic datsets that have been publicly released by the state of Alaska through the Alternative Credit for Oil and Gas Exploration (AS 43.55.025) and Tax Credit for Certain Losses and Expenditures (AS 43.55.023).Įach survey is made up of three sections: Poststack Data, Prestack Data and Support Data. On Top Shublik highlighting complex faulting
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